Specialty Class D Certificates

Scope of Work

Antennas attached to buildings or freestanding, including antenna towers. Not allowed to alter any structural members of a building. All work to be done under the on-site supervision of a Class D Antenna Installer Supervisor Certificate holder. 

Minimum Experience Required to Apply

• Two (2) years of field experience in the respective trade.
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience.

Testing

No test required.

Scope of Work

Building Insulation. All work to be done under the on-site supervision of a Class D Building Insulation Supervisor Certificate holder.

Minimum Experience Required to Apply

• Two (2) years of field experience in the respective trade.
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience.

Testing

No test required.

Scope of Work

Combined excavating, shoring, piles, caissons and drilled shafts and cast-in-place concrete, including the placement of reinforcing steel, bar supports and welded wire fabric for reinforced concrete construction. All work to be done under the on-site supervision of a Class D Concrete and Foundations Supervisor Certificate holder.

Minimum Experience Required to Apply

• Two (2) years of field experience in the respective trade. Please Include documentation for both flatwork & foundation experience.
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience.

Testing

No test required.

Scope of Work

Placement of reinforcing bars, pre or post tensioning steel, bar supports and welded wire fabric for reinforced concrete construction. All work to be done under on-site the supervision of a Class D Concrete Reinforcing Steel Placers Supervisor Certificate holder.

Minimum Experience Required to Apply

• Two (2) years of field experience in the respective trade.
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience. 

Testing

No test required.

Scope of Work

Installation of curtain walls and storefronts. All work to be done under the on-site supervision of a Class D Curtain Walls Supervisor Certificate holder.

Minimum Experience Required to Apply

• Two (2) years of field experience in the respective trade.
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience.

Testing

No test required.

Scope of Work

Work limited to town houses, one and two family dwelling unit buildings not requiring any structural alterations. This certificate is only required if the work is being done in a landmark district. All work to be done under the on-site supervision of a Class D Custom Size Window Replacement Supervisor Certificate holder.

Note: The installation of curtain walls, glass block, or storefronts and the replacement and installation of windows in commercial buildings is not allowed under this license.

Minimum Experience Required to Apply

• Two (2) years of field experience in the respective trade.
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience.

Testing 

No test required.

The online certificate application will require you to upload notarized letters of experience that document how you meet the minimum experience needed for that certificate type. These letters must come from owners or officers of current or previous employers, or clients that have hired you to do work. If you are the owner of the company, you must go to previous employers or clients that you have done work for as you cannot be your own reference.

Notarized letters should be in the following format:

• Original notarized letters. These can be scanned and uploaded if applying online.

• If a company is verifying your experience, the letter should be typed on company letterhead.

• List exact duties, projects performed, and equipment operated.

• List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last fifteen (15) years. Use the following format:
  Start Date:  MM/YY, End Date:  MM/YY.

• List the address for each project mentioned. 

• Include letters from previous or present employers or customers who have hired you to do the type of work covered by that certificate. 

• Do not submit letters from other officers / members of your company or subcontractors.

• Submit as many notarized letters as needed to document the minimum experience requirements for the certificate you are applying for.

• Retain copies of your application and notarized letters. The Contractor Licensing office will not be able to make additional copies for you.

If your certificate application is approved, you will have 90 days to procure your certificate by submitting the official ICC pass letter. This is only necessary for certificates that require proof of passing an ICC examination. 

Once your application is submitted online or in person, it will take approximately 14-20 business days to be reviewed. You will receive an approval or denial email once the application has been reviewed, and you will then be able to return to the online application to pay for the certificate.

Mail-in applications will take approximately 14-20 business days to be reviewed once we receive your application. Do not submit payment with your application. You will be notified by telephone of application approval or rejection. (Please note that the Contractor License office can only give application status to the actual applicant.)

If your online or mail-in application is approved, you will have 90 days to procure your certificate by paying the appropriate fee amount. Supervisor certificates must be renewed every three years.

• View certificate/license fee amounts

• Please return to your online certificate application to pay fees.

If your application is not approved you will have the opportunity to apply a second time. Additional documentation is required. 

If the application is not approved the second time, there is a six-month waiting period before applicants can re-apply for the same certificate type.

Scope of Work

This certificate is required for a Sewer Contractor License if the company does not employ a State of Colorado licensed Master Plumber.

