Appendix BB — FIRE-FLOW REQUIREMENTS FOR BUILDINGS
BB104 Fire Area — 2025 California Fire Code
California Fire Code (Title 24, Part 9) · 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 Fire Code (Title 24, Part 9) § BB104 · Effective January 1, 2026 · Official source: Building Standards Commission
BB104.1 General.¶
The fire area shall be the total floor area of all floor levels within the exterior walls, and under the horizontal projec- tions of the roof of a building, except as modified in Section 4.
BB104.2 Area separation.¶
Portions of buildings which are separated by one or more 4-hour area separation walls constructed in accor- dance with the building code, without openings and provided with a 30-inch (762 mm) parapet, are allowed to be considered as separate fire areas.
BB104.3 Type I and Type IB construction.¶
The fire area of buildings constructed of Type I and Type IB construction shall be the area of the three largest successive floors.
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