Solano County, CA Accessory Structures: Shed Rules (2026)

Solano County Building & Safety Services follows the California Building Code (CBC Section 105.2). A building permit is not required for 'one-story detached accessory structures used as tool and storage sheds, playhouses and other similar uses, provided the floor area does not exceed 120 square feet, and the structure has no utilities' (no electrical, mechanical, or plumbing service). The County notes such structures may still be regulated under fire-related Section 710A in wildland areas. A permit exemption does not waive zoning compliance: detached residential accessory buildings must observe the setback and placement rules in Chapter 28, which generally require accessory structures to sit at least 10 feet from any property line unless the zoning district requires more, and to maintain at least 10 feet of separation from the main building (30 feet in the W - Watershed - District). Sheds larger than 120 square feet, or any shed with electrical or plumbing service, require a building permit. For exact setbacks tied to your specific zoning district, the Planning Division (707-784-6765) is the authority. Because rules vary by parcel and zone, verify before you build.