Minimum Experience Required to Apply

• Applicant must have a minimum of two years of drain laying field experience under the supervision of a State of Colorado licensed Master Plumber or Denver Certified Drain layer Supervisor.
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience.

Testing

No test required.

Scope of Work

Installation of all drywall.

Minimum Experience Required to Apply

• Two (2) years of field experience in the respective trade
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience. 

Testing

No test required.

Scope of Work

Installation of fence structures. All work to be done under the on-site supervision of a Class D Fence Structures Supervisor Certificate holder.

Minimum Experience Required to Apply

• Two (2) years of field experience in the respective trade. 
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience. 

Testing

No test required.

Scope of Work

Installation of fire doors. All work to be done under the on-site supervision of a Class D Fire Door Installer Supervisor Certificate holder.

Minimum Experience Required to Apply

• Two (2) years of field experience in the respective trade.
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience.

Testing

No test required.

Additional Requirement

Licenses issued by the Denver Fire Department (DFD) are required for the design, installation, modification, inspection, and testing of all life safety and conveyance systems and equipment.

Apply for a DFD license

Scope of Work

Application of fireproofing materials. All work to be done under the on-site supervision of a Class D Fireproofing Supervisor Certificate holder.

Minimum Experience Required to Apply

• Two (2) years of field experience in the respective trade.
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience.

Testing

No test required.

Additional Requirement

Licenses issued by the Denver Fire Department (DFD) are required for the design, installation, modification, inspection, and testing of all life safety and conveyance systems and equipment. 

Apply for a DFD license

Scope of Work

Special Inspection of firestop systems, fire-resistive joint systems, and perimeter fire containment systems. All work will be done under the on-site supervision of a Class D Firestop Inspector – Commercial Supervisor Certificate holder. See Firestop Special Inspections and Contractor Licensure policy(PDF, 173KB) for more information.

Minimum Experience Required to Apply

• Special inspectors who perform the special inspections shall fulfill the qualification requirements associated with obtaining a Specialty Class D Firestop Installer Supervisor Certificate and, either 1 or 2 below when performing inspections on or after January 6, 2025.
• 1. Possess a current ICC Firestopping Credential of Learning Achievement (CLA)
  2. Examination:
  • Firestop Industry Examination—Score a minimum of 80% on an examination containing subject matter directly related to the firestop industry and to inspections conducted under the scopes of ASTM Practices E2174 and E2393. Organizations and programs that provide firestop industry examinations include, but are not limited to, the following:
  • IAS Certificate of Accreditation for Firestop Systems based on AC 291, Accreditation Criteria for Special Inspection Agencies.
  • IFC Recommended Training and Education for Third-Party Firestop Inspectors program.
  • Firestop installer programs such as the FM 4991 DRI program.
  • UL Qualified Firestop Contractor Program.
  • Equivalent alternative Firestop Industry Examinations as approved by the Agency.

Testing

See Firestop Special Inspections and Contractor Licensure policy(PDF, 173KB) for more information.

Scope of Work

Installation and repair of firestop systems, fire-resistive joint systems, and perimeter fire containment systems.  All work will be done under the on-site supervision of a Class D Firestop Installer – Commercial Supervisor Certificate holder. 

Minimum Experience Required to Apply

•  A Specialty Class D Firestopping Installer Certificate is required for the installation of all firestopping. The supervision by a Firestopping Supervisor is required in buildings subject to the special inspection requirements of 2021 IBC Section 1705.18. This certificate will be valid for 3 years from date of issue. The required experience and training for the individual applying for the installer certificate:

1. Minimum Experience: Comply with one of the following (A, B, or C),

A) One year experience or 1,000 hours documented experience in building construction within the firestop industry, installing firestopping under the direction of a supervisor holding a Denver firestopping supervisor certificate or an approved Denver firestopping special inspector certificate.

 B) One year or 1,000 hours documented experience in the firestop industry conducting quality control under the direction of a supervisor holding a Denver firestopping supervisor certificate or an approved Denver firestopping special inspector certificate.

 C) One year or 1500 hours documented experience in the selection and installation of firestop systems and/or fire-resistive joint systems under the direction of a supervisor holding a Denver firestopping supervisor certificate or an approved Denver firestopping special inspector certificate.

