Can I Add an ADU to My Staten Island or Brooklyn Home in 2026?

Yes – in 2026 you can add an accessory dwelling unit (ADU) to most one- and two-family homes on Staten Island and in Brooklyn. New York City\u2019s City of Yes for Housing Opportunity, passed by the City Council on December 5, 2024, legalized backyard cottages, garage conversions, and basement or cellar apartments citywide. For the detached and semi-detached homes that define Staten Island and southern Brooklyn, this is one of the biggest changes to hit homeowners in a generation. Here is what it means for your home, your rental income, and your future sale price.

What exactly is an ADU under the new NYC rules?

An accessory dwelling unit is a second, smaller home on the same lot as your main house. Under the City of Yes framework, ADUs generally must be 800 square feet or less and sit on a lot with a one- or two-family home. Three common types now have a clearer legal path: a detached backyard cottage, a converted garage, and a basement or cellar apartment brought up to code. Local Law 126 also created a ten-year process to legalize many pre-existing basement and cellar apartments that were occupied unlawfully. The upshot is simple: space you already own may now be turned into a legal, income-producing unit.

Is there money to help pay for an ADU?

Yes, and this is the fresh news for 2026. The state and city Plus One ADU Program offers eligible homeowners up to $395,000 in financing to design and build an ADU, and it reopened for new applications in March 2026 for the first time since its original intake closed two years earlier. Between that program and the new zoning, the math on adding a unit has shifted meaningfully. With 30-year mortgage rates hovering around 6.5% in mid-June 2026, a rented ADU can offset a real chunk of a monthly payment.

If you own on Staten Island, here is what is different

Staten Island is built for this. The borough is dominated by one- and two-family detached homes on private lots – exactly the housing type the new ADU rules target. Many South Shore and Mid-Island properties in neighborhoods like Huguenot, New Dorp, Eltingville, and Great Kills have driveways, detached garages, and backyards with room for a cottage or a garage conversion. The most common Staten Island play is a finished, legalized basement unit or a garage-to-studio conversion that a multi-generational family can use or rent. Off-street parking – which Staten Island has in abundance – removes one of the biggest hurdles other boroughs face. Before you build, you still need to confirm your zoning district, lot coverage, and the certificate of occupancy, which is where having an agent who knows the local product type pays off.

If you own in Brooklyn, here is what is different

Brooklyn has quietly become the epicenter of NYC\u2019s ADU movement, with the highest concentration of potential in lower-density, larger-lot neighborhoods like Flatlands, Canarsie, Bensonhurst, Mill Basin, and East New York. These southern Brooklyn areas look a lot like Staten Island – detached and semi-detached homes with yards and driveways – so the same backyard-cottage and garage-conversion strategies apply. The difference is land value and rent: with Mill Basin\u2019s median sale price at $1.2M in May 2026 and strong rental demand across southern Brooklyn, an income unit can carry an outsized financial impact. In the denser, attached-rowhouse parts of Brooklyn, the realistic ADU path is usually a legalized basement or cellar apartment rather than a freestanding cottage.

Does an ADU actually add resale value?

It can, in two ways. First, the rental income itself – a legal unit renting at market rate improves your monthly cash flow today. Second, and often overlooked, a legal income unit widens your future buyer pool. When you sell, you attract both owner-occupants who want help covering the mortgage and investors who want the cash flow. That broader demand is what drives competitive offers. The key word is legal: an unpermitted basement apartment can become a liability at sale, while a properly permitted ADU is an asset you can market. Joseph Ranola helps homeowners on both sides of the harbor weigh the cost to build against the rent and resale value the unit would add, so the decision is based on numbers, not guesswork.

How do I find out if my home qualifies?

Start with your lot. Confirm whether your home is a one- or two-family, check your zoning district, and look at whether you have the yard, garage, or basement to work with. Then run the numbers: build cost, available Plus One financing, expected rent, and the value at resale. Joseph Ranola serves Staten Island and Brooklyn and can walk you through whether an ADU makes sense for your specific property and your timeline. Call or text (917) 905-2541 or email [email protected].

For more, see our guides on multi-family homes in Huguenot, Staten Island and the Mill Basin, Brooklyn market, or start on the work with me page.