Voters in Denver gave the thumbs up to a new sustainability initiative for the city that requires new buildings exceeding 25,000 sq. ft. and residential buildings over four stories high and greater than 25,000 sq. ft. to have a portion of their roofs covered by a “green, vegetative space.” Existing buildings would have to add “green” features upon reroofing. Denver joins Chicago, San Francisco, and Toronto with similar green roof requirements.
Also known as Ordinance 300, the initiative passed with 54% of the vote in November and went into effect on January 1. It was spearheaded in early 2017 by a grassroots volunteer group with a goal of reducing air pollution and energy costs. Proponents claim green roofs will last longer and cost less in the long run.
Most of the language for the new ordinance was adapted from Toronto’s Green Roof Bylaw, which was the first of its kinds in North America and has been in place since 2009.
— Boulder Weekly and Denvergreenroof.org