 2. Minimum Training: Within the past two years must, comply with one of the following (A or B)

 A) Attend a total of eight hours of educational training directly related to firestopping and conducted by at least three different organizations comprised of firestop manufacturers, firestop industry trade associations, Accredited CEU providers or a combination thereof. A minimum of two hours per each organization is required.

 B) Attend a minimum eight-hour ICC or other accredited educational program with the explicit purpose of educating parties specifically in the firestop industry. This option will be evaluated on a case-by-case basis depending on the educational program submitted to the AHJ for consideration by the applicant. 

Testing

See Firestop Special Inspections and Contractor Licensure policy(PDF, 173KB) for more information.

Firestopping Supervisor Minimum Qualifications

To ensure compliance with accreditation requirements, Firestopping Installers shall have effective supervision by one or more Firestopping Supervisors. A Specialty Class D Firestopping Supervisor’s Certificate is required for the supervision of firestopping installation in buildings subject to the special inspection requirements of 2021 IBC Section 1705.18. This certificate will be valid for 3 years from date of issue.

1. Minimum Experience: Comply with one of the following (A, B, C, or D),
   1. Two-years' documented experience or 2,000 hours in building construction within the firestop industry conducting inspections under the direction of a supervisor holding a Denver firestopping supervisor certificate or an approved firestopping special inspector certificate.
   2. Two years or 2,000 hours documented experience in the firestop industry conducting quality control under the direction of a supervisor holding a Denver firestopping supervisor certificate or an approved Denver firestopping special inspector certificate.
   3. Two years or 3,000 hours documented experience in the selection and installation of firestop systems and/or fire-resistive joint systems under the direction of a supervisor holding a Denver firestopping supervisor certificate or an approved Denver firestopping special inspector certificate.
   4. Hold license as a Colorado registered design professional with a minimum two years or 2,000 hours documented experience in the firestop industry.
2. Minimum Training: Within the past two years must, comply with the following (A and B)
   1. Attend a total of eight hours of educational training directly related to firestopping and conducted by at least three different organizations comprised of firestop manufacturers, firestop industry trade associations, Accredited CEU providers or a combination thereof. A minimum of two hours per each organization is required.

See Firestop Special Inspections and Contractor Licensure policy(PDF, 173KB) for more information.

Scope of Work

Construction of handicap accessible ramps only. All work to be done under the on-site supervision of a Class D Handicap Accessible Ramp Installer Supervisor Certificate holder.

Minimum Experience Required to Apply

• Two (2) years of field experience in the respective trade.
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience. 

Testing

No test required.

Scope of Work

Construction of High Piled Storage Racks. All work to be done under the on-site supervision of a Class D High Piled Storage Supervisor Certificate holder.

Minimum Experience Required to Apply

• Two (2) years of field experience in the respective trade.
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience.

Testing

No test required.

The online certificate application will require you to upload notarized letters of experience that document how you meet the minimum experience needed for that certificate type. These letters must come from owners or officers of current or previous employers, or clients that have hired you to do work. If you are the owner of the company, you must go to previous employers or clients that you have done work for as you cannot be your own reference.

Notarized letters should be in the following format:

• Original notarized letters. These can be scanned and uploaded if applying online.

• If a company is verifying your experience, the letter should be typed on company letterhead.

• List exact duties, projects performed, and equipment operated.

• List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last fifteen (15) years. Use the following format:
  Start Date:  MM/YY, End Date:  MM/YY.

• List the address for each project mentioned. 

• Include letters from previous or present employers or customers who have hired you to do the type of work covered by that certificate. 

• Do not submit letters from other officers / members of your company or subcontractors.

• Submit as many notarized letters as needed to document the minimum experience requirements for the certificate you are applying for.

• Retain copies of your application and notarized letters. The Contractor Licensing office will not be able to make additional copies for you.

If your certificate application is approved, you will have 90 days to procure your certificate by submitting the official ICC pass letter. This is only necessary for certificates that require proof of passing an ICC examination. 

Once your application is submitted online or in person, it will take approximately 14-20 business days to be reviewed. You will receive an approval or denial email once the application has been reviewed, and you will then be able to return to the online application to pay for the certificate.

