Appendix B — FIRE-FLOW REQUIREMENTS FOR BUILDINGS
B103 Modifications — 2025 California Fire Code
California Fire Code (Title 24, Part 9) · 2025 edition · updated 2026-09-25 · 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) § B103 · Effective January 1, 2026 · Official source: Building Standards Commission
B103.1 Decreases.¶
The fire code official is authorized to reduce the fire-flow requirements for isolated buildings or a group of buildings in rural areas or small communities where the development of full fire-flow requirements is impractical.
B103.2 Increases.¶
The fire code official is authorized to increase the fire-flow requirements where conditions indicate an unusual susceptibility to group fires or conflagrations. An increase shall be not more than twice that required for the building under consideration.
B103.3 Areas without water supply systems.¶
For information regarding water supplies for firefighting purposes in rural and suburban areas in which adequate and reliable water supply systems do not exist, the fire code official is authorized to utilize NFPA 1142 or the California Wildland-Urban Interface Code .
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