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AB306/AB130 <br />17958.(a)Except as provided in subdivision (b), and in Sections 17958.8 and 17958.9, any city or county may make changes in the <br />provisions adopted pursuant to Section 17922and published in the California Building Standards Code or the other regulations <br />thereafter adopted pursuant to Section 17922 to amend, add, or repeal ordinances or regulationswhich impose the same <br />requirements as are contained in the provisions adopted pursuant to Section 17922 and published in the California Building <br />Standards Code or the otherregulations adopted pursuant to Section 17922 or make changes or modifications in those <br />requirements upon express findings pursuant to Sections 17958.5 and 17958.7. If any cityor county does not amend, add, or repeal <br />ordinances or regulations to impose those requirements or make changes or modifications in those requirements upon express <br />findings,the provisions published in the California Building StandardsCodeor the other regulations promulgated pursuant to <br />Section 17922 shall be applicable to it and shall becomeeffective 180 days after publication by the California Building Standards <br />Commission. Amendments, additions, and deletions to the California Building Standards Code adopted by acity or county <br />pursuant to Section 17958.7, together with all applicable portions of the California Building Standards Code, shall become effective <br />180 days after publication of theCalifornia Building Standards Code by the California Building Standards Commission.(b) Commencing October 1, 2025, to June 1, 2031, inclusive, a city or county shall not make changes that are applicable to <br />residential units in the provisions adopted pursuant toSection 17922 and published in the California Building Standards Code[ie the <br />Residential Building Code]or the other regulations thereafter adopted pursuant to Section 17922 toamend, add, or repeal <br />ordinances or regulations which impose the same requirements as are contained in the provisions adopted pursuant to Section <br />17922[i.e. localamendments/reach code]and published in the California Building Standards Code or the other regulations adopted <br />pursuant to Section 17922 or make changes or modifications inthose requirements upon express findings pursuant to Sections <br />17958.5 and 17958.7, unless one of the following conditions is met:(1)The changes or modifications are substantially equivalent to changesor modifications that were previously filed by the governing <br />body of the city or county and were in effect asof September 30, 2025.(2)The commission deems those changes or modifications necessary as emergency standards to protect health and safety.(3)The changes or modifications relate to home hardening.(4)The building standards relate to home hardening and are proposed for adoption by a fire protection district pursuant to Section <br />13869.7.(5)The changes or modifications are necessary to implement a local code amendment that is adopted to align with a general plan <br />approved on or before June 10, 2025, and thatpermits mixed-fuel residential construction consistent with federal law while also <br />incentivizing all-electric construction as part of an adopted greenhouse gas emissions reductionstrategy.