Shed permit rules in San Mateo, CA — also referred to as storage shed, backyard shed, or accessory building regulations — set size limits, setbacks, and when a building permit is required.
Small accessory structures (sheds) in San Mateo must comply with SMMC zoning setbacks. Sheds under 120 sq ft and under 8 feet average height generally do not require a building permit but must comply with zoning requirements.
Under San Mateo's zoning code, accessory structures in residential zones must maintain required setbacks from property lines (typically 4 feet from rear and side boundaries). Small prefabricated sheds under 120 sq ft and under 8 feet in average height are generally exempt from building permit requirements but must still comply with zoning setbacks. Larger structures require a building permit. Sheds cannot be used for habitable purposes without an ADU permit. Contact Building Division at (650) 522-7172.
Unpermitted structure: retroactive permit with penalty. Non-compliant setback: modification or removal. Habitation violation: immediate correction.
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Side-by-side rule comparisons with other cities in San Mateo County.
See how other cities in San Mateo County handle shed rules.
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