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Earlier editions: 20222019

Appendix BO — EXISTING BUILDINGS AND STRUCTURES

BO101 Purpose and Intent — 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) § BO101 · Effective January 1, 2026 · Official source: Building Standards Commission

BO101.1 General.

The purpose of these provisions is to encourage the continued use or reuse of legally existing buildings and structures. Structural elements and systems shall comply with Section R102.6.1 and the provisions of this appendix. Repairs, alterations, additions and relocation of existing buildings and structures shall comply with the provisions of this code for new construction, except as modified by this appendix.

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▸Contents — California Residential Code (Title 24, Part 2.5)
California Residential Code (Title 24, Part 2.5)

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