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Earlier editions: 20222019

Appendix BO — EXISTING BUILDINGS AND STRUCTURES

BO103 Definitions — 2025 California Residential Code

California Residential Code (Title 24, Part 2.5) · 2025 edition · updated 2026-10-19 · California

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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) § BO103 · Effective January 1, 2026 · Official source: Building Standards Commission

BO103.1 General.

The terms used in this appendix, and not provided in Chapter 2, are defined as follows:

DANGEROUS. Any building, structure or portion thereof that meets any of the conditions described below shall be deemed dangerous:

  1. The building or structure has collapsed, has partially collapsed, has moved off its foundation or lacks the necessary support of the ground.
  2. There exists a significant risk of collapse, detachment or dislodgement of any portion, member, appurtenance or ornamentation of the building or structure under permanent, routine or frequent loads; under actual loads already in effect; or under snow, wind, rain, flood, earthquake aftershock or other environmental loads when such loads are imminent.
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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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