Electrical Code Adoption by State

Like most building codes, electrical codes are adopted by states (and some cities/counties) creating a patchwork of standards across the U.S. Most states have adopted an amended version of the National Electrical Code (NEC) while others adopt the electrical provisions in the International Residential Code (IRC).

See the map below for a quick overview of NEC adoption status by state. For more detail on state-level amendments to the code, see the State Adoptions of the National Electrical Code document.

NAHB provides resources to help builders and HBAs navigate the new requirements of recent NEC editions. NAHB staff also remains heavily involved in the development of future versions of the NEC.