Existing law establishes the Department of Housing and Community Development (department) in the Business, Consumer Services, and Housing Agency. Existing law, the California Building Standards Law, establishes the California Building Standards Commission (commission) within the Department of General Services. Existing law requires the commission to approve and adopt building standards and to codify those standards in the California Building Standards Code (code) . Existing law, the State Housing Law, establishes statewide construction and occupancy standards for buildings used for human habitation.
Existing law requires, among other things, the building standards adopted and submitted by the department for approval by the commission, as specified, to be adopted by reference, with certain exceptions. Existing law authorizes any city or county to make changes in those building standards that are published in the code, including to green building standards. Existing law requires the governing body of a city or county, before making modifications or changes to those green building standards, to make an express finding that those modifications or changes are reasonably necessary because of local climatic, geological, or topographical conditions.
This bill would, from June 1, 2025, until June 1, 2031, inclusive, prohibit a city or county from making changes to the above-described building standards unless a certain condition is met, including that the commission deems those changes or modifications necessary as emergency standards to protect health and safety. By requiring a city or county to take certain actions relating to building standards, this bill would impose a state-mandated local program.
This bill would, from June 1, 2025, until June 1, 2031, inclusive, require the commission to reject a modification or change to any building standard, as described above, affecting a residential unit and filed by the governing body of a city or county unless a certain condition is met, including that the commission deems those changes or modifications necessary as emergency standards to protect health and safety. The bill would also make related findings and declarations.
Existing law requires the commission to receive proposed building standards from state agencies for consideration in an 18-month code adoption cycle and to develop regulations, as specified, setting forth the procedures for the 18-month adoption cycle.
This bill, from June 1, 2025, until June 1, 2031, inclusive, would provide that the above-described requirement does not apply to any building standards affecting residential units and would prohibit the commission from considering, approving, or adopting any proposed building standards affecting residential units, unless a certain condition is met, including that the commission deems those changes necessary as emergency standards to protect health and safety.
The California Building Standards Law provides for the adoption of building standards by state agencies by requiring all state agencies that adopt or propose adoption of any building standard to submit the building standard to the commission for approval and adoption.
This bill would prohibit the commission or any other adopting agency from considering, approving, or adopting any proposed building standards affecting residential units, unless a certain condition is met, including that the commission deems those changes necessary as emergency standards to protect health and safety.
The bill would include findings that changes proposed by this bill address a matter of statewide concern rather than a municipal affair and, therefore, apply to all cities, including charter cities.
This bill would declare that it is to take effect immediately as an urgency statute.

Statutes affected:
AB 306: 17958 HSC, 17958.5 HSC, 17958.7 HSC, 18929.1 HSC, 18930 HSC
01/23/25 - Introduced: 17958 HSC, 17958.5 HSC, 17958.7 HSC, 18929.1 HSC, 18930 HSC