California enforces a statewide building code adoption with both state and local amendments. The 2022 California Building Standards Code (Title 24) took effect on January 1, 2023, as established by the California Building Standards Commission (CBSC). This code is based on the 2021 editions of the International Building Code (IBC), International Fire Code (IFC), International Residential Code (IRC), and International Existing Building Code (IEBC), with California-specific amendments.

Local jurisdictions may adopt additional amendments to address regional concerns, such as seismic activity, wildfire risks, and environmental factors. It is recommended to check with local authorities for specific amendments that may apply to a project.