Mail-in applications will take approximately 14-20 business days to be reviewed once we receive your application. Do not submit payment with your application. You will be notified by telephone of application approval or rejection. (Please note that the Contractor License office can only give application status to the actual applicant.)

If your online or mail-in application is approved, you will have 90 days to procure your certificate by paying the appropriate fee amount. Supervisor certificates must be renewed every three years.

• View certificate/license fee amounts

• Please return to your online certificate application to pay fees.

If your application is not approved you will have the opportunity to apply a second time. Additional documentation is required. 

If the application is not approved the second time, there is a six-month waiting period before applicants can re-apply for the same certificate type.

Scope of Work

Contractors are only allowed to do this type of work for single family and duplex residences. All work to be done under the on-site supervision of a Class D Inside Tap and Backflow Preventer Supervisor Certificate holder.

Minimum Experience Required to Apply

• Two (2) years of field experience in the respective trade.
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience.

Testing

No test required.

Scope of Work

Installation of all lathing and plastering, including non-bearing partitions and exterior stucco or exterior texturing of buildings or structures.

Minimum Experience Required to Apply

• Two (2) years of field experience in the respective trade.
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience.

Testing

No test required.

Scope of Work

Installation of all lathing, plastering and drywall including the installation of nonbearing partitions, stucco or exterior texturing of buildings or structures. Only allows this type of work for single-family and duplex residences. All work to be done under the on-site supervision of a Class D Supervisor Certificate holder. 

Minimum Experience Required to Apply

• Two (2) years of field experience in the respective trade.
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience.

Testing

No test required.

Scope of Work

Installation of landscape irrigation connected to a graywater treatment works system or for green roof vegetation only. Does not allow for installation or repair of an inside tap and backflow preventer. Green roof irrigation cannot be connected to a graywater treatment works system.

Minimum Experience Required to Apply

• Two (2) years of field experience in the respective trade. 
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience.

Testing

No test required.

Scope of Work

Laying and forming all types of masonry. All work to be done under the on-site supervision of a Class D Mason Supervisor Certificate holder.

Minimum Experience Required to Apply

• Two (2) years of field experience in the respective trade.
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience.

Testing

No test required.

Scope of Work

Installation of material handling equipment. All work to be done under on-site supervision of a Class D Material Handling Equipment Installer Supervisor Certificate holder.

Minimum Experience Required to Apply

• Two (2) years of field experience in the respective trade.
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience.

Testing

No test required.

Scope of Work

Installation of metal roofs only. All work to be done under the on-site supervision of a Class D Metal Roof Installer Supervisor Certificate holder.

Minimum Experience Required to Apply

• Two (2) years of field experience in the respective trade. 
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience.

Testing

No test required.

The online certificate application will require you to upload notarized letters of experience that document how you meet the minimum experience needed for that certificate type. These letters must come from owners or officers of current or previous employers, or clients that have hired you to do work. If you are the owner of the company, you must go to previous employers or clients that you have done work for as you cannot be your own reference.

Notarized letters should be in the following format:

• Original notarized letters. These can be scanned and uploaded if applying online.

• If a company is verifying your experience, the letter should be typed on company letterhead.

• List exact duties, projects performed, and equipment operated.

• List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last fifteen (15) years. Use the following format:
  Start Date:  MM/YY, End Date:  MM/YY.

• List the address for each project mentioned. 

• Include letters from previous or present employers or customers who have hired you to do the type of work covered by that certificate. 

• Do not submit letters from other officers / members of your company or subcontractors.

• Submit as many notarized letters as needed to document the minimum experience requirements for the certificate you are applying for.

• Retain copies of your application and notarized letters. The Contractor Licensing office will not be able to make additional copies for you.

If your certificate application is approved, you will have 90 days to procure your certificate by submitting the official ICC pass letter. This is only necessary for certificates that require proof of passing an ICC examination. 

Once your application is submitted online or in person, it will take approximately 14-20 business days to be reviewed. You will receive an approval or denial email once the application has been reviewed, and you will then be able to return to the online application to pay for the certificate.

Mail-in applications will take approximately 14-20 business days to be reviewed once we receive your application. Do not submit payment with your application. You will be notified by telephone of application approval or rejection. (Please note that the Contractor License office can only give application status to the actual applicant.)

If your online or mail-in application is approved, you will have 90 days to procure your certificate by paying the appropriate fee amount. Supervisor certificates must be renewed every three years.

