Can You Sell an ADU Separately in California? AB 1033 Explained (2026)

For years, a California ADU was something you could rent but never sell on its own. AB 1033, signed in 2023, changed that, but with a major catch: the state law does not authorize separate ADU sales by itself. It lets each city or county choose to allow them by passing a local ordinance. So the honest answer to "can I sell my ADU separately in California?" depends entirely on your address. In the Bay Area, one city has fully committed, made national news, and already closed the first sale in state history. Everywhere else, the answer is usually still no. This guide explains exactly how the AB 1033 condo-conversion process works, which Bay Area cities have opted in as of 2026, what it costs, and how selling compares to simply renting your ADU.

Can you sell an ADU separately from the main house in California?

Yes, but only if your ADU sits in one of the small number of California cities that has opted into AB 1033, which as of 2026 is a single digit statewide. AB 1033 (2023, Assemblymember Ting) is an enabling law: it gives local governments the option to permit ADUs to be sold or conveyed separately, but it takes effect nowhere until that specific jurisdiction adopts its own ordinance. If your city has not passed one, a separate sale is legally impossible no matter how the ADU is built. That is the single most important fact for any Bay Area homeowner researching this: check your city first, because in most of the region the answer is still no.

When a city has opted in, the sale does not happen by subdividing your lot. Your parcel stays whole. Instead, it is legally divided into two condominium units, the primary home and the ADU, each getting its own deed, its own property-tax bill and its own title, exactly like units in a condo building. Only the ADU condo changes hands; you keep the main-house condo.

What is AB 1033 and how does the condo-conversion process work?

AB 1033 lets an opted-in city approve a condominium conversion that turns one single-family property into two separately-sellable condos, and the process typically takes 6+ months and involves at least five formal steps. The lot is never physically split; the division is purely legal. Here is what the conversion requires:

• A condominium plan or map prepared by a licensed surveyor or civil engineer and recorded with the county recorder, defining each unit's boundaries.
• CC&Rs (covenants, conditions and restrictions) drafted by a real-estate attorney, governing shared responsibilities between the two owners.
• A homeowners association (HOA), newly formed to administer the two-unit condo project.
• Separate utility metering, so the ADU has independent water, gas and electric billing.
• Lienholder (mortgage) consent, because your existing lender's loan is secured by the whole property and it must agree to the division.

Because the sequence involves surveying, civil engineering, legal drafting, HOA creation and sometimes a public hearing, most conversions run six months or longer before the ADU can be listed. This is a permitting and entitlements process, not a simple deed edit, which is why homeowners usually bring in a design-build team plus a real-estate attorney to run it.

Which Bay Area cities have opted into AB 1033 as of 2026? Is San Jose one of them?

As of early 2026, San Jose is the only confirmed Bay Area city that has opted into AB 1033, and it is the flagship success story statewide. Reporting and city records confirm just a handful of California jurisdictions have adopted ordinances so far. Everything outside this list should be treated as not yet available until you confirm directly with the local planning department.

San Jose earned its headline in 2026. A 749 sq ft ADU on Josefa Street near downtown had its condo conversion approved on August 14, 2025, and the standalone unit closed in early July 2026 for $530,000, California's first separate, arm's-length ADU sale under AB 1033. The parcel was not subdivided; it was converted into two condos, and only the ADU sold. Some sources list Berkeley or Sacramento as participating, but those are unconfirmed, so verify with your city before counting on it. See our San Jose service area page for how we work in the city that pioneered this.

How much does it cost to convert an ADU into a sellable condo?

Expect roughly $15,000 to $40,000 in soft costs to convert an ADU into a separately-sellable condo, and up to $50,000 to $75,000 if your lender imposes conditions or you need utility upgrades. None of this includes building the ADU itself, which in Silicon Valley runs $175,000 to $450,000+ (about $350 to $650+ per square foot in 2026). The conversion cost is layered on top of an existing, permitted unit.

Because the conversion overlaps heavily with entitlement and utility work, folding it into the original ADU project, or planning for it from day one, tends to be cheaper than retrofitting later. Our San Jose ADU cost guide breaks down the underlying build numbers that these conversion costs sit on top of.

Do you need an HOA, and what about your existing mortgage and title?

Yes, every AB 1033 conversion requires forming a new HOA, and your existing mortgage lender must consent before the property can be legally divided. These two requirements are the most common friction points that stall or kill a conversion. The new HOA administers the shared CC&Rs between the main-house owner and the ADU owner, covering things like shared driveways, roofs and insurance. If your property is already inside an existing HOA, that association's approval, sometimes a member vote, may also be needed.

The mortgage piece is decisive. Your current loan is secured by the entire parcel, so the lienholder has to agree to split it into two titled condos; some mortgages contain terms that restrict dividing the property at all. Layer on separate title insurance for each unit and the reality that your buyer needs their own financing on a brand-new condo product, and you can see why lender and title coordination is where a real-estate attorney earns their fee. Plan for this early, not after you have a buyer.

What are the pros and cons of selling your ADU versus renting it out?

