Petaluma, CA Accessory Structures: ADU Owner Occupancy (2026)
Key Facts
- Governing section
- IZO §7.035(C)
- Who must occupy
- Owner lives in primary home or JADU
- Exemption
- Government, land trust, or nonprofit affordable-housing owners
- Max JADU size
- 500 square feet (§7.035(I))
- Units per lot
- One JADU per single-family lot
- Enforcement
- Public nuisance, abatement by City Attorney (§26.020)
Summary
Petaluma requires the owner of a parcel with a junior accessory dwelling unit (JADU) to live in either the primary house or the JADU as a principal residence under IZO §7.035(C), unless the property belongs to a government agency, land trust, or nonprofit housing operator building affordable units. Standalone accessory dwelling units carry no such state-preempted owner-occupancy mandate.
C. Owner Occupancy. The owner of a parcel with a single-family dwelling and a proposed junior accessory dwelling unit shall occupy as a principal residence either the primary dwelling or the accessory dwelling, except when the home is owned or operated by a government agency, land trust, or nonprofit housing organization for use as affordable housing.
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
030. Subsection C imposes the city's sole ADU-family owner-occupancy mandate: the owner of a parcel holding a single-family dwelling and a proposed JADU must occupy either the primary dwelling or the JADU as a principal residence. The requirement lapses only when the home is owned or operated by a government agency, a land trust, or a nonprofit housing organization operating the property as affordable housing. 035(F)). 035(G)). 035(B)). 030 impose no owner-occupancy condition at all, reflecting that California's ADU statute bars most local owner-occupancy mandates for full ADUs while still permitting them for JADUs specifically.
A property owner planning a JADU should confirm current occupancy status with the Planning Division before applying, since the exemption for nonprofit or public affordable-housing ownership is narrow and fact-specific.
Violations & Fines
A JADU created without meeting the owner-occupancy condition, or any structure or use maintained contrary to the Implementing Zoning Ordinance, is declared a public nuisance under IZO §26.020(A). The City Attorney, acting on City Council order, may bring abatement, removal, and injunction proceedings against the property, and the Zoning Administrator and Building Official are charged with enforcement under §26.010. Remedies are cumulative, not exclusive, so the city may pursue more than one at once.
Frequently Asked Questions
Do I have to live on the property if I build a JADU in Petaluma?
Does the owner-occupancy rule apply to a regular accessory dwelling unit, not just a JADU?
What happens if I stop living in the house after building a JADU?
Sources & Official References
Other rules in Petaluma
California rules heatmap·Compare Petaluma to another location·View the California accessory structures overview
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ADU Owner Occupancy in Nearby Cities
How other cities in Sonoma County handle adu owner occupancy.