The short answer: Owner-occupancy rules for ADUs require the property owner to live in the main house or the ADU. Nine states verified against official sources limit it for ordinary long-term housing: California, Washington, Oregon, Colorado, Arizona, Massachusetts, Maine, Montana and Connecticut. The exception, almost everywhere, is short-term rentals, where cities can still require the owner to live on site. Outside these states, check local rules, because many places still require owner occupancy.
Last verified: October 2, 2026 ยท Written by the ADU Scope editorial team
Attention: “No owner-occupancy requirement” almost never means “no short-term rental limits.” Plan the rental use before you read the rule, because the answer is different for a long-term tenant and an Airbnb guest.
Why Owner-Occupancy Rules for ADUs Matter
Owner-occupancy rules were common in older ADU ordinances. Cities used them to reassure neighbors that the property would be managed by someone who lives there, and to discourage investors from turning single-family blocks into rental properties. They also limit your options: you cannot buy a lot, build an ADU and rent both units, and you may have trouble if you move away, take a job elsewhere or inherit the home.
The rule can also narrow the pool of future buyers, since an investor cannot buy the property outright if the owner must live there.
Questions to ask before you build
- Does my city or state require me to live in the main house or ADU?
- Does the rule apply only at the time of permit or continuously?
- Does it differ for short-term and long-term rentals?
- What happens if I sell or move out?
The Verified States at a Glance
| State | Owner occupancy for long-term use | Key limit |
|---|---|---|
| California | Cannot be required for an ADU | A JADU requires owner occupancy only if it shares a bathroom with the main house |
| Washington | Cannot be required | Applies inside urban growth areas |
| Oregon | Cannot be required for either structure | Cities may regulate vacation occupancy separately |
| Colorado | Cannot be required, with limited exceptions | Exceptions: residency at the time of application, and for short-term rental licenses |
| Arizona | No required relationship between owner and occupant; long-term rentals must be allowed | Short-term rental operators may need to reside on site |
| Massachusetts | Cannot be required for the ADU or the main home | Cities may restrict short-term rentals |
| Maine | Cannot be required | Municipalities must allow ADUs even if the owner does not live on the lot (30-A MRSA 4364-B) |
| Montana | Cannot be required | Applies to municipalities with zoning (MCA 76-2-345) |
| Connecticut | Cannot be required | No owner-occupancy requirement in C.G.S. 8-2o; towns may limit short-term rentals |
This table covers only states checked against official or near-official sources. It is not a 50-state list, and states not listed may have changed their rules.
Owner-Occupancy Rules for ADUs in California, Washington and Oregon
California. The HCD ADU Handbook (March 2026) confirms that owner occupancy cannot be required for an ADU, (Gov. Code section 66315). It also notes a change from AB 1154 in 2025: a JADU requires the owner to live on the property only if the JADU shares a bathroom with the main house. Cities may require rentals to be longer than 30 days, and AB 1154 (Gov. Code section 66333) bars short-term rental of JADUs.
Washington. According to the Municipal Research and Services Center, local governments inside urban growth areas cannot require owner occupancy for ADUs under RCW 36.70A.680 and .681.
Oregon. ORS 197A.425 excludes owner-occupancy requirements from “reasonable local regulations” for either structure, but lets local governments regulate vacation occupancies separately, including requiring owner occupancy or parking for those uses.
Tip: If you plan a JADU in California, check whether it will share a bathroom with the house. If it does, the owner-occupancy requirement may apply; if it has its own bathroom, it likely does not under the 2025 change, but confirm with your city.
Owner-Occupancy Rules for ADUs in Colorado, Arizona and Massachusetts
Colorado. DOLA’s summary of HB24-1152 says covered jurisdictions cannot require owner residence in either the main dwelling or the ADU. The limited exceptions are owner residency at the time the application is filed, and owner occupancy for short-term rental licenses or permits.
Arizona. HB 2720 bars cities with more than 75,000 residents from requiring a family, marital or employment relationship between owner and occupant, and requires them to allow long-term rentals. Short-term rental operators may need to live on site for ADUs built after the effective date, and other state law allows owner-occupancy requirements for short-term rentals in ADUs with a certificate of occupancy or final approval on or after September 14, 2024 (A.R.S. section 9-500.39).
