Colorado municipalities that adopted, committed to adopt, or are in the process of adopting the 2021 IECC.
Municipality | Front Range Location | Previous Code | In Discussion, Planned, or Adopted | Planned or Actual Adoption Date | Implementation Date |
Arapahoe County | Denver Metro | 2009 IECC | Adopted | November 23 2021 | April 1 2022 |
City of Aurora | Denver Metro | 2015 IECC | Adopted | January 8 2021 | October 31 2022 |
Larimer County | Northern Colorado | 2018 IECC | Adopted | January 10 2022 | March 1 2022 |
City of Longmont | Denver Metro | 2015 IECC | Adopted | November 30 2021 | January 1 2022 |
City of Louisville | Denver Metro | 2018 IECC | Adopted | November 23 2021 | November 23 2021 |
Town of Parker | Denver Metro | 2018 IECC | Adopted | November 1 2021 | January 1 2022 |
Town of Castle Rock | Denver Metro | 2018 IECC | Planned | Spring 2022 | To Be Announced |
City and County of Denver | Denver Metro | 2018 IECC | Planned | In Committee with Planned Adoption Summer 2022 | To Be Announced |
Town of Erie | Denver Metro | 2015 IECC | Planned | Summer 2022 | To Be Announced |
City of Fort Collins | Northern Colorado | 2018 IECC | Planned | Mid April 2022 | To Be Announced |
City of Broomfield | Denver Metro | 2018 IECC | In Discussion | Mid April 2023 | |
City of Castle Pines | Denver Metro | 2015 IECC | In Discussion | Late Summer 2022 | |
City of Lafayette | Denver Metro | 2015 IECC | In Discussion | To Be Announced | |
City of Lakewood | Denver Metro | 2015 IECC | In Discussion | 2nd or 3rd Quarter 2022 | |
City of Lone Tree | Denver Metro | 2018 IECC | In Discussion | Present to City Council October 2022 | |
City of Thorton | Denver Metro | 2018 IECC | In Discussion | May/June 2022 | |
City of Westminister | Denver Metro | 2015 IECC | In Discussion | Mid to Late 2022 |
