Required: A second hand dealer must obtain a license in Denver. A second-hand dealer is defined as a person whose business is that of engaging in selling or trading secondhand property, or whose business is selling new goods, but who buys and sells secondhand articles, goods, wares or merchandise of the same type or class as the new goods sold. This does not include persons who sell items that were not originally purchased for resale for up to three weekends per year. This also does not include persons who sell at shows intended to display a particular product such as antiques, except for show for precious stones. It also does not include non-profit tax exempt organizations or auto part recyclers.
According to the Denver Revised Municipal Code, no person licensed as a secondhand dealer, during the period of the license, shall receive or hold a license or carry on the business of a pawnbroker, automobile parts recycler, or a junk dealer. Second hand dealers are required to keep extensive records and comply with requirements set out in Denver Revised Municipal Code Sec. 45-66.
"Second hand property" is defined in some length in Denver Revised Municipal Code Section 44-66(b) including such items as camera equipment, audio/visual items, jewelry, clothing, guns, ski equipment, bicycles, appliances, household goods, auto accessories, and electronic equipment.
Forms Required:

Please bring your valid Colorado identification.
Name check will be completed.
Inspections: Building, Fire, Zoning
Fees: Application: $200
License: $85
CBI Name Check: $6.85