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HA City,/ <br />Om Louisville <br />COLORADO • SINCE 1878 <br />DRAFT RESIDENTIAL AMENDMENTS FOR 2024 IECC ADOPTION <br />Version: Explanatory Version 1.2 DRAFT <br />Version Date: April 17, 2025 <br />About This File: This document contains the regionally -aligned amendments to <br />the 2024 International Energy Conservation Code — Residential Chapter. This is <br />the "Explanatory" version which includes short notes and tags about each <br />amendment as well as tracked changes (strikeouts and underlines) showing what <br />changed from the base code. <br />Cohort Background and Goals: The 2024-2025 Metro Regional Building Policy <br />Cohort (the "code cohort") is an extension and expansion of a previous <br />successful cohort effort. Goals of the cohort are to collaboratively review and <br />adopt the most recent energy code — the 2024 International Energy Conservation <br />Code (IECC) — along with regionally -aligned and consistent supporting <br />amendments. Primary outcomes include reducing energy use and climate <br />emissions in the built environment while balancing affordability and equity; <br />improving region -wide consistency for builders, developers, and contractors; <br />emphasizing flexibility without sacrificing performance; streamlining workload for <br />budget -constrained building departments; and allowing for adjustments in each <br />community while maintaining overall general alignment. Primary participating <br />communities include Boulder County, City of Boulder, Brighton, Broomfield, <br />Berthoud, Edgewater, Erie, Golden, Lafayette, Longmont, Louisville, Northglenn, <br />Superior, Thornton, and Westminster. The code cohort is expanding to the <br />remainder of the Denver metro area communities in 2025. The code cohort is <br />jointly led and supported by participating local governments, with facilitation and <br />code expertise from Lotus Engineering and Sustainability, the Southwest Energy <br />Efficiency Project (with support from the U.S. Department of Energy), and Shums <br />Coda (with support from Xcel Energy). Funding is provided by participating local <br />governments and by the federal government through a Climate Pollution <br />Reduction Grant (CPRG) to the Denver Regional Council of Governments <br />(DRCOG) for the Decarbonize DRCOG project. <br />Source Materials and Terminology: These amendments are for the 2024 <br />International Energy Conservation Code, first printing, as published by the <br />International Code Council. Most of the amendments are from the Low Energy <br />and Carbon Code developed by the Colorado Energy Code Board (in draft form <br />as of April 2025, and unofficially denoted here as "LECC"), unless otherwise <br />noted. It also incorporates agreed -upon principles and frameworks from each of <br />the participating cohort communities (denoted here as "Cohort"), and pulls <br />several additional amendments from the previous 2021 IECC code cohort. Minor <br />amendments are from the Model Green Code developed by the Colorado Energy <br />Office (in draft form as of Feb 2025, and denoted here as "Green"). Other <br />