Colorado Building Energy Codes

Colorado is a home rule state, where building energy codes are adopted and enforced on a local level. A 2019 law requires all jurisdictions to adopt one of the three most recent versions of the International Energy Conservation Code (IECC), at a minimum, when they update any other building codes. Most of the high-construction areas of the state are on either the 2015 or 2018 IECC. Information on jurisdictional adoption is at the Colorado Department of Local Affairs, updated yearly.

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