ADUs and HOAs

Will my HOA allow my ADU?

Live in a community with a homeowners association (HOA) and thinking about a backyard cottage, a garage conversion, or a junior ADU? California law gives owners of single-family lots real protection against CC&Rs that block ADUs, but your HOA still has a say in how the ADU looks. Here's a plain-language walk-through, with links to the laws themselves.

Last reviewed October 19, 2026

1 · The short answer

Short answer

On a lot zoned for single-family residential use, California law says a CC&R, deed restriction, or other HOA rule that effectively prohibits or unreasonably restricts building or using an ADU or junior ADU (JADU) is void and unenforceable. That's Civil Code §4751, added by AB 670 in 2019. It protects ADUs and JADUs that meet state ADU law (Gov. Code §66314 and following for ADUs, §66333 and following for JADUs).

That doesn't mean the HOA has no say. The same law still allows "reasonable restrictions": rules that don't unreasonably increase the cost to build, effectively prohibit the ADU, or take away your ability to build one that meets state ADU law. If your governing documents require HOA sign-off for exterior changes, you'll generally still go through the HOA's architectural review.

This protection is tied to owning a lot zoned for single-family use. If you own a condo, the picture is different (next section).

Sources: Cal. Civil Code §4751 (HOA limits on ADUs and JADUs) · AB 670 (2019), chaptered bill text · HCD ADU Handbook (March 2026), Homeowners Associations, pp. 25-26 (PDF)

2 · What do you own?

Single-family lot vs. condo or townhome

California's HOA law (the Davis-Stirling Act) covers several kinds of communities. In a planned development, you own your own lot or parcel, and there is common area owned by the association or shared by the owners, usually managed by the association. In a condominium, you own your unit (the space inside its boundaries) plus a shared interest in the rest of the property, which is common area.

Civil Code §4751 refers to planned developments and protects ADUs and JADUs on a lot zoned for single-family residential use. If you own a house on its own lot in an HOA community, that's the situation it's written for.

If you own a condo, you generally don't own a lot to build on. Unless your documents say otherwise, when walls, floors, and ceilings are your unit's boundaries, only their interior surfaces belong to your unit and the rest is common area. The architectural-review law also says it doesn't authorize changes to common area that are inconsistent with the governing documents, unless the change is required by law. So in a condo community, an ADU generally depends on what your governing documents allow and on the association agreeing; §4751 isn't written for that situation.

Townhomes can go either way. Some sit on their own separately owned lots in a planned development; others are legally condominiums even though they look like houses. Your grant deed, the recorded map or condominium plan, and your CC&Rs show which one you have, and a title company or attorney can help you read them.

A JADU is a unit of up to 500 sq ft created entirely within a single-family home (Gov. Code §66313). §4751 names JADUs as well as ADUs. State ADU law also allows some ADUs in and around multifamily buildings (Gov. Code §66323), but §4751's protection is written for single-family-zoned lots, so in a condo building the governing documents and common-area rules still control.

Sources: Cal. Civil Code §4751 (HOA limits on ADUs and JADUs) · Cal. Civil Code §4175 (planned development) · Cal. Civil Code §4125 (condominium) · Cal. Civil Code §4185 (separate interest) · Cal. Civil Code §4095 (common area) · Cal. Civil Code §4765 (HOA architectural review) · Cal. Gov. Code §66313 (ADU and JADU definitions) · Cal. Gov. Code §66323 (ADU combinations; rentals over 30 days)

3 · Limits on the HOA

What your HOA can't do (on a single-family lot)

When §4751 applies, HOA rules that go too far are void and unenforceable. Based on the statute and the California Department of Housing and Community Development (HCD) ADU Handbook, an HOA generally can't:

Enforce a CC&R or rule that bans ADUs or JADUs outright, or bans them in practice, such as a placement rule that leaves no usable spot for one on your lot.
Impose restrictions that unreasonably increase the cost to build, or that take away your ability to build an ADU that meets state ADU law.
Demand plan changes that would cost you substantially more or force you to give up the project, or major structural or design changes beyond what state ADU law requires (HCD examples).
Use standards that aren't objective, or that you couldn't know about before you applied (HCD example).
Drag out its review. HCD's Handbook lists, as an example of an effective prohibition, a review delay longer than the 60 days cities and counties get, or one that significantly delays building or using the ADU.
Stop you from renting the ADU or JADU to a tenant (see Renting your ADU below).
Weigh in on your city's or county's permit. Cities and counties review ADU permits ministerially, without discretionary review or a hearing, and HCD says HOA third-party review as part of that permit process would violate state ADU law (Gov. Code §§66315, 66317).

