ADU Rules: Petaluma vs Rohnert Park
How do adu rules rules compare between Petaluma, CA and Rohnert Park, CA?
Petaluma has fewer restrictions than Rohnert Park.
Petaluma, CA
Sonoma County
Petaluma IZO §7.030 implements California's permissive ADU laws (Gov Code §65852.2). Most single-family lots may build at least one ADU and one Junior ADU.
View full Petaluma rules →Rohnert Park, CA
Sonoma County
Key Facts Comparison
| Fact | Petaluma | Rohnert Park |
|---|---|---|
| Detached ADU Max | 800 sq ft (statewide standard) | - |
| Setback | 4 ft side/rear | - |
| Approval Window | 60 days | - |
| Code Section | - | § 26-88-060 |
| Max Size | - | 1,200 sq ft |
| Detached Height Limit | - | 18 feet |
| Side/Rear Setback | - | 4 feet minimum |
| Parking | - | 1 space (with exemptions) |
| Permit Type | - | Ministerial zoning permit |
Highlighted rows indicate differences between cities.
Petaluma FAQ
Do I need to live in the main house?
Owner-occupancy requirements have been suspended statewide through Jan 1, 2025 (now extended).
Rohnert Park FAQ
Can I build both an attached and a detached ADU on the same lot?
Yes. Section 26-88-060 allows one attached ADU within or attached to the primary dwelling or an accessory structure, plus one detached ADU, on a single-family parcel.
What if my property is in the Z combining district?
ADUs are prohibited on parcels in the Z (ADU exclusion) combining district, which covers areas with natural hazards, public safety issues, or water availability concerns. The County removed the Z designation from over 1,900 parcels in 2019, but remaining Z-zoned owners must petition for a zone change.
Are ADUs allowed to be rented short-term?
No. Permit Sonoma confirms that accessory dwelling units cannot be used as vacation rentals or for any other transient occupancy under 30 days.
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