Appendix A Guidelines for the Seismic Retrofit of Existing Buildings — 2025 California Existing Building Code
California Existing Building Code (Title 24, Part 10) · 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 Existing Building Code (Title 24, Part 10) Appendix A · Effective January 1, 2026 · Official source: Building Standards Commission
User notes:
About this appendix: Appendix A provides guidelines for upgrading the seismic-resistance capacity of different types of existing buildings. It is organized into separate chapters that deal with buildings of different types, including unreinforced masonry buildings, reinforced concrete and reinforced masonry wall buildings, and light-frame wood buildings.
ICC code development note: Code change proposals to this appendix will be considered by the IBC—Structural Code Development Committee during the
2025 (Group B) Code Development Cycle.
CHAPTER A1
SEISMIC STRENGTHENING PROVISIONS FOR UNREINFORCED MASONRY BEARING WALL BUILDINGS
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