Petaluma, CA Accessory Structures: Shed & Carport Rules (2026)
Shed permit rules in Petaluma, 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
- Front setback
- Not permitted in required front yard
- Interior side setback
- 4 feet (RR and R1)
- Rear setback
- 5 feet (4 ft for accessory dwellings)
- Street-side setback
- 40 ft RR / 30 ft R1
- Coverage cap
- 10% of setback area or 500 sf
- ADU exception
- Cap waived for ADUs 800 sf or less
Summary
A detached shed or other accessory structure in Petaluma's RR and R1 zones cannot sit in the required front setback at all, needs only a 4-foot interior side setback and 5-foot rear setback, but must keep a 40-foot (RR) or 30-foot (R1) street-side setback, and its footprint is capped at 10% of the required setback area or 500 square feet, whichever is greater.
| " | RR | R1 | | Detached accessory structure | | | Front | Not Permitted | Not Permitted | | Side – Interior (each) | 4 ft | 4 ft | | Side – Street | 40 ft | 30 ft |
| Rear | 5 ft | 5 ft | ... | Accessory structure, | 10% of the required setback | 10% of the required setback | | detached2 | area or 500 sf, whichever | area or 500 sf, whichever | | | is greater | is greater | ... 2See Section 7.030. Does not apply to accessory dwelling units 800 square feet or less.
Official source re-checked September 8, 2026: no newer edition of the code had been published (publisher’s edition: current through Ordinance 2931 NCS, passed July 6, 2026).
Full Breakdown
6 of the Petaluma Implementing Zoning Ordinance sets separate, more permissive setbacks for detached accessory structures, such as sheds, workshops and detached garages, than for the primary dwelling in the RR and R1 zones. A detached accessory structure is 'Not Permitted' in the required front setback in either zone, but only needs a 4-foot interior side setback and a 5-foot rear setback, far tighter than the 20-foot (RR) or 15-foot (R1) interior side setback and 40-foot (RR) or 30-foot (R1) rear setback required of the primary structure.
The street-side setback for an accessory structure, however, matches the primary structure figure: 40 feet in RR and 30 feet in R1. An accessory dwelling unit built in the rear setback gets its own, even smaller figure, 4 feet, per the table's 'Rear - Accessory dwelling' row. 030's separate accessory dwelling unit standards. 030 ADU standards, not this general accessory-structure table, before assuming this setback and coverage cap applies.
Violations & Fines
Placing a shed or other detached accessory structure inside the front setback, or beyond the coverage cap Table 4.6 sets, is a zoning violation the Zoning Administrator and Building Official enforce under Section 26.010; Section 26.020(A) makes a structure maintained contrary to the ordinance 'unlawful and a public nuisance,' subject to City Attorney abatement, removal or injunction proceedings in court.
Frequently Asked Questions
How close to my rear property line can I build a shed in Petaluma?
Can I put a shed in my front yard in Petaluma?
Is there a size limit on a detached shed in Petaluma?
Sources & Official References
Other rules in Petaluma
How Petaluma compares: Shed Permit Requirements by City·California rules heatmap·Compare Petaluma to another location·View the California accessory structures overview
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