Chapter 3 — PROVISIONS FOR ALL COMPLIANCE METHODS
Section 308 — CARBON MONOXIDE DETECTION
2025 California Existing Building Code (Title 24, Part 10) · 2025 edition · ingested 2026-07-07 · California
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308.1 Carbon monoxide detection. ¶
308.1 Carbon monoxide detection. Where an addition, alteration, change of occupancy or relocation of a building is made to an existing building, the existing building shall be provided with carbon monoxide detection in accordance with the California Fire Code or Section R311 of the California Residential Code . 3-6 2025 CALIFORNIA EXISTING BUILDING CODE on Jul 18, 2025 11:14 AM (CDT) THEREUNDER. PROVISIONS FOR ALL COMPLIANCE METHODS
308.2 Carbon monoxide alarms in existing portions of a building. ¶
308.2 Carbon monoxide alarms in existing portions of a building. [HCD 1 & HCD 2] Pursuant to Health and Safety Code Section 17926, carbon monoxide detection shall be provided in all existing Group R buildings, as required in Section 915 of the California Building Code or Section R315 of the California Residential Code, as applicable. 308.2.1 Carbon monoxide detection in existing Group E occupancy buildings. Where the new addition includes any of the conditions identified in the California Fire Code Sections 915.1.2 through 915.1.6, carbon monoxide detection shall be installed in accordance…