ADU HOA rules in California: what your HOA can and can't do

Can my HOA stop an ADU?

Not on a single-family lot. Section 4751, part of the Davis-Stirling Act that governs HOAs, makes void and unenforceable any provision in a planned development's deeds or governing documents that “effectively prohibits or unreasonably restricts” building or using an ADU or junior ADU on a lot zoned for single-family residential use. Section 714.3 applies the same rule to covenants in any deed or instrument for real property, so a restriction recorded outside an HOA is covered too.

The bill history comes from the state housing department's ADU handbook, which answers the question directly: CC&Rs can't prohibit an ADU or JADU, and such provisions, including operating rules, are void. The protection also requires that your ADU meet state ADU law. A unit that breaks the state's size or setback rules doesn't get it. For those rules, see California ADU laws.

What counts as a reasonable restriction

Both statutes keep “reasonable restrictions” alive. Section 714.3(b) defines them as restrictions that don't unreasonably increase the cost to construct, effectively prohibit construction, or extinguish the ability to build an ADU that complies with state law.

HCD's handbook says an HOA may impose limited objective standards, such as requiring, within reason, specific materials, architectural styles or other design rules. Those standards can't be stricter than state ADU law in a way that raises costs unreasonably or blocks the unit. The handbook lists examples of what crosses the line.

The left column is our reading of HCD's “materials, architectural styles” language, not a safe harbor. A style rule that would double your cost could still be unreasonable. Rules on height and setbacks are where HOAs most often clash with state law; compare any HOA limit with the ADU height limit in California and ADU setbacks.

Civil Code 714.3 and HOA fees

In 2025 the Legislature added one sentence to section 714.3(b): “Reasonable restrictions” shall not include any fees or other financial requirements. The current text has been in effect since June 30, 2025.

So an association can't defend a fee, deposit or other financial condition on your ADU as a “reasonable restriction.” HCD's handbook lists the change among 2025's ADU law updates and cites both sections 714.3 and 4751 for the definition.

Your HOA and the city permit

The city's approval and the HOA's review are separate tracks, and the HOA has no seat at the city's table. HCD says an HOA may not influence a city's ministerial approval of an ADU. Third-party review by an HOA or its agents violates state ADU law, and a city that lets an HOA into any part of the application process is itself in violation. The basis is Government Code section 66315, which bars standards beyond those state ADU law allows.

In practice:

• The city can't ask for an HOA approval letter before issuing your ADU permit.
• The HOA can still run its own architectural review under your CC&Rs, within the limits above.
• Holding a city permit doesn't cancel your obligations under the HOA's reasonable rules. Both apply.

Submitting to both at once saves time. For the city side, see the ADU permit process in San Diego.

How HOA architectural review must work

If your governing documents require approval for physical changes, Civil Code section 4765 sets the ground rules for the association:

• A fair, reasonable and expeditious procedure, written into the governing documents, with prompt deadlines and a stated maximum response time.
• Decisions made in good faith, and not unreasonable, arbitrary or capricious.
• No decision that violates the law, including building codes and land-use law.
• Every decision in writing. A denial must explain why and describe how to ask for reconsideration.
• A right to reconsideration by the board at an open meeting.
• An annual notice to members of what needs approval and how review works.

Read 4765 together with HCD's guidance. A review that runs past 60 days or significantly delays construction can itself be an effective prohibition, according to the handbook.

Renting an ADU in an HOA

An HOA can't block you from renting the ADU. Civil Code section 4741 says an owner in a common interest development isn't subject to a governing-document provision that prohibits, has the effect of prohibiting, or unreasonably restricts renting the home, an ADU or a junior ADU.

For what an ADU rents for, see ADU rental income in San Diego.

Condos, townhomes and common area

HOAs come in several forms. The Civil Code lists four kinds of common interest development: community apartment projects, condominium projects, planned developments and stock cooperatives. Section 4751 is written for planned developments, which the code defines by common area that an association or the owners together own or maintain.

• Single-family homes in a planned development. The core case. Sections 4751 and 714.3 apply if the lot is zoned for single-family use.
• Condos and townhomes in multifamily zones. Through 2026, both statutes protect only lots zoned for single-family use. A unit in a multifamily-zoned project falls outside that wording.
• Building on common area. If the ADU would sit on land the association owns, section 4765(b) says nothing in that section authorizes a change to common area that conflicts with the governing documents unless the law requires it.

Owners of multi-unit buildings have separate state ADU rights; see our multifamily ADU guide.

ADU HOA rules in California from 2027

The protection gets wider on January 1, 2027. AB 956 (Chapter 791, Statutes of 2026) amends both 4751 and 714.3 so they cover a lot zoned to allow single-family residential use, not only a lot zoned for single-family use. That brings in lots in zones that permit houses alongside other housing types. The same bill raises the number of detached ADUs a city must approve on a single-family lot to two. More in California ADU laws 2027.

If your HOA says no

1. Get the decision in writing. Section 4765 requires a written explanation and a reconsideration process. Ask for both.
2. Point to the law. Cite sections 4751 and 714.3 and HCD's handbook, and show how your plans meet state ADU law.
3. Request reconsideration at an open board meeting. Offer changes on genuine design points.
4. Use internal dispute resolution. The Davis-Stirling Act provides an internal dispute resolution process for disputes between an owner and the association.
5. Try ADR before suing. For a lawsuit seeking declaratory or injunctive relief, section 5930 requires the parties to first try alternative dispute resolution.
6. Talk to a lawyer. HCD encourages owners blocked by an HOA to contact their city and seek legal counsel. In a suit to enforce governing documents, the prevailing party is awarded attorney's fees, which raises the stakes for both sides.

Don't start construction to force the issue. If a court later finds a rule reasonable, you could be stuck redoing work. When you're ready to build, compare verified ADU builders in San Diego, check a contractor's license, and ask whether they've worked through HOA review before.

Common questions