• View certificate/license fee amounts

• Please return to your online certificate application to pay fees.

If your application is not approved you will have the opportunity to apply a second time. Additional documentation is required. 

If the application is not approved the second time, there is a six-month waiting period before applicants can re-apply for the same certificate type.

Scope of Work

This is for single-family, duplex, or IRC townhome properties for NON-BEARING and NON-STRUCTURAL WORK ONLY and does not allow the alteration or installation of load-bearing or structural elements.

Minimum Experience Required to Apply

• Two (2) years of field experience in framing, insulation, and drywall in residential properties.
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience.

Testing

No test required.

Scope of Work

Including supporting foundation and attachment to buildings. This license allows construction of open roof structure and NOT shade devices or closed roof structures. Work to be done only on single-family and duplex dwellings.

Minimum Experience Required to Apply

• Two (2) years of field experience in the respective trade.
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience.

Testing

No test required.

Scope of Work

Erection of outdoor stages, mobile stages, platforms for reviewing stands.

Minimum Experience Required to Apply

• Two (2) years of field experience in the respective trade.
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience.

Testing

No test required.

Scope of Work

Installation of overhead doors. All work to be done under the on-site supervision of a Class D Overhead Door Installer Supervisor Certificate holder.

Minimum Experience Required to Apply

• Two (2) years of field experience in the respective trade.
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience.

Testing

No test required.

Scope of Work

Installation of power operated doors. All work to be done under the on-site supervision of a Class D Power Operated Door Installers Supervisor Certificate holder.

Minimum Experience Required to Apply

• Two (2) years of field experience in the respective trade.
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience.

Testing

No test required.

Scope of Work

The erection of pre-cast concrete structural units. All work to be done under the on-site supervision of a Class D Pre-Cast Concrete Building Units Supervisor Certificate holder.

Minimum Experience Required to Apply

• Two (2) years of field experience in the respective trade. 
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience.

Testing

No test required.

Scope of Work

Installation of prefabricated patios, carports, canopies, and awning only. All work to be done under the on-site supervision of a Class D Prefabricated Patios, Carports, Canopies and Awnings Supervisor Certificate holder.

Minimum Experience Required to Apply

• Two (2) years of field experience in the respective trade. 
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience.

Testing

No test required.

Scope of Work

Installation of prefabricated patios, carports, canopies, and awnings into foundations. Installation of foundations including combined excavating, shoring, piles, caissons and drilled shafts and cast-in-place concrete, including the placement of reinforcing steel, bar supports and welded wire fabric for reinforced concrete construction. All work to be done under the on-site supervision of a Class D Prefabricated Patios, Carports, Canopies and Awnings with Foundations Supervisor Certificate holder.

Minimum Experience Required to Apply

• Two (2) years of field experience in the respective trade. Please Include documentation for both flatwork & foundation experience.
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience.

Testing

No test required.

The online certificate application will require you to upload notarized letters of experience that document how you meet the minimum experience needed for that certificate type. These letters must come from owners or officers of current or previous employers, or clients that have hired you to do work. If you are the owner of the company, you must go to previous employers or clients that you have done work for as you cannot be your own reference.

Notarized letters should be in the following format:

• Original notarized letters. These can be scanned and uploaded if applying online.

• If a company is verifying your experience, the letter should be typed on company letterhead.

• List exact duties, projects performed, and equipment operated.

• List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last fifteen (15) years. Use the following format:
  Start Date:  MM/YY, End Date:  MM/YY.

• List the address for each project mentioned. 

• Include letters from previous or present employers or customers who have hired you to do the type of work covered by that certificate. 

• Do not submit letters from other officers / members of your company or subcontractors.

• Submit as many notarized letters as needed to document the minimum experience requirements for the certificate you are applying for.

• Retain copies of your application and notarized letters. The Contractor Licensing office will not be able to make additional copies for you.

If your certificate application is approved, you will have 90 days to procure your certificate by submitting the official ICC pass letter. This is only necessary for certificates that require proof of passing an ICC examination. 

Once your application is submitted online or in person, it will take approximately 14-20 business days to be reviewed. You will receive an approval or denial email once the application has been reviewed, and you will then be able to return to the online application to pay for the certificate.

