Renting an ADU, taxes and insurance

Can you rent out an ADU, and what will it earn?

Often you can, if your town allows rentals and you can meet its rule about who must live on the lot, which comes in several versions. The earnings are less certain: HUD puts a modest Rochester-area one-bedroom at $1,256 a month with utilities (NY DHCR, 2026), which may not cover the loan on a new cottage, as our worked example shows. If you’d rather move into the ADU and rent out the house, read the three traps first.

Once a tenant moves in, you’re also a landlord with duties under New York law, and your taxes and insurance change. Those come later in this guide.

Can your town limit who lives there?

Yes. An owner-occupancy rule means whoever owns the lot must live there. Towns near Rochester word it differently, and the wording decides whether you can move into the ADU, spend winters away, rent both units or sell to a buyer who wants to rent.

Owner-occupancy comes in different versions

Codes change, so confirm with your town. Each town page shows the code section we read and the date we checked it.

Any of these rules can shrink the pool of buyers and limit their loans, since an FHA appraiser may estimate ADU rent only if the unit can legally be rented without restrictions (HUD, 2023).

A family-only rule allows the ADU only for relatives. The Town of East Bloomfield, for example, allows at most two people related to someone in the main house (East Bloomfield code). That fits a parent’s cottage, but the unit can’t go to a paying stranger later. Our aging in place guide has more examples.

In New York: Each city, town and village sets its own ADU rules, including owner occupancy; see New York ADU rules. Grant money adds strings too. An ADU built with the state’s Plus One grant must be permanent housing, not a short-term rental, under an agreement lasting at least 10 years (NY HCR).

Ask your code office whether the rule goes on your deed and what happens if you move, sell or die. Read your deed and any homeowners association rules too, since a private restriction can ban rentals even where zoning allows them.

Will the rent cover it?

Sometimes. It depends mostly on what the ADU costs and how you pay for it, and no one can promise a rent. Converting space you already have gives you the best chance. A new detached cottage built with borrowed money often won’t cover its own loan at local rents.

Rent sources measure different things, so read them as a range:

HUD’s Fair Market Rent is its estimate of a modest rent including utilities, while the listing figures are asking rents. A new ADU with its own entrance and parking may rent toward the top of the local range. A local property manager can give you a closer estimate before you build.

A made-up example. Say you borrow the whole cost with a home equity loan at 8.56%, Bankrate’s national average for 10- and 15-year home equity loans on September 30, 2026 (Bankrate, 2026), and pay it off over 20 years. A 20-year loan may carry a different rate, so ask a lender for yours. Then set the payment against HUD’s Rochester-area one-bedroom rent.

These costs still come off the top:

• Property tax. A finished ADU raises your assessment. Ask your assessor what yours would add, and whether your community offers the §421-p exemption.
• A landlord policy, which costs about 25% more than a homeowners policy (Insurance Information Institute).
• Utilities, if your rent includes them, as HUD’s figure does.
• Upkeep: appliances, paint, heating equipment and snow clearing on the shared path.
• Empty months. One empty month a year costs about 8% of the year’s rent.
• Income tax on what’s left after expenses and depreciation (IRS Publication 527).

In this example the cottage is short every month before any of those costs, while the conversion leaves some room to pay them. Putting cash down shrinks the loan, but that cash could have earned something elsewhere. Once a loan is paid off, more of the rent stays with you.

What tends to pay best:

• Conversions. A basement, attic or garage you already own keeps the loan small. Real costs vary widely; see what an ADU costs.
• Family use that replaces another cost. If the ADU means a parent stops paying rent somewhere else, or an adult child doesn’t need an apartment, the bill your family stops paying is the return. See what will you use an ADU for?
• A rentable unit that helps a buyer qualify. Fannie Mae lets a buyer count 75% of an existing ADU’s rent, up to 30% of qualifying income (Fannie Mae Selling Guide, 2026), so a legal unit your town lets anyone rent can help the next owner borrow.

Planning to move into the ADU and rent out the house?

It can work, if your town and your lot allow it. Three things trip people up, so check each one before you build the ADU for yourself.

The wording of the owner rule. Where the owner may live in either unit, as in the Town of Canandaigua, you can move into the ADU. Where the owner must live in the main house, as in the Village of Geneseo, you can’t. Family-only wording blocks it too. The Town of East Bloomfield limits its ADUs to two people related to someone in the main house (East Bloomfield code), so once strangers rent the house, you’re not related to anyone living there.

The months-on-site rule. The villages of Avon, Churchville and Honeoye Falls, and the Town of Rush, require the owner to live on the property at least 9 months a year, which leaves about 3 months away. Spend January through April somewhere warm and you’ve broken the rule, even if you’re back every spring. Those three villages and Scottsville also allow rent on only one unit, so you can’t rent out the house and the cottage while you’re gone.

The tax break when you sell. A rental part of your property that’s separate from where you live generally doesn’t get the home-sale exclusion unless you lived in it 2 of the last 5 years (IRS Publication 523). Move into the ADU and rent out the house, and the house, usually the bigger share of the property’s value, can become that rental part. See a tax preparer before you move, not when you sell.

