R312 Minimum Room Areas — 2025 California Residential Code
California Residential Code (Title 24, Part 2.5) · 2025 edition · updated 2026-09-26 · 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 Residential Code (Title 24, Part 2.5) § R312 · Effective January 1, 2026 · Official source: Building Standards Commission
R312.1 Minimum area.¶
Habitable rooms shall have a floor area of not less than 70 square feet (6.5 m [2] ).
Exception: Kitchens.
R312.2 Minimum dimensions.¶
Habitable rooms shall be not less than 7 feet (2134 mm) in any horizontal dimension.
Exceptions:
1. Kitchens.
2. Limited-density owner-built rural dwellings. See Section R301.1.1.1.
R312.3 Height effect on room area.¶
Portions of a room with a sloping ceiling measuring less than 5 feet (1524 mm) or a furred ceiling measuring less than 7 feet (2134 mm) from the finished floor to the finished ceiling shall not be considered as contributing to the minimum required habitable area for that room.
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