Mail-in applications will take approximately 14-20 business days to be reviewed once we receive your application. Do not submit payment with your application. You will be notified by telephone of application approval or rejection. (Please note that the Contractor License office can only give application status to the actual applicant.)

If your online or mail-in application is approved, you will have 90 days to procure your certificate by paying the appropriate fee amount. Supervisor certificates must be renewed every three years.

• View certificate/license fee amounts

• Please return to your online certificate application to pay fees.

If your application is not approved you will have the opportunity to apply a second time. Additional documentation is required. 

If the application is not approved the second time, there is a six-month waiting period before applicants can re-apply for the same certificate type.

Scope of Work

Installation of retaining walls. All work to be done under on-site supervision of a Class D Retaining Walls Supervisor Certificate holder.   

Minimum Experience Required to Apply 

• Two (2) years of field experience in the respective trade.
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience.

Testing

No test required.

Scope of Work

Installation of commercial and residential roof coverings, including valleys, gutters, downspouts and waterproofing. All work to be done under the on-site supervision of a Class D Roof Covering and Waterproofing Supervisor Certificate holder.

Minimum Experience Required to Apply

• Two (2) years of field experience in the respective trade. Requires experience in all aspects of residential and commercial roofing systems. You must provide a minimum of 24 projects from 24 different months to document the two years of field experience. At least 75% of the installation projects must be different types of low-slope roof systems on commercial buildings. 
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address, type of roof built, and the slope of the roof built for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience.

Testing

No test required.

Scope of Work

Installation of landscaped rooftop vegetation systems only. 

Minimum Experience Required to Apply

• Two (2) years of field experience in the respective trade. Field experience in installation of landscaped rooftop vegetation systems is required. A B.S. or B.A. degree in landscape architecture from an accredited college may be substituted for up to one (1) year of the required field work. A copy of the degree must be submitted.
• A current Green Roof Professional (GRP) accreditation from greenroofs.org may be accepted in lieu of notarized letters. A copy of the current accreditation must be submitted at initial application and upon renewal.  
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience.
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience. 

Testing

No test required.

Scope of Work

Installation of residential only roofing systems.  All work to be done under the on-site supervision of a Class D Roofing-Shingles Only Supervisor Certificate holder.

Minimum Experience Required to Apply

• Two (2) years of field experience in the respective trade. Requires experience in all aspects of residential roofing systems. You must provide a minimum of 24 projects from 24 different months to document the two years of field experience.
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience.

Testing

Not test required.

The online certificate application will require you to upload notarized letters of experience that document how you meet the minimum experience needed for that certificate type. These letters must come from owners or officers of current or previous employers, or clients that have hired you to do work. If you are the owner of the company, you must go to previous employers or clients that you have done work for as you cannot be your own reference.

Notarized letters should be in the following format:

• Original notarized letters. These can be scanned and uploaded if applying online.

• If a company is verifying your experience, the letter should be typed on company letterhead.

• List exact duties, projects performed, and equipment operated.

• List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last fifteen (15) years. Use the following format:
  Start Date:  MM/YY, End Date:  MM/YY.

• List the address for each project mentioned. 

• Include letters from previous or present employers or customers who have hired you to do the type of work covered by that certificate. 

• Do not submit letters from other officers / members of your company or subcontractors.

• Submit as many notarized letters as needed to document the minimum experience requirements for the certificate you are applying for.

• Retain copies of your application and notarized letters. The Contractor Licensing office will not be able to make additional copies for you.

If your certificate application is approved, you will have 90 days to procure your certificate by submitting the official ICC pass letter. This is only necessary for certificates that require proof of passing an ICC examination. 

Once your application is submitted online or in person, it will take approximately 14-20 business days to be reviewed. You will receive an approval or denial email once the application has been reviewed, and you will then be able to return to the online application to pay for the certificate.

Mail-in applications will take approximately 14-20 business days to be reviewed once we receive your application. Do not submit payment with your application. You will be notified by telephone of application approval or rejection. (Please note that the Contractor License office can only give application status to the actual applicant.)

If your online or mail-in application is approved, you will have 90 days to procure your certificate by paying the appropriate fee amount. Supervisor certificates must be renewed every three years.

• View certificate/license fee amounts

• Please return to your online certificate application to pay fees.