Fees: HCD's Handbook says reasonable restrictions can't include fees or other financial requirements, citing Civil Code §714.3(b), a parallel rule for deeds and other property documents that was updated in 2025. §4751 itself doesn't contain that sentence, so if your HOA charges a review fee, ask an attorney how this applies.

Sources: Cal. Civil Code §4751 (HOA limits on ADUs and JADUs) · Cal. Civil Code §714.3 (deed restrictions on ADUs; no fees) · HCD ADU Handbook (March 2026), Homeowners Associations, pp. 25-26 (PDF) · Cal. Gov. Code §66315 (no extra standards; no owner occupancy; 30-day rentals) · Cal. Gov. Code §66317 (ministerial permits; 60-day decision)

4 · What the HOA keeps

What your HOA can still do

HOAs keep a real role, as long as their rules stay reasonable under §4751. Generally, an HOA can:

Require you to go through its architectural review, if your governing documents require HOA sign-off before you make physical changes (Civil Code §4765).
Apply reasonable design standards. HCD's Handbook says HOAs may impose some limited objective standards, such as requiring, within reason, specific materials, architectural styles, or other design and aesthetic restrictions, as long as they don't unreasonably increase the cost or effectively prohibit the ADU.
Expect changes to the outside of your home to follow the governing documents and applicable law (Civil Code §4760(b)).
Keep applying its other governing-document rules. §4751 voids only rules that effectively prohibit or unreasonably restrict ADUs and JADUs.
Ban short-term rentals of 30 days or less, within limits (see Renting your ADU).

Zoning, height limits, setbacks, and building codes are your city's or county's job, not the HOA's. The city or county applies state ADU law and its own ADU ordinance when it issues the permit. An HOA's own design rules are a separate layer, and an HOA decision on your plans can't violate a building code or other land-use law (Civil Code §4765(a)(3)).

Sources: Cal. Civil Code §4765 (HOA architectural review) · Cal. Civil Code §4760 (improvements and exterior changes) · Cal. Civil Code §4751 (HOA limits on ADUs and JADUs) · HCD ADU Handbook (March 2026), Homeowners Associations, pp. 25-26 (PDF) · Cal. Gov. Code §66317 (ministerial permits; 60-day decision)

5 · Rentals

Renting your ADU

Civil Code §4741 (added by AB 3182, in effect since January 1, 2021) says an owner in an HOA community isn't subject to a governing-document rule that prohibits, has the effect of prohibiting, or unreasonably restricts renting or leasing the home, an ADU, or a JADU to a tenant. It applies even if the HOA hasn't updated its documents. An HOA that willfully violates it can owe actual damages plus a civil penalty of up to $1,000.

HOAs may still prohibit transient or short-term rentals of 30 days or less. The statute words that exception in terms of renting a separate interest (your home or lot), and it says an ADU or JADU isn't treated as a separate interest for that section. It doesn't spell out how the short-stay exception applies to an ADU, so check with your HOA or an attorney before listing an ADU for short stays.

Your city or county can limit short stays too. On a single-family lot, a city may require that rentals on a property with an ADU be for terms of 30 days or longer (Gov. Code §66315). ADUs created under the state's §66323 combinations must be rented for terms longer than 30 days, and state law directs local JADU ordinances to require JADU rentals longer than 30 days (Gov. Code §66333(g)). Many cities also have their own short-term rental rules.

Owner occupancy: state ADU law bars cities and counties from requiring the owner to live on a single-family lot with an ADU (Gov. Code §66315). For a JADU, owner occupancy (in the home or the JADU) applies only if the JADU shares a bathroom with the house (Gov. Code §66333(b), as updated for 2026). The HOA laws on this page don't directly address an HOA owner-occupancy rule, so if your CC&Rs have one, ask an attorney how §§4741 and 4751 apply.

