Building Energy Code


Program Building Energy Code
Category Regulatory Policy
Implementing sector State
Last Update
State California
Administrator -
Budget -
Start Date
Technologies Solar - Passive, Solar Water Heat, Solar Photovoltaics
Sectors Residential

Much of the information presented in this summary is drawn from the U.S. Department of Energy’s (DOE) Building Energy Codes Program and the Building Codes Assistance Project (BCAP). For more detailed information about building energy codes, visit the DOE and BCAP websites.

The California Building Standards Commission (BSC) is responsible for administering California's building standards adoption, publication, and implementation. Since 1989, the BSC has published triennial editions of the code, commonly referred to as Title 24, in its entirety every three years. On July 17, 2008 the BSC unanimously approved the nation's first statewide voluntary green building code. In January 2010, the BSC adopted a final version of the new green building code, CALGreen, parts of which became mandatory on January 1, 2011. CALGreen exists alongside the latest edition of Title 24, the Building Energy Efficiency Standards, which took effect on January 1, 2017. CALGreen includes provisions to ensure the reduction of water use by 20%, improve indoor air quality, divert 50% of new construction waste from landfills, and inspect energy systems (i.e. heat furnace, air conditioner, mechanical equipment) for nonresidential buildings over 10,000 square feet to make sure that they're working according to design.

Title 24 applies to all buildings that are heated and/or mechanically cooled and are defined under the Uniform Building Code as A, B, E, H, N, R, or S occupancies, except registered historical buildings. Additions and renovations are also covered by the code. Institutional building's which include hospitals and prisons are not covered.

Local governmental agencies can modify the state energy code to be more stringent when documentation is provided to the California Energy Commission.

2019 Building Energy Efficiency Standards and Solar Requirement

The California Energy Commission adopted revisions to the Energy code in May 2018. The most noteworthy new provision is a requirement for all new low-rise homes to install photovoltaic (PV) equipment with an annual output greater than or equal to the homes annual electrical consumption. The code provides six exceptions to this rule, which are detailed in Subchapter 8 of the code. The proposed amended standards, which still need to be approved by the California Building Standards Commission would go into effect on January 1, 2020.

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