Fountain Valley, CA Accessory Structures: ADU Owner Occupancy (2026)
Key Facts
- Full ADU created after Jan. 1, 2025
- Must be owner occupied
- Junior ADU
- Main dwelling or the junior unit must be owner-occupied
- Exempt junior ADU owners
- Governmental agency, land trust, or housing organization
- Covenant
- Recorded with county recorder's office
- Covenant copies
- Filed with the building department
- Junior ADU size
- 150 to 500 square feet
Summary
In the City of Fountain Valley, California, accessory dwelling units created after January 1, 2025 must be owner occupied, backed by a recorded covenant. Junior accessory dwelling units need the owner living in either the main dwelling or the junior unit, unless the owner is a governmental agency, land trust, or housing organization.
Accessory dwelling units created after January 1, 2025 shall be owner occupied and a covenant containing this restriction shall also be recorded for accessory dwelling unit's created after January 1, 2025. ... Owner-Occupied. ... The main dwelling or the junior accessory dwelling unit shall be owner-occupied. Notwithstanding the foregoing, owner-occupancy shall not be required if the owner is another governmental agency, land trust, or housing organization. ... Either the main dwelling or the junior accessory dwelling unit shall be owner- occupied except if the owner is a governmental agency, land trust, or housing organization. ... The restrictions shall be binding upon any successor in ownership of the property and lack of compliance with this provision may result in legal action against the property owner including revocation of any right to maintain a junior accessory dwelling unit on the property.
Full Breakdown
Owner occupancy in the City of Fountain Valley is set by Fountain Valley Municipal Code § 21.08.055, and the rule splits by unit type and date. For full accessory dwelling units, the covenant items in subsections (a) and (b) state that accessory dwelling units created after January 1, 2025 shall be owner occupied, and that a covenant containing this restriction shall also be recorded. The date matters: the sentence reaches only units created after January 1, 2025, so it does not by its own words reach earlier ones. The ADU sentence names no exception for public or nonprofit owners.
Junior accessory dwelling units, the units of up to 500 square feet built inside a single-family residence, carry a stricter and more detailed rule under subsection (d). Item (5) says the main dwelling or the junior accessory dwelling unit shall be owner-occupied. That gives the owner a choice of where to live: in the house with the junior unit rented out, or in the junior unit with the house rented out. Owner occupancy is not required if the owner is another governmental agency, land trust, or housing organization.
Item (17) makes the requirement a recorded restriction. Before the junior unit is finished, a covenant must be recorded with the county recorder's office and copies of the recorded covenant filed with the building department. Item (17)(A) repeats that either the main dwelling or the junior accessory dwelling unit shall be owner- occupied except if the owner is a governmental agency, land trust, or housing organization. Item (17)(E) says the covenant runs with the land and binds future owners, heirs, or assigns, so a buyer inherits the obligation.
Section 21.08.055 does not define the term owner-occupied. The definitions in subsection (g) cover terms such as accessory dwelling unit, living area, and permitting agency, but not this one. Owners with questions about how the city applies the term should ask the Fountain Valley building department before recording the covenant.
Violations & Fines
Item (17)(F) states that the restrictions bind any successor in ownership of the property and that lack of compliance with the provision can result in legal action against the property owner, including revocation of any right to maintain a junior accessory dwelling unit on the property. Section 21.08.055 sets no dollar fine for an owner-occupancy breach. For full ADUs created after January 1, 2025, the recorded covenant is the enforcement hook the code names.
Frequently Asked Questions
Does my Fountain Valley ADU have to be owner occupied?
Where must the owner live if I build a junior ADU?
Who is exempt from the junior ADU owner-occupancy rule?
How is owner occupancy enforced after I sell the property?
Sources & Official References
Other rules in Fountain Valley
California rules heatmap·Compare Fountain Valley 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.
ADU Owner Occupancy in Nearby Cities
How other cities in Orange County handle adu owner occupancy.