Ch. 12 Interior Environment — 2025 California Building Code
California Building Code (Title 24, Part 2) · 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 Building Code (Title 24, Part 2) Chapter 12 · Effective January 1, 2026 · Official source: Building Standards Commission
User notes:
About this chapter: Chapter 12 provides minimum provisions for the interior of buildings—the occupied environment. Ventilation, lighting, and space heating are directly regulated in this chapter and in conjunction with the California Mechanical Code and the California Energy Code . Minimum room size, maximum room-to-room sound transmission and classroom acoustics are set for educational occupancies.
ICC code development note: Code change proposals to sections preceded by the designation [P] will be considered by a code development committee meting during the 2024 (Group A) Code Development Cycle. All other code change proposals will be considered by a code development committee meeting during the 2025 (Group B) Code Development Cycle.
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