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Photo of a green roofOn November 7, Denver voters passed Initiative 300, the Green Roof Initiative. The initiative took effect January 1, 2018 and applies to development projects that submit a site development plan on or after January 1, 2018. The requirements of the Green Roof Initiative apply to any new building with a gross floor area of 25,000 square feet or more or a building addition that causes the building to become 25,000 square feet or more, and any existing building over 25,000 square feet that is seeking to do a roof replacement.

A diverse task force of stakeholders from the building industry, green roof industry, solar industry, environmental groups, hotel and lodging, Arts and Venues, Denver Water, Denver Housing Authority, City Attorney’s Office, Xcel, business interests, Denver Department of Health and Environment, City Council, and others has been meeting since January to discuss any potential changes to the ordinance while honoring the intent of voters.

City Council, by city charter, may seek to make changes to any citizen-led initiative after six months from implementation. The Council Committee of the Whole for Green Roofs will discuss the initiative and recommendations from the Green Roofs Task Force. Any changes would need to pass with a super-majority of at least 9 councilmember votes.



The Green Roof Review Task Force mission is to develop recommended modifications, clarifications, and improvements to the green roof initiative through a collaborative, consensus-based process that honors the vote and the benefits that the ordinance would have achieved.

The Green Roof Review Task Force now has a working draft proposal available for public review and comment. At a high level, the task force believes the proposal is taking the ordinance in the right direction for Denver. While it is not members' ideal policy, it is a compromise that members believe is getting closer to something all can accept because it strengthens the benefits while reducing the costs. The group believes this approach will improve flexibility, allowing each owner of an existing large building and each new builder to find the most cost-effective ways to achieve the benefits outlined in the original ordinance.

Please let them know if you agree that, directionally, the proposal included here is an improvement upon the original ballot language, and help them get the details right. The proposal will be updated with additional technical clarifications on Tuesday, May 8.

How to comment:

Fill out our comment form! Commenting in the form helps staff to group comments by topic. Comments may also be sent via email to

Any comments received by noon on May 18 will be shared with the task force ahead of their meeting May 23. 

The comment period closes at noon on June 3. The remaining comments will be sent to the task force at that time.

Two public briefings and input sessions will be held:

  • Friday, May 11, 9:00 a.m. – 10:30 a.m. in the Wellington Webb Municipal Building, room 4.G.2
  • Monday, May 14, 9:00 a.m. – 10:30 a.m. in the Wellington Webb Municipal Building, room 1.B.6

The task force will meet two more times on May 23 and on June 7. Any changes to the initiative will require the support of two-thirds of City Council, or nine votes.

Background information:
On November 7, Denver voters passed the Green Roof Initiative, a new requirement that any new building, or roof replacement on an existing building, over 25,000 square feet in size shall include a green roof or a combination of a green roof and solar. The Denver Department of Public Health and Environment (DDPHE) has formed a Green Roofs Review Task Force of stakeholders to develop recommended modifications, clarifications, and improvements to the initiative through a collaborative, consensus-based process that will honor the intent of the voters.

For details on the implementation of the initiative as it passed on the ballot go to the Green Roof Initiative Website.


The first meeting will be April 2 from 1:30 to 3:30 p.m. in Room 391 of the City and County Building.

The Special Issues: Green Roofs Initiative is scheduled to meet Monday, May 7 at 1:30 p.m.



Jolon Clark — Co-chair
Mary Beth Susman— Co-chair
Kendra Black
Albus Brooks
Rafael Espinoza
Kevin Flynn
Stacie Gilmore
Christopher Herndon
Paul Kashmann
Robin Kniech
Paul López
Wayne New
Deborah Ortega