Chapter 1 — GENERAL CODE PROVISIONS
1.2.1 Bsc — 2025 California Mechanical Code
California Mechanical Code (Title 24, Part 4) · 2025 edition · updated 2026-10-19 · California
CBSC: official editions, supplements and errata
Italicized text is a California amendment to the model code, as printed in the official publication.
Cite as: 2025 California Mechanical Code (Title 24, Part 4) § 1.2.1 · Effective January 1, 2026 · Official source: Building Standards Commission
Specific scope of application of the agency responsible for enforcement, the enforcement agency, and the specific authority to adopt and enforce such provisions of this code, unless otherwise stated.
(1) State Buildings for All Occupancies.
Application – State buildings (all occupancies), including buildings constructed by the Trustees of the California State University (CSU) and the Regents of the University of California (UC) where no state agency has the authority to adopt building standards applicable to such buildings.
Enforcing Agency – State or local agency specified by the applicable provisions of law.
Authority Cited – Health and Safety Code Section 18934.5.
Reference – Health and Safety Code, Division 13, Part 2.5, commencing with Section 18901.
(2) University of California, California State Universities, and California Community Colleges.
Application – Standards for lighting for parking lots and primary campus walkways at the University of Cali- fornia, California State Universities, and California Community Colleges.
Enforcing Agency – State or local agency specified by the applicable provisions of law.
Authority Cited – Government Code Section 14617.
Reference – Government Code Section 14617.
(3) Existing State-Owned Buildings, including those owned by the University of California and by the Cali- fornia State University – Building seismic retrofit stan- dards including abating falling hazards of structural and nonstructural components and strengthening of building structures. See also Division of the State Architect.
Enforcing Agency – State or local agency specified by the applicable provisions of law.
Authority Cited – Government Code Section 16600.
References – Government Code Sections 16600 through 16604.
(4) Unreinforced Masonry Bearing Wall Buildings.
Application – Minimum seismic strengthening standards for buildings specified in the California Existing Building Code, except for buildings subject to building standards adopted pursuant to Part 1.5 (commencing with Section 17910).
Enforcing Agency – State or local agency specified by the applicable provisions of law.
Authority Cited – Health and Safety Code Section 18934.7.
References – Health and Safety Code Division 13, Part 2.5 commencing with Sections 18901.
1.2.1.1 State Building. For purposes of this code, a “state building” is a structure for which a state agency or state entity has authority to construct, alter, enlarge, replace, repair or demolish.
1.2.1.2 Enforcement. [CSU, UC, Judicial Council & California Department of Corrections and Rehabilita- tion] state agencies or state entities authorized to construct state buildings may appoint a building official who is responsible to the agency for enforcement of the provisions of the California Building Standards Code.
Exception: State buildings regulated by other sections of this code remain the enforcement responsibility of the designated entities.
1.2.1.3 Enforcement, Reserved for DGS.
1.2.1.4 Adopting Agency Identification. The provisions of this code applicable to buildings identified in this section will be identified in the Matrix Adoption Tables under the acronym BSC.
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