Appendix BO Existing Buildings and Structures — 2025 California Residential Code
California Residential Code (Title 24, Part 2.5) · 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 Residential Code (Title 24, Part 2.5) Appendix BO · Effective January 1, 2026 · Official source: Building Standards Commission
The provisions contained in this appendix are not mandatory unless specifically adopted by a state agency or referenced in the adopting ordinance.
User notes:
About this appendix: Appendix BO regulates the repair, alteration, additions and relocation of existing buildings that are within the scope of this code. It is intended to encourage the continued safe use of existing buildings and ensure that new work conforms to the intent of the code and that existing conditions remain at their current level of compliance or are improved.
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