Shed permit rules in Napa, CA — also referred to as storage shed, backyard shed, or accessory building regulations — set size limits, setbacks, and when a building permit is required.
City of Napa follows California Building Code §105.2 and Napa Municipal Code Title 17. Detached one-story sheds under 120 sq ft are exempt from a building permit but must meet zoning setbacks, height limits, and lot-coverage. Larger sheds need a permit.
California Building Code §105.2, adopted by the City of Napa, exempts one-story detached accessory structures used as tool sheds, playhouses, and similar uses from a building permit when the projected floor area does not exceed 120 sq ft. The exemption is only from the building permit; zoning in Napa Municipal Code Title 17 still applies. Sheds count toward the lot-coverage cap of the residential zone, must observe required side and rear setbacks (typically 5 feet), and are not allowed in the required front-yard setback. Any shed wired for electricity or plumbed for water requires a separate electrical or plumbing permit regardless of size. Sheds in FEMA flood hazard areas must meet additional flood-resistant construction under Title 15.
Unpermitted sheds over 120 sq ft are subject to stop-work orders, retroactive permits at double fees, or removal. Sheds in front setbacks may be relocated at owner cost. Code Enforcement may issue escalating administrative citations.
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