The California Health and Safety Code is the document that stipulates which building standards shall be applied to all of the occupancies throughout the state. The reference is:
California Health and Safety Code
Division 13 - Housing
Part 2.5 - State Building Standards
Chapter 4 - The California Building Standards Code
SECTION 18938
Under section 18938 (b), the standards that influence energy efficiency considerations are in: the Uniform Building Code of the International Conference of Building Officials; the Uniform Fire Code (UFC) of the International Conference of Building Officials and the Western Fire Chiefs Association, Inc.; and the Uniform Mechanical Code (UMC) of the International Conference of Building Officials and the International Association of Plumbing and Mechanical Officials.