Selling delivers a one-time lump sum (about $530,000 in the San Jose example) with no landlord duties, while renting delivers recurring monthly income you keep for as long as you own the unit. Neither requires you to live on-site, because AB 976 permanently removed the owner-occupancy rule for standard ADUs. The right call depends on whether you want equity now or cash flow over time, and, critically, whether your city even allows a sale.

Pros of selling: you unlock equity without selling your whole home, open affordable ownership to a first-time buyer, and shed all landlord duties. Cons: it is legal in only a few cities, the conversion is slow and expensive, the HOA and shared CC&Rs are permanent, lender and title hurdles are real, and you give up both the asset and its recurring income. For a fuller comparison of building strategies, see our ADU vs home addition guide.

Do California's other ADU laws (SB 13, AB 976, AB 1154) affect a separate sale?

They shape the economics around your ADU but none of them authorizes a separate sale; only an AB 1033 opt-in ordinance does that. It is worth getting the four laws straight, because they are frequently mixed up:

• AB 1033 (2023): the only law that allows an ADU to be sold or conveyed separately as a condo, and only where a city opts in.
• SB 13 (2019): waives development impact fees for ADUs under 750 sq ft, and exempts units under 500 sq ft from school impact fees. This is the impact-fee break, and it comes from SB 13, not AB 976.
• AB 976 (2024): permanently removed the owner-occupancy requirement for standard ADUs, so you never have to live on-site to rent or hold one.
• AB 1154 (effective Jan 1, 2026): reinstated owner-occupancy for a JADU only when it shares a bathroom with the primary home; JADUs with a separate bathroom have no such requirement.

So SB 13 may have saved you fees when you built, AB 976 lets you rent freely, and AB 1154 only touches shared-bath JADUs. When it comes to actually selling the unit, AB 1033 and your city's ordinance are the only things that matter.

How do I find out if my city allows separate ADU sales?

Call your city or county planning department and ask one direct question: "Has this jurisdiction adopted an AB 1033 ordinance allowing separate sale of ADUs?" There is no statewide database, adoption lists conflict between sources, and status changes quarter to quarter, so a verbal or written answer from your local planning office is the only reliable confirmation. In unincorporated Santa Clara County, start with the county's official ADU page; inside a city, ask that city directly.

Because a separate sale is legally impossible without a local ordinance, do not sign anything, pay a surveyor, or promise a buyer a standalone unit until your jurisdiction confirms it has opted in. If you are in San Jose, you already have a green light and a closed comparable sale to point to. If you are elsewhere in the Bay Area, treat renting as your base case and revisit selling if and when your city acts. Our complete Bay Area ADU guide is the best place to see how all of this fits together.

Real Bay Area projects

Whether you want to build an ADU to rent, to house family, or to position for a future separate sale in an opt-in city like San Jose, the outcome depends on getting design, permitting and construction to work as one system. That is how UniqHaus operates: architecture, interior design, 3D visualization, permitting and construction under one roof, so an AB 1033-ready project is planned for from the first drawing rather than retrofitted later. Browse our completed Bay Area projects to see ADUs and garage conversions we have delivered across Santa Clara County and nearby cities, including San Jose, Sunnyvale and Cupertino. If separate sale is your goal, we can map the build and the condo-conversion path together and tell you honestly whether your city allows it yet.

Frequently Asked Questions

Can I sell my ADU separately from my house in California?

Only if your city has passed a local ordinance opting into AB 1033 (2023). The state law does not authorize separate sales by itself; it lets each jurisdiction choose. As of 2026, San Jose is the only confirmed Bay Area city, so most homeowners in the region cannot sell separately yet. Always verify with your local planning department.

Does AB 1033 split my lot in two?

No. Your parcel is never physically subdivided. AB 1033 uses a condominium conversion: your property is legally divided into two condo units, the main house and the ADU, each with its own deed, title and property-tax bill. You sell the ADU condo and keep the main-house condo.

How much does it cost to convert an ADU into a sellable condo?

Roughly $15,000 to $40,000 in soft costs (surveyor, condo map, CC&R drafting, HOA formation, separate metering and application fees), and up to $50,000 to $75,000 if your lender imposes conditions or utility upgrades are needed. This is on top of the ADU's build cost.

Do I need an HOA and my lender's permission to sell an ADU separately?

Yes to both. Every AB 1033 conversion requires forming a new HOA to manage the shared CC&Rs, and your existing mortgage lienholder must consent before the property can be legally divided into two condos. Some mortgages restrict dividing the property, so confirm with your lender early.

What was California's first separate ADU sale under AB 1033?

A 749 sq ft ADU on Josefa Street in downtown San Jose. Its condo conversion was approved on August 14, 2025, and the standalone unit closed in early July 2026 for $530,000, the first separate, arm's-length ADU sale in California history.

Do I have to live on the property to rent or sell my ADU?

No. AB 976 (2024) permanently removed the owner-occupancy requirement for standard ADUs, so you can rent both units or sell the ADU (in an opt-in city) without living on-site. Owner-occupancy only applies to JADUs that share a bathroom with the main home, under AB 1154 effective January 1, 2026.