Index — U
California Mechanical Code (Title 24, Part 4) · 2025 edition · updated 2026-10-23 · 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 Mechanical Code (Title 24, Part 4) · Effective January 1, 2026 · Official source: Building Standards Commission
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UMC
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .223.0
UNCONSTITUTIONAL . . . . . . . . . . . . . . . . . . . . . . . . .101.4
UNDER-FLOOR SPACE . . . . . . . . . . . . . . . . . .304.4, 608.0
UNIT HEATER . . . . . . . . . .223.0, 916.0, Table E 503.7.1(5)
UNSAFE EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . .102.5
UNUSUALLY TIGHT CONSTRUCTION
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .223.0
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