If the move is about growing older on your own land, building an ADU for aging in place covers the design.

What do you owe a long-term tenant?

Rent the ADU on a regular lease and you’re a landlord, with the same duties as any other landlord. Use a written lease that also says which parts of the yard, driveway and parking are shared, who clears snow and ice, and how utilities are split.

You must keep the unit safe and livable, with heat, water, and working smoke and carbon monoxide alarms. You also can’t punish a tenant for complaining about them, and a non-renewal within a year of a complaint is presumed to be payback (NY Attorney General, 2026).

In New York: A 2019 law set tenant rules for nearly every lease in the state, small ADUs included (NY Attorney General, 2019).

Fair housing. Federal law bars discrimination based on race, color, religion, sex, national origin, familial status and disability (42 U.S.C. 3604). An owner who lives in a building of four or fewer units is exempt, but a discriminatory ad is illegal even then (42 U.S.C. 3603).

In New York: The Human Rights Law protects more groups, including age, marital status, sexual orientation, gender identity, immigration status and lawful source of income, such as a housing voucher. Its owner-occupied exemption is narrower: a building for no more than two families with the owner living in one, or rooms rented in the owner’s own home (NY Executive Law §296). It’s unsettled whether a house and a detached ADU are one building, so assume the law covers your ADU rental unless a fair housing attorney says otherwise.

Describe the unit in your listing, not the tenant you want, and screen every applicant by the same written standards.

Rental permits. Many towns require a rental permit or inspection. The City of Rochester requires a certificate of occupancy, its sign-off that a building is fit to live in, for one- and two-family rentals that aren’t owner-occupied, renewed every 6 years or more often in lead high-risk areas (City of Rochester). Ask your own town or village whether you need a permit before you list the unit.

Does Good Cause Eviction apply to you?

New York’s Good Cause Eviction law took effect April 20, 2024. Outside New York City, it applies only where a city, town or village opts in (NY Attorney General). As of May 4, 2026, that included the cities of Rochester and Ithaca (NY DHCR, 2026).

Where it applies, you need a legal reason, such as unpaid rent, to evict or refuse to renew. A rent increase above 5% plus inflation, capped at 10%, is presumed unreasonable (NY Attorney General). The state’s 2026 notice uses 3.15% inflation for Monroe, Ontario and the other Finger Lakes counties (NY DHCR, 2026), so by our arithmetic the line sits near 8.15%.

Exemptions may cover an ADU, but none is automatic:

• Newer buildings. A unit whose certificate of occupancy was issued on or after January 1, 2009 is exempt for 30 years (NY Real Property Law §214). A new ADU would usually qualify if your town gives it its own certificate.
• Owner-occupied buildings with 10 or fewer units are exempt (NY Attorney General), but it’s unclear whether a detached ADU counts as part of yours.
• Small landlords. Rochester and Ithaca exempt owners of no more than one unit anywhere in New York (NY DHCR, 2026). How your own house counts isn’t spelled out.
• High rents. Rochester exempts units renting above 245% of Fair Market Rent, or $3,077 for a Monroe County one-bedroom, and Ithaca’s line is 345% (NY DHCR, 2026).

In an opt-in city, ask a landlord-tenant attorney before you sign the first lease.

Can you rent it short-term?

Only if your town allows it. Towns can require permits for short-term rentals, the Airbnb-style stays of a few nights or weeks, cap guests, require the owner to live on site or ban them outright (NYSAC, 2024).

In New York: Since March 1, 2025, sales tax applies to short-term stays costing more than $2 a day. A booking platform that handles the sale collects it. If you rent directly to guests, you generally must register and collect it yourself, unless you rent 3 or fewer days a year (NY Tax Department, 2025). Counties and towns can add an occupancy tax.

In New York: A 2025 law has counties run short-term rental registries unless they opt out, with registrations lasting 2 years. Each rental needs a posted evacuation diagram and emergency numbers, a working fire extinguisher and the liability insurance described below, and hosts keep stay records for 2 years after each calendar year ends (NY Senate, S820 of 2025).

Around Rochester:

• Monroe County voted 21-8 in December 2025 not to run a registry. Airbnb collects the county’s 6% occupancy tax (WXXI News, 2025).
• Ontario County held a public hearing in February 2026 on a proposed law to opt out of the state registry (WHEC, 2026). We couldn’t find the outcome, so ask the county whether a registry applies to you. Orleans County opted out (WHEC, 2026).
• Town of Irondequoit has required short-term rental permits since October 14, 2025. It charges a $250 application fee and a $500 permit fee, and asks for proof of insurance, a survey map, specifications for a noise-monitoring device and an inspection (WROC, 2025).
• Town of Canandaigua requires a $300 permit every year, a special use permit above 12 guests, and no permit at all above 18 (Town of Canandaigua).
• City of Rochester short-term rental rules are part of its zoning update. As of October 2026 we couldn’t confirm which rules are in force, so ask the city.

How does an ADU change your taxes?

