Sonoma County, CA Accessory Structures: ADU Owner Occupancy (2026)
Key Facts
- JADU owner-occupancy
- required
- Standard ADU owner-occupancy
- not required
- Enforcement mechanism
- recorded deed restriction
- JADU maximum size
- 500 square feet
- Applies to
- unincorporated county only
Summary
Sonoma County does not require an owner to live on-site for a standalone accessory dwelling unit, but a junior accessory dwelling unit (JADU) carved out of a single-family home does: the property owner must occupy either the main house or the JADU.
(g)Use Restrictions.(1)JADUs may be rented but shall not be sold separate from the single-family residence.(2)JADUs may not be rented for periods of less than thirty (30) days.(3)The owner of the property must reside in either the single-family home or the newly created JADU.(4)Deed Restriction. The property owner shall record a deed restriction that:(i)Prohibits sale of the JADU separate from the single-family residence;(ii)Specifies that the deed restriction runs with the land and is enforceable against future property owners;(iii)Restricts the size and attributes of the JADU to those established by this section and Government Code § 65852.22; and(iv)Makes the county a third-party beneficiary of the deed restriction with the right to enforce the provisions of the deed restriction. (Ord. No. 6352, § X(Exh. B), 9-14-2021)
Editor's note— Ord. No. 6352, § X(Exh. B), adopted Sep. 14, 2021, repealed the former § 26-88-061 and enacted a new section as set out herein. The former § 26-88-061 pertained to similar subject matter and derived from Ord. No. 6191, § III(Exh. B), adopted Jan. 24, 2017.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 64 Update 2).
Full Breakdown
Under Sec. 26-88-061(g), a JADU created inside a single-family home in unincorporated Sonoma County can be rented but not sold separately, cannot be rented for stays under 30 days, and the property owner must reside in either the single-family home or the JADU itself. A deed restriction recording these limits, with the county as an enforceable third-party beneficiary, is required before permit issuance. Full-size, detached ADUs permitted under the separate Sec. 26-88-060 carry no such owner-occupancy condition, only a ban on selling the ADU apart from the primary residence and a 30-day minimum-rental rule. This applies only in the unincorporated county; the cities of Sonoma, Santa Rosa, Petaluma, and Rohnert Park set their own ADU/JADU rules.
Violations & Fines
Renting a JADU without owner-occupancy, or otherwise breaching the recorded deed restriction, is a zoning code violation enforced by Permit Sonoma. Owner-occupied residential violations carry civil penalties of $15-$100/day for a first offense, rising to $200-$500/day for repeat violations within a year, under Sec. 1-7.1.
Frequently Asked Questions
Do I have to live on the property if I build an ADU in unincorporated Sonoma County?
What secures the JADU owner-occupancy requirement?
Sources & Official References
Other rules in Sonoma County
California rules heatmap·Compare Sonoma County to another location·View the California accessory structures overview
See something wrong?
Help us keep this page accurate. If you notice an error or outdated information, let us know.