Welcome to the State of California

Additions & Alterations

Additions, alterations, and repairs are common construction projects for California homeowners. The Title 24 Building Energy Efficiency Standards apply to both additions and alterations, but not to repairs. Additions are changes to an existing building that increase the conditioned floor area and volume. Alterations that are not additions are changes to a building's envelope, space conditioning system, water heating system or lighting system. Repairs are the reconstruction or renewal of any part of an existing building for the purpose of its maintenance. Replacement of any component systems (i.e. re-roofing) or equipment for which there are requirements in the Standards is considered an alteration and not a repair.