Shed Rules: Petaluma vs Sonoma
How do shed rules rules compare between Petaluma, CA and Sonoma, CA?
Petaluma has fewer restrictions than Sonoma.
Petaluma, CA
Sonoma County
Per California Building Code Section 105.2 (adopted in Sonoma County Code Chapter 7), one-story detached storage sheds with a floor area of 120 square feet or less are exempt from a building permit, but zoning setbacks and the Permit Sonoma accessory structure rules still apply.
View full Petaluma rules →Sonoma, CA
Sonoma County
Detached storage sheds 120 sq ft or smaller and not over 8 ft tall may sit at the side or rear property line without a building permit; anything larger triggers SMC 19.50.080 standards and a Permit Sonoma building permit.
View full Sonoma rules →Key Facts Comparison
| Fact | Petaluma | Sonoma |
|---|---|---|
| Permit-Exempt Size | ≤ 120 sq ft | - |
| Max Accessory Structure Size | 3,000 sq ft | - |
| Max Height | Two stories | - |
| Storage Building Electrical | ≤ 40 amp sub-panel | - |
| Code Reference | Chapter 7; Policy 1-4-6 | - |
| Permit-exempt shed size | - | Up to 120 sq ft, 8 ft tall, no utilities (SMC 19.50.080 / BPC-005) |
| Max accessory structure height | - | 15 ft above finished grade |
| Side/rear setback for ≤120 sq ft | - | 0 ft (may sit at property line) |
| Front/street-side setback | - | Prohibited in required front and street-side setbacks |
| Max coverage | - | 50% of required rear yard |
Highlighted rows indicate differences between cities.
Petaluma FAQ
Do I need a permit for a small garden shed?
No building permit is required if the shed is one story, has no more than 120 square feet of floor area, and has no electrical, plumbing, or mechanical work. Zoning setbacks still apply regardless of size.
What's the largest shed I can build on a residential lot?
Sonoma County's accessory-structure definition caps detached residential accessory structures at 3,000 square feet and two stories. Larger structures generally require classification as something other than residential accessory.
Can I run electricity to my shed?
A storage building classified as Group U may have no more than a 40-amp electrical sub-panel and no waste plumbing per Permit Sonoma Policy 1-4-6. Any electrical work itself requires an electrical permit.
Sonoma FAQ
Can I put a 10x12 shed (120 sq ft) on my property line in Sonoma?
Yes — SMC 19.50.080 lets detached accessory structures up to 120 sq ft and 8 ft tall sit at the side or rear property line, and Permit Sonoma's BPC-005 exempts it from a building permit if it has no plumbing, wiring, or heating equipment. Front and street-side setbacks remain off-limits.
Do I need a permit for a 200 sq ft shed?
Yes. Any accessory structure larger than 120 sq ft requires a building permit from Permit Sonoma, must meet the underlying zone setbacks (not the relaxed 0-ft line), cannot exceed 15 ft in height, and counts toward the 50% accessory-structure rear-yard coverage cap.
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