Sonoma, CA Accessory Structures: Shed & Carport Rules (2026)
Shed permit rules in Sonoma, CA, also referred to as storage shed, backyard shed, or accessory building regulations, set size limits, setbacks, and when a building permit is required.
Key Facts
- Max exempt shed size
- Under 120 sq. ft.
- Max exempt shed height
- 8 ft.
- Location requirement
- Outside front and street-side setbacks
- Limit
- One portable structure per lot/unit
- Over the limits
- Needs zoning clearance and building permit
Summary
A single portable storage shed under 120 square feet and no taller than 8 feet needs no building permit or land use permit in a City of Sonoma residential zone, as long as it sits outside the required front and street-side setbacks, under Sonoma Municipal Code § 19.03.030(B)(6). Bigger or taller sheds, or ones placed inside a setback, fall under the ordinary building and zoning review process instead.
6. Small Residential Accessory Structures (Portable). A single portable structure per lot or unit, including premanufactured storage sheds and other small structures in residential zoning districts that: a. Are exempt from building permit requirements in compliance with SMC Title 14 and the Uniform Building Code; b. Are less than 120 square feet in gross floor area and no more than eight feet in height; and c. Are outside required front and street-side setbacks.
Official source re-checked September 8, 2026: no newer edition of the code had been published (publisher’s edition: current through Ordinance 13-2025, passed December 3, 2025).
Full Breakdown
030 lists the activities and structures the City of Sonoma exempts from its land use permit requirements, and subsection (B)(6), Small Residential Accessory Structures (Portable), covers the backyard shed most homeowners actually build. The exemption allows one portable structure per lot or per residential unit, expressly including premanufactured storage sheds and other small structures in residential zoning districts. To qualify, the shed must clear three tests at once: it must already be exempt from a building permit under Title 14, Buildings and Construction, and the Uniform Building Code; it must be under 120 square feet of gross floor area and no more than 8 feet in height; and it must sit outside the parcel's required front and street-side setbacks, which run from roughly 15 to 30 feet from the front property line in most residential districts depending on the zoning district and planning area.
020 and any building permit Title 14 otherwise requires, plus compliance with the applicable planning area's setback and site coverage standards in Division III of the development code. 030(A): the use must comply with all applicable development standards, must not be part of a larger project requiring a discretionary permit, and must not already be restricted by a prior permit.
Violations & Fines
A shed placed inside a required front or street-side setback, or one that exceeds 120 square feet or 8 feet in height, no longer qualifies for the exemption and becomes a zoning violation if built without the zoning clearance and any building permit Title 14 requires. The City of Sonoma can require the structure be relocated, downsized, permitted after the fact, or removed through its standard code enforcement process.
Frequently Asked Questions
Do I need a permit for a storage shed in my City of Sonoma yard?
Can I put my shed in the setback area next to the street?
What happens if my shed is bigger than 120 square feet?
Sources & Official References
Other rules in Sonoma
How Sonoma compares: Shed Permit Requirements by City·California rules heatmap·Compare Sonoma to another location·View the California accessory structures overview
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Shed & Carport Rules in Nearby Cities
How other cities in Sonoma County handle shed & carport rules.