If your application is not approved you will have the opportunity to apply a second time. Additional documentation is required. 

If the application is not approved the second time, there is a six-month waiting period before applicants can re-apply for the same certificate type.

Scope of Work

Erection of Scaffolding. All work to be done under the on-site supervision of a Class D Scaffold Erection Supervisor Certificate holder. 

Minimum Experience Required to Apply

• Two (2) years of field experience in the respective trade.
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience.

Testing

No test required. 

Scope of Work

Installation of security bars, grills and grates. All work to be done under the on-site supervision of a Class D Security Bars, Grills, & Grates Supervisor Certificate holder.

Minimum Experience Required to Apply

• Two (2) years of field experience in the respective trade.
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience.

Testing

No test required.

Scope of Work

Installation of siding, gutters and downspouts. All work to be done under the on-site supervision of a Class D Siding Supervisor Certificate holder. 

Minimum Experience Required to Apply

• Two (2) years of field experience in the respective trade.
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience.

Testing

No test required.

Scope of Work

Wall and ground signs not exceeding 200 square feet or exceeding 10 feet in height. 

Minimum Experience Required to Apply

• Two (2) years of field experience in the respective trade. 
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience.

Testing

No test required.

Scope of Work

To, install, erect or maintain all types of signs unless exempt by Section 130.3.

Minimum Experience Required to Apply

• Five (5) years of experience in the sign industry in the erection and sheet metal phases for all types of signs, including signs over 200 square feet in size and over 10 feet in height.
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience for each project.
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience.

Testing  

No test required.

Scope of Work

Fabrication and erection of structural metal members for all buildings or structures. All work to be done under the on-site supervision of a Class D Structural metals Supervisor Certificate holder.

Minimum Experience Required to Apply

• Two (2) years of field experience in the respective trade.
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience.

Testing

No test required.

Scope of Work

Installation of swimming pools as required by the Denver Building Code. All work to be done under the on-site supervision of a Class D Swimming Pools Supervisor Certificate holder.

Minimum Experience Required to Apply 

• Two (2) years of field experience in the respective trade.
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience.

Testing

No test required.

The online certificate application will require you to upload notarized letters of experience that document how you meet the minimum experience needed for that certificate type. These letters must come from owners or officers of current or previous employers, or clients that have hired you to do work. If you are the owner of the company, you must go to previous employers or clients that you have done work for as you cannot be your own reference.

Notarized letters should be in the following format:

• Original notarized letters. These can be scanned and uploaded if applying online.

• If a company is verifying your experience, the letter should be typed on company letterhead.

• List exact duties, projects performed, and equipment operated.

• List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last fifteen (15) years. Use the following format:
  Start Date:  MM/YY, End Date:  MM/YY.

• List the address for each project mentioned. 

• Include letters from previous or present employers or customers who have hired you to do the type of work covered by that certificate. 

• Do not submit letters from other officers / members of your company or subcontractors.

• Submit as many notarized letters as needed to document the minimum experience requirements for the certificate you are applying for.

• Retain copies of your application and notarized letters. The Contractor Licensing office will not be able to make additional copies for you.

If your certificate application is approved, you will have 90 days to procure your certificate by submitting the official ICC pass letter. This is only necessary for certificates that require proof of passing an ICC examination. 

Once your application is submitted online or in person, it will take approximately 14-20 business days to be reviewed. You will receive an approval or denial email once the application has been reviewed, and you will then be able to return to the online application to pay for the certificate.

Mail-in applications will take approximately 14-20 business days to be reviewed once we receive your application. Do not submit payment with your application. You will be notified by telephone of application approval or rejection. (Please note that the Contractor License office can only give application status to the actual applicant.)

If your online or mail-in application is approved, you will have 90 days to procure your certificate by paying the appropriate fee amount. Supervisor certificates must be renewed every three years.

• View certificate/license fee amounts

• Please return to your online certificate application to pay fees.

If your application is not approved you will have the opportunity to apply a second time. Additional documentation is required. 

If the application is not approved the second time, there is a six-month waiting period before applicants can re-apply for the same certificate type.

Scope of Work

Allows the setting up of temporary office buildings. All work to be done under the on-site supervision of a Class D Mobile Building Installer Supervisor Certificate holder.

