Shed permit rules in Napa County, CA — also referred to as storage shed, backyard shed, or accessory building regulations — set size limits, setbacks, and when a building permit is required.
Per the California Building Code section 105.2 (adopted via Napa County Code Title 15, Chapter 15.12), one-story detached storage sheds with a floor area of 120 sq ft or less are exempt from a building permit, but zoning setbacks under Napa County Code Title 18 (including the four-foot side/rear standard for accessory buildings on lots under 60 feet wide) still apply.
Napa County adopts the California Building Code by reference in Title 15, Chapter 15.12. California Building Code (CBC) § 105.2 exempts from the building-permit requirement one-story detached accessory structures used as tool and storage sheds, playhouses, and similar uses if the floor area does not exceed 120 square feet, the structure has no plumbing or mechanical equipment, and the work is otherwise minor. Zoning setbacks under Napa County Code Title 18 still apply regardless of size: detached garages and accessory buildings on a lot with a width less than 60 feet at the front-yard setback line must observe a five-foot side yard setback per Napa County Code § 18.104.140-related provisions, and the County's ADU Delayed Enforcement Inspection Checklist confirms that the four-foot side/rear setback standard applies to most detached accessory structures. Sheds with electrical service still require an electrical permit, and storage of hazardous materials or any habitable conversion triggers full building-permit requirements. Sheds must also be free of pest infestation and structurally sound per the County's Yard & Outdoor Areas standards.
Building a shed over 120 sq ft without a permit, or violating zoning setbacks with any shed, can trigger stop-work orders and code-enforcement citations under Napa County Code Title 1 and Title 15. Owners must obtain a retroactive permit or remove the structure. Habitable conversions (sheds used for sleeping) trigger Health & Safety Code violations and ADU-permitting requirements.
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