ADUs in San Jose in 2026: what changed, and why you can now sell one

Backyard homes, or ADUs, are now a normal part of San Jose. The city issued 10 ADU permits in 2015 and 488 in 2024 (City of San Jose). If you have one, are thinking about one, or are selling a home that has one, a few recent changes matter.

You can now sell an ADU separately in San Jose

A state law, AB 1033, lets cities allow an ADU to be sold on its own, as a condominium, separate from the main house. San Jose was the first city in California to opt in, in 2024. The city explains the steps on its ADU condominium conversions page: a parcel map, a condominium plan, an HOA and CC&Rs.

In June 2026 the first ADU sold this way in California closed in San Jose: a 749 square foot, two bedroom home for $530,000, with city permitting taking about 60 days (City of San Jose announcement).

What this means for you: an ADU can now be a way to sell part of your property and keep your main home. It is a real legal and financial project, so it fits owners who plan ahead, but for the first time it is an option.

Unpermitted ADUs can be legalized

Many older homes have a converted garage or back unit that was never permitted. Since 2025, a state law (AB 2533) says a unit built before January 1, 2020 can be legalized, and the city can only refuse if it is truly unsafe. Owners can also ask to delay code enforcement for five years while they fix things. San Jose runs an ADU and JADU legalization program, and the county has its own for unincorporated areas (Santa Clara County program).

For sellers this matters a lot. An unpermitted unit has to be disclosed, and buyers and lenders often discount it. Legalizing it before you list can turn a question mark into square footage.

Other changes worth knowing

• Smaller fees for smaller units. ADUs of 750 square feet or less are exempt from impact fees, and since January 2026, units under 500 square feet are also exempt from school fees.
• Quicker paperwork. Since January 2026, a city has 15 days to say whether an ADU application is complete, or it is treated as complete.
• Parking. You do not have to replace an uncovered parking space you turn into an ADU.
• Junior ADUs. Owner occupancy can only be required when the junior unit shares a bathroom with the main house.

San Jose also keeps a list of pre-approved ADU designs from more than 30 vendors, which can make permitting simpler. Start on the city's ADU page. The state keeps its own guide at HCD's ADU page.

What an ADU does to your property tax

Adding an ADU does not reassess your whole home. The Santa Clara County Assessor adds only the value of the new unit, and the existing house keeps its current assessed value (County Assessor on ADUs).

If you are selling a home with an ADU

Buyers pay attention to three things: whether it is permitted, whether it is rented and on what terms, and whether it could be sold separately in the future. I put those answers in front of buyers before they ask. If your home has an ADU, or room for one, call me and we will talk through what it adds to your price.

I am a REALTOR®, not an attorney or a planner. Sources: City of San Jose ADU condominium conversions, City of San Jose, June 2026, City of San Jose AB 2533 program, HCD and Santa Clara County Assessor. Checked September 2026. Laws and city rules change, so confirm with the city before relying on anything here.