Minimum Experience Required to Apply

• Two (2) years of field experience in the respective trade.
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience.

Testing

No test required.

Scope of Work

Interior nonbearing and nonstructural work only. Does not allow the alteration or installation of load-bearing or structural elements. All work to be done under the on-site supervision of a Class D Tenant Finish – Commercial Supervisor Certificate holder. 

Minimum Experience Required to Apply

• Requires four (4) years of field experience in commercial tenant finish work. Experience must include:
  • Type of Tenant finish work done in a retail establishment, and or office, etc. (I.e. drywall, framing, suspended acoustical ceilings, fire rated wall(s).
  • Names or type of commercial building in which tenant finish work was performed and dates work was started and completed.

• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience.

Testing

Test not required.

Scope of Work

Waterproofing and Damp proofing. All work to be done under the on-site supervision of a Class D Waterproofing/Damp proofing Supervisor Certificate holder.

Minimum Experience Required to Apply

• Two (2) years of field experience in the respective trade.
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience.

Testing

No test required.

Scope of Work

To install or repair service lines and appurtenances from the corporation cock on the main up to and including:

• the first valve downstream of the meter, for an inside meter setting; or
• the first valve inside the structure, for an outside meter setting. 

This license shall not permit the installation of the water meter. All work shall be done under the on-site supervision of a Water Service Supervisor Certificate holder, or a State of Colorado Master Plumbers License.

Minimum Experience Required to Apply

• Requires two (2) years of field experience. A State of Colorado Division of Fire Safety "Registered Underground Fire Line Contractor" certificate or a Denver Class D drain layer supervisor certificate may be accepted in lieu of notarized letters.
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience.

Testing

No test required.

Scope of Work

The fabrication and erection of wood framing for all types of buildings. All work to be done under the on-site supervision of a Class D Wood Framing Supervisor Certificate holder.

Minimum Experience Required to Apply

• Two (2) years of field experience in the respective trade.
• Notarized letter(s) must show WHAT, WHEN AND WHERE you gained the necessary experience. 
  • List exact scope of work, duties, projects performed, and equipment operated by the individual applying for the certificate.
  • List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last ten (10) years.
  • List the address for each project mentioned.
  • List as many projects needed in order to cover the required amount of experience.

Testing

No test required.

The online certificate application will require you to upload notarized letters of experience that document how you meet the minimum experience needed for that certificate type. These letters must come from owners or officers of current or previous employers, or clients that have hired you to do work. If you are the owner of the company, you must go to previous employers or clients that you have done work for as you cannot be your own reference.

Notarized letters should be in the following format:

• Original notarized letters. These can be scanned and uploaded if applying online.

• If a company is verifying your experience, the letter should be typed on company letterhead.

• List exact duties, projects performed, and equipment operated.

• List exact start and end dates (month and year) of construction work only for each project. Projects should have been completed within the last fifteen (15) years. Use the following format:
  Start Date:  MM/YY, End Date:  MM/YY.

• List the address for each project mentioned. 

• Include letters from previous or present employers or customers who have hired you to do the type of work covered by that certificate. 

• Do not submit letters from other officers / members of your company or subcontractors.

• Submit as many notarized letters as needed to document the minimum experience requirements for the certificate you are applying for.

• Retain copies of your application and notarized letters. The Contractor Licensing office will not be able to make additional copies for you.

If your certificate application is approved, you will have 90 days to procure your certificate by submitting the official ICC pass letter. This is only necessary for certificates that require proof of passing an ICC examination. 

Once your application is submitted online or in person, it will take approximately 14-20 business days to be reviewed. You will receive an approval or denial email once the application has been reviewed, and you will then be able to return to the online application to pay for the certificate.

Mail-in applications will take approximately 14-20 business days to be reviewed once we receive your application. Do not submit payment with your application. You will be notified by telephone of application approval or rejection. (Please note that the Contractor License office can only give application status to the actual applicant.)

If your online or mail-in application is approved, you will have 90 days to procure your certificate by paying the appropriate fee amount. Supervisor certificates must be renewed every three years.

• View certificate/license fee amounts

• Please return to your online certificate application to pay fees.

If your application is not approved you will have the opportunity to apply a second time. Additional documentation is required. 

If the application is not approved the second time, there is a six-month waiting period before applicants can re-apply for the same certificate type.