Property tax. Expect it to rise. A finished ADU adds market value, and your assessment is based on market value (NY Tax Department). Ask your assessor when it will show up. If it looks too high, talk to the assessor when the tentative roll comes out, around May 1 in most places (NY Tax Department, 2025). The formal step is Grievance Day, usually the fourth Tuesday in May (NY Tax Department, 2026).

In New York: Under a 2024 law, Real Property Tax Law §421-p, each county, city, town, village and school district may choose to exempt part of the value a new ADU adds. The work must start after local adoption, cost more than $3,000 and be on a property for no more than two families, and up to $200,000 of added value can be exempt (NY RPTL §421-p). The five biggest city school districts, Rochester’s among them, can’t adopt it (NY Education Law §2550). You apply to your assessor by the taxable status date.

Each taxing body decides on its own, and we haven’t confirmed which ones near Rochester have adopted it, so ask your assessor. Kingston, the first city to adopt it, in August 2024, left short-term rentals out (City of Kingston, 2024).

Income tax. Rent is taxable. Rental income and expenses go on Schedule E, and a rental building is depreciated, meaning its cost is deducted bit by bit, over 27.5 years. Shared costs are split between the rental and personal parts (IRS Publication 527). Charging a relative less than a fair rent counts as personal use, which limits deductions (IRS Publication 527).

The bigger surprise comes at sale. You may exclude up to $250,000 of gain, or $500,000 for most married couples filing jointly, if you owned and lived in the home 2 of the last 5 years. A separate rental unit, like a detached ADU, usually doesn’t get that exclusion for its share of the gain unless you lived in it too, and depreciation is taxed when you sell (IRS Publication 523). See a tax preparer before you start renting, not when you sell.

What insurance do you need?

Call your insurance agent before anyone moves in. A standard homeowners policy usually doesn’t cover losses when you rent out your home. A long-term rental typically needs a landlord policy, which costs about 25% more and covers the building, your liability and lost rent after covered damage, but not the tenant’s belongings, so tenants need renters insurance (Insurance Information Institute).

Regular short-term renting is treated as a business and may need commercial or bed-and-breakfast style coverage (Insurance Information Institute).

In New York: The short-term rental law requires at least $300,000 of liability coverage for injuries and property damage to others, and a booking platform’s equal or greater coverage satisfies it (NY Senate, S820 of 2025). That’s a floor for liability only. It doesn’t insure the building, so you still need property coverage that fits a rental.

Also ask whether the ADU counts as part of the house or as an “other structure,” whether that limit would rebuild it, whether a rent-free relative changes anything, and whether you need an umbrella policy.

Will an ADU raise your home’s value?

Often, but no one can promise it, and there’s no solid data for upstate New York. In California, the 2023 median appraised value for purchases of homes with an ADU was $1,064,000, against $715,000 without (FHFA, 2025). Those homes may also have bigger lots or better locations, so the gap doesn’t measure what an ADU adds.

You’ll also see claims that an ADU adds 35% to a home’s value. That figure traces to a Porch.com comparison of asking prices in large US cities, reported by the National Association of Realtors’ magazine (Realtor Magazine, 2021). It compares listings, not what an ADU adds to a given house, and says nothing about upstate New York.

What tends to matter at resale:

• Legality. A permitted ADU with a certificate of occupancy reassures buyers, lenders and appraisers. An unpermitted one can drive them off.
• Few strings. Owner-occupancy and family-only rules shrink the pool of buyers and can limit their loans.
• Lending rules. Fannie Mae lets a buyer living in a one-unit home count 75% of one existing ADU’s rent, up to 30% of qualifying income (Fannie Mae Selling Guide, 2026). See paying for an ADU.
• Nearby sales. Where few homes with ADUs have sold, as in much of upstate New York, an appraisal may not credit the full cost of building one.

You usually can’t sell the ADU by itself. It shares a lot and tax parcel with the house, so a separate sale would need a lot split or a condominium conversion, which many local codes don’t allow. Ask a real estate attorney what your town permits.

What this means for you

• Pick the use first. Family, long-term and short-term use each bring different rules. Check your town’s rules or start with the property checker.
• Read the exact owner rule. Which unit you must live in, how many months a year, whether you can rent both, and what happens when you sell.
• Run the numbers before you build. Set a loan payment against local rent, then take off taxes, insurance, upkeep and empty months.
• Moving into the ADU yourself? Check the owner rule’s wording, any months-on-site rule and the home-sale tax break first.
• Ask your town about rental permits and short-term rentals, and ask your assessor about §421-p.
• Budget for a higher tax bill. An exemption softens it only if your community offers one and you apply on time.
• Call your insurance agent before move-in and get coverage in writing.
• See a tax preparer before you rent, especially for a detached ADU.
• See a lawyer about Good Cause Eviction, fair housing exemptions, or a deed or homeowners association restriction.
• Keep it permitted. A legal ADU protects your resale value.

General information, not legal, tax or financial advice. Your municipality decides what can be built, and a professional should review decisions about money and contracts.