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Earlier editions: 20222019

Ch. 28 Mechanical Systems — 2025 California Building Code

California Building Code (Title 24, Part 2) · 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 Building Code (Title 24, Part 2) Chapter 28 · Effective January 1, 2026 · Official source: Building Standards Commission

User notes:

About this chapter: Mechanical systems are a key element of any building. Chapter 28 regulates such systems by linking to the California Mechanical Code and California Plumbing Code, where details of mechanical system requirements are provided.

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▸Contents — California Building Code (Title 24, Part 2)
California Building Code (Title 24, Part 2)

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