ADU Questions · 2026
Can I Live in My ADU and Rent Out My Main House?
Yes. For a standard ADU, California state law does not require you to live in either unit, so you’re free to move into the ADU and rent out your main house, do it the other way around, or rent out both at once. The one exception is a Junior ADU (JADU) that shares a bathroom with the main house, which does require the owner to live in one of the two units.
The short version: You can live in your ADU and rent out your main house. State law removed owner-occupancy requirements for standard ADUs, and cities cannot bring that requirement back. Only a bathroom-sharing JADU still requires the owner to occupy the JADU or the primary home.
Why this is legal statewide
Older ADU rules in many California cities required the owner to live on the property, usually in the main house, as a condition of keeping a second unit. State lawmakers removed that requirement for standard ADUs to make it easier for homeowners to actually use the extra space, whether that means housing family, generating rental income, or simply living smaller.
Because this is state law, it applies the same way in every California city and county, including everywhere in Framework First’s service area. A local jurisdiction cannot bring back an owner-occupancy requirement for a standard ADU, no matter what its older municipal code says. If your city’s website still lists an owner-occupancy rule for ADUs, that language is outdated and unenforceable for a standard unit.
This means the living arrangement is entirely up to you:
- Live in the ADU, rent out the main house.
- Live in the main house, rent out the ADU.
- Rent out both units and live elsewhere entirely.
- Move between the two as your life changes, without asking permission or refiling anything.
The one exception: a bathroom-sharing JADU
A Junior ADU, or JADU, is a small unit of up to 500 square feet built within the existing walls of a single-family home, often using an efficiency kitchen instead of a full one. Because a JADU can share a bathroom with the main house, state law keeps an owner-occupancy requirement in that specific case: the owner must live in either the JADU or the primary home.
That requirement exists because a shared bathroom ties the two units together in a way a fully independent ADU is not. If your JADU has its own dedicated bathroom rather than a shared one, confirm with your local planning department and your feasibility study whether the owner-occupancy requirement still applies to your specific plan, since local interpretation can vary here. For a full side-by-side comparison of the two unit types, see our guide on JADU vs. ADU.
| Standard ADU | JADU (bathroom-shared) | |
|---|---|---|
| Owner-occupancy required? | No | Yes, owner lives in the ADU or main house |
| Can you rent out the whole property? | Yes | No |
| Typical size | Up to 1,200 sq ft | Up to 500 sq ft |
| Where it’s built | Detached in the yard, or attached | Inside the existing home’s walls |
What this means in practice
Because a standard detached ADU carries no owner-occupancy string attached, it works cleanly for a few common situations:
- Downsizing while keeping the property. Move into a smaller, easier-to-maintain ADU and rent the larger main house for income.
- Multigenerational flexibility. House a family member in the ADU today, then swap who lives where later as needs change, without a permitting issue.
- Pure investment. Some owners build the ADU specifically to rent out, while living in the main house, or rent both and live somewhere else entirely.
One thing to check separately: short-term rental rules (think Airbnb-style stays under 30 days) are not set by one single statewide law. They vary by city and county, and some jurisdictions in our own service area, including parts of unincorporated Santa Cruz County, require ADU rentals to run 30 days or longer. Confirm your specific city or county’s short-term rental rules before planning around nightly rental income. Our guide to California ADU rental laws covers this in more depth.
Building with Framework First around your living plan
Because owner-occupancy isn’t a factor for a standard ADU, your Framework First unit can be designed around whichever living arrangement actually fits your life, now or later. Our 14 models range from 405 to 1,200 square feet, with all-inclusive pricing from $180,000 to $557,000 that includes a permitting budget along with plans, foundation, the factory build, delivery, utility hookups, appliances, and final inspection. Exact permit costs are set by your city and county, so we confirm them for your address during the feasibility study, and property-specific site work like septic upgrades or retaining walls isn’t part of listed model pricing, though we build it in-house under the same contract when a lot needs it. You can browse the full lineup on our models page or run your own numbers with the ADU calculator.
If your plan involves a JADU instead of a standard ADU, or you’re not sure which one fits your lot, our feasibility study confirms what you’re allowed to build and how the owner-occupancy rule applies to your address before you commit to a design.
Frequently asked questions
Do I have to live in my main house to build an ADU?
No. For a standard ADU, state law does not require you to live in the main house, the ADU, or anywhere on the property. You can rent out the primary home and live in the ADU, or the reverse, with no owner-occupancy paperwork required.
Can I rent out my main house and my ADU at the same time?
Yes, for a standard ADU. Since owner-occupancy is not required, you can rent both units simultaneously and live elsewhere. This differs from a JADU that shares a bathroom with the main house, which requires the owner to occupy one of the two units.
Does building a JADU change my living requirements?
Yes, if that JADU shares a bathroom with the main house. In that case, the owner must live in either the JADU or the primary home, and you cannot rent out the entire property. Read more in our JADU vs. ADU comparison.
Can I move between the main house and the ADU over time?
Yes. Because there’s no ongoing owner-occupancy requirement to track for a standard ADU, you can switch which unit you live in and which one you rent out as your circumstances change, without needing to notify the city.
Does my city get to add its own owner-occupancy rule?
No. Owner-occupancy for standard ADUs is set by state law, and local jurisdictions cannot override it with a stricter local requirement. If you see conflicting information on a city website, treat the state rule as controlling and confirm with your local planning department or your feasibility study.
Ready to see how this works for your property? Start a feasibility study and we’ll confirm exactly what you can build and how you’re free to live in it.