Energy Code Adoption by State

NAHB has published a detailed catalogue of the model energy codes adopted and amended at the state and local level throughout the country along with information about the processes and governmental bodies that update these codes. This resource will connect state and local HBA staff and members to the policymakers in their area to help them more effectively advocate for NAHB's Housing Policy Priorities.

NAHB previously published a shorter summary of state residential energy code provisions adopted by each of the 50 U.S. states, the District of Columbia, and Puerto Rico. Many states also choose to amend the model code to address local conditions. Information on the most impactful amendments (if applicable) as compared to the model code edition adopted by the state are included in each listing, which also provides the effective date of the state’s most recent code update plus links to the adopted code language and relevant state adoption authority.

Several states do not adopt any mandatory statewide residential energy code (typically referred to as “home rule” states), though there are often codes adopted by local jurisdictions. Some states choose to develop their own energy codes that are not based any edition of the IECC. These resources do not cover the commercial (or nonresidential) energy code provisions adopted by states or jurisdictions.

Hover your cursor over a state in the map below for summary information about its residential energy code. Click on the state to navigate to detailed information about its residential energy code.