Big changes to ADU Laws in San Diego, Ca
Moving to San Diego, California? This New Law Might Change Your Mind
Big change: ADUs can now be sold separately
As of August 22, 2025, San Diego adopted California's AB 1033, allowing accessory dwelling units, or ADUs, to be sold separately from the main house. Think of it as condoizing a single family lot. A backyard granny flat can become its own legal property, with separate ownership. That shifts how neighborhoods are built, bought, and sold in the city.
What AB 1033 actually does
An ADU is a smaller, secondary dwelling on the same lot as a single family home. Under AB 1033 in San Diego city limits, homeowners can split an ADU off and sell it as its own unit, rather than only renting it out. The split requires a condo style ownership structure, shared property rules, and lender approval if there is an existing mortgage.
Why some people are excited
More housing options. Smaller detached units can sell at lower price points than full single family homes, creating new entry points for buyers in a high priced market.
Greater flexibility for homeowners. Instead of renting an ADU long term, a homeowner could sell it to pay down a mortgage, fund renovations, or sell to a family member who wants to live nearby.
Moves toward affordability. While "affordable" in San Diego is relative, smaller units generally mean smaller prices, which can help more buyers gain a foothold in desirable neighborhoods.
Why others are concerned
Density and privacy changes. Backyard units becoming separate homes can change the single family feel of neighborhoods, increasing on street parking demand and reducing private yard space.
Market uncertainty. It is unclear whether ADU ownership will boost or hurt property values. Buyers may prize the flexibility, or they may avoid areas where lots have been repeatedly split.
Legal complexity and costs. Selling an ADU is not as simple as listing it. Expect to set up CC&Rs and shared property agreements, get lender consent if there is an existing loan, and hire professionals. That means legal fees, paperwork, and transaction costs.
How this affects people moving to San Diego
If you want a classic single family neighborhood, this law matters. You could buy into what looks like a quiet block, only to have a neighbor later build an ADU and sell it. That new household can change parking, privacy, and the feel of the street.
On the flip side, if you have been priced out, separately sold ADUs could be your entry point into neighborhoods that were previously out of reach. Smaller detached units let buyers live close to job centers, transit, and amenities without paying for a full sized home.
Where the law applies
AB 1033 has been adopted inside San Diego city limits only. Nearby suburbs such as Chula Vista, Poway, San Marcos, and Carlsbad have not adopted the law, so ADUs there remain primarily for rental use. If you prefer a more traditional single family feel with fewer potential surprises, these suburbs may be a better fit.
Practical checklist for buyers and homeowners
Confirm city limits. Make sure the property is inside San Diego city limits if ADU sale potential matters to you.
Ask about ADU plans. If a property or neighbor has an ADU, ask whether there are plans to convert it to separate ownership.
Review CC&Rs and shared agreements. If an ADU has been split off, read the condominium style documents that govern shared spaces and responsibilities.
Talk to lenders early. Existing mortgages may require lender approval before an ADU can be separated. Speak with a mortgage professional before assuming a split is possible.
Consider parking and neighborhood character. More units usually mean more cars. Visit at different times to see street parking and neighborhood activity.
Budget for transaction costs. Legal setup for separate ownership is not free. Expect attorney and recording fees, and factor them into the decision.
Quick FAQ
Can an ADU still be rented?
Yes. Selling an ADU is an additional option, but ADUs can continue to be used as rental units if the owner prefers.
Does the law automatically split ADUs?
No. The owner must go through a legal process to create a condo style ownership setup, including CC&Rs and agreements for shared property. Lender approval may also be required.
Should I avoid San Diego because of this law?
That depends on your priorities. If maintaining a traditional single family neighborhood feel is essential, consider looking outside city limits. If access to smaller, more affordable detached homes in city neighborhoods appeals to you, the new law could be an advantage.
Final thoughts
Allowing ADUs to be sold separately is a major change for San Diego. It creates new housing choices and financial flexibility for homeowners, while also introducing questions about density, privacy, and market behavior. If you are moving to the area, make this law part of your decision checklist when choosing neighborhoods. Know where you want to live, and what trade offs you are willing to accept between affordability and the traditional single family feel.
Keywords: San Diego real estate, AB 1033, ADU, accessory dwelling unit, sell ADU separately, moving to San Diego, San Diego housing
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