Sources: Cal. Civil Code §4741 (renting ADUs in an HOA) · Cal. Civil Code §4740 (HOA rental rules) · AB 3182 (2020), chaptered bill text · Cal. Gov. Code §66315 (no extra standards; no owner occupancy; 30-day rentals) · Cal. Gov. Code §66323 (ADU combinations; rentals over 30 days) · Cal. Gov. Code §66333 (JADU rules)

6 · The process

How HOA review works

If your governing documents require HOA sign-off before you change your home or lot, Civil Code §4765 sets the ground rules. The HOA must:

Have a fair, reasonable, and expeditious procedure, written into its governing documents, with prompt deadlines and a stated maximum time to respond.
Decide in good faith. A decision can't be unreasonable, arbitrary, or capricious.
Not make a decision that violates the law, including building codes and other land-use or public-safety laws.
Give its decision in writing. If the answer is no, it must explain why and describe how to ask the board to reconsider.
Give you reconsideration by the board at an open board meeting if the answer is no (unless the board itself made the decision at a properly held board meeting).
Send members a notice each year describing which changes need HOA sign-off, with a copy of the review procedure.

Is there a 60-day HOA deadline? Not in the HOA statutes. The 60-day clock in state ADU law is for cities and counties: once your permit application is complete, the city or county has 60 days to act on it (Gov. Code §66317(a)(3)). For HOAs, §4765 requires prompt deadlines set in the governing documents but doesn't name a number of days. Separately, HCD's Handbook says an HOA review delay longer than the 60 days local agencies get, or one that significantly delays the project, may count as an effective prohibition.

Sources: Cal. Civil Code §4765 (HOA architectural review) · Cal. Gov. Code §66317 (ministerial permits; 60-day decision) · HCD ADU Handbook (March 2026), Homeowners Associations, pp. 25-26 (PDF)

Next steps

A simple order of operations for homeowners in an HOA:

Find out what you own: a lot in a planned development, or a condo unit. Check your grant deed, the recorded map or condominium plan, and your CC&Rs.
Read your CC&Rs, architectural guidelines, and rules for anything about second units, outbuildings, rentals, or design. On a single-family-zoned lot, an old clause that bans ADUs is void under §4751, but reasonable design rules can still apply.
Ask the HOA for its architectural review procedure and response deadlines.
Submit plans to the HOA early, with drawings that show materials, colors, and roof style. Keep copies of everything in writing.
Apply for your permit with your city or county, which issues ADU permits. The HOA isn't part of that process.
If the HOA says no, ask the board to reconsider. HCD encourages owners whose ADU is held up by an HOA to contact their city or county and to seek legal counsel.

Quick answers

Can my HOA ban ADUs in California?

Not on a lot zoned for single-family residential use, when the ADU or JADU meets state ADU law. Civil Code §4751 makes CC&Rs and HOA rules that effectively prohibit or unreasonably restrict ADUs and JADUs void and unenforceable. Reasonable restrictions, such as design standards, can still apply.

Does my HOA still get to review my ADU plans?

If your governing documents require HOA sign-off for exterior changes, generally yes. The review must follow Civil Code §4765: a fair, reasonable, and expeditious procedure, a written decision, and a chance to ask the board to reconsider.

Can my HOA stop me from renting my ADU?

Civil Code §4741 bars HOA rules that prohibit or unreasonably restrict renting an ADU or JADU. HOAs may still prohibit short-term rentals of 30 days or less (how that applies to an ADU isn't spelled out), and your city or county may have its own rental rules.

I own a condo. Can I add an ADU?

Civil Code §4751 is written for lots zoned single-family. In a condo, much of the building and land is common area, so an ADU generally depends on your governing documents and the association. An attorney can review your documents.

Does my HOA have 60 days to decide?

No HOA statute sets a 60-day deadline. The 60-day limit in Gov. Code §66317 is for city and county permit decisions. Civil Code §4765 requires HOAs to set prompt deadlines in their governing documents, and HCD's Handbook says an HOA delay beyond 60 days may be an effective prohibition.

Sources

The California statutes, bill texts, and state guidance this page is based on.

Check ADU rules for your address