Title 24 , Part 6, of the California Building Code of Regulations.  The Energy Efficiency Standards for Residential and Nonresidential Buildings were established in 1978 in response to a legislative mandate to reduce California's energy consumption. New standards were adopted by the Commission in 2001 as mandated by Assembly Bill 970 to reduce California's electricity demand.

Title 24 energy compliance documentation of the California Building Code is required to be submitted prior to issuing building permits when you are building a new residential, or adding new conditioned floor area to an existing building.

California building code efficiency standards (along with those for energy efficient appliances) have saved more than $36 billion in electricity and natural gas costs since 1978. It is estimated the Title 24 standards will save an additional $43 billion by 2013.