Massachusetts. The state regulation for protected-use ADUs, 760 CMR 71.00, expressly prohibits “a requirement that either the Protected Use ADU or the Principal Dwelling be owner-occupied” (section 71.03(2)(a)). Separately, General Laws chapter 40A, section 1A caps a protected-use ADU at the smaller of half the main dwelling’s floor area or 900 sq ft, and municipalities may restrict or prohibit short-term rentals under General Laws chapter 64G.
Maine and Montana. Maine’s 30-A MRSA section 4364-B requires municipalities to allow ADUs even if the owner does not live in a dwelling unit on the lot. Montana’s MCA 76-2-345 bars municipalities with zoning from requiring that the home or the ADU be occupied by the owner.
New Hampshire and Vermont do not fit the pattern. New Hampshire (RSA 674:72) lets a municipality require the owner to occupy one of the two units, and Vermont’s mandate (24 V.S.A. section 4412) covers ADUs on owner-occupied lots, so its state protection depends on the lot being owner-occupied.
A pattern worth noticing
Most of these states draw the same line: long-term housing is protected, while short-term rentals are open to local restriction. If your business plan depends on nightly rentals, the state ADU law will not help you.
Maryland and States Not Verified
Maryland passed HB 1466, effective October 1, 2025, with local laws due October 1, 2026. It is not a by-right law, and it limits ADUs to 75% of the main home. The statute does not itself address owner occupancy, which appears to be left to local law, so Maryland is left out of the table. Check the ordinance your county adopts.
For Texas and Florida, no confirmed statewide by-right mandate was found. Without one, owner occupancy depends on the city, and many municipalities still require it. Do not assume either state follows the pattern above.
For any other state, the safest approach is to ask three questions in writing to the planning department: Is owner occupancy required for the ADU or the main home? Does it apply to short-term rentals? What is the penalty if the rule is broken?
Attention: Many “ADU rules by state” websites list owner occupancy as a single yes or no for the whole state. That is often misleading, since local governments may differ. Always confirm with the city.
What Happens If You Break an Owner-Occupancy Rule
In places where the rule exists, enforcement is usually complaint-driven. The city may issue a notice of violation, require you to restore compliance, fine you or, in some places, revoke the ADU’s permit. Some ordinances require the owner to record a deed restriction or sign an affidavit when the permit is issued, which creates a record a future buyer or lender will see.
This varies a lot, so no typical penalty can be given. If you are unsure, ask the city for the specific code section and the enforcement process.
Frequently Asked Questions
Can I rent both the house and the ADU?
In states without an owner-occupancy requirement, generally yes for long-term rentals. Short-term rentals may be restricted.
Does California require me to live on the property?
Not for an ADU. For a JADU, only if it shares a bathroom with the main house.
Can a city require owner occupancy for an Airbnb ADU?
Yes, in several states, including Oregon, Colorado and Arizona, local or state rules allow this for short-term rentals.
Is Massachusetts different?
Its regulation bars owner-occupancy requirements for protected-use ADUs, but cities can restrict short-term rentals.
Next Steps
- ADU Laws by State: A 50-State Overview
- California ADU Laws 2026
- Arizona ADU Law: What Cities Must Allow Under HB 2720
- Washington State ADU Law: What Homeowners Can Build
- Oregon ADU Rules: Statewide Requirements and Portland Specifics
- Colorado ADU Law 2026: What HB24-1152 Means for Homeowners
General information, not legal advice. Local rules vary and change; confirm with your planning department.
Sources: HCD ADU Handbook, March 2026 ยท MRSC: Accessory Dwelling Units ยท ORS 197A.425 ยท Colorado DOLA ยท Arizona HB 2720 summary ยท 760 CMR 71.00 (Massachusetts) ยท 30-A MRSA 4364-B (Maine) ยท RSA 674:72 (New Hampshire) ยท A.R.S. 9-500.39