New York's Plus One ADU program puts up to $125,000 toward building a legal accessory apartment in your home — a basement suite for your parents, an in-law apartment, or a legal rental. We check your eligibility and your town's rules in one free walkthrough.
Program status — verified September 2026
Plus One ADU is state money, but it is run town by town and each town's intake opens and closes on its own schedule. On Long Island right now: Huntington and Riverhead are accepting applications. Brookhaven, Islip and Southold are closed. Babylon, East Hampton, Shelter Island and Southampton run their programs through Community Development Long Island instead of the Long Island Housing Partnership.
The $125,000 is a cap, not an amount every applicant gets. Huntington's published guidelines require household income at or below 100% of Nassau/Suffolk area median income (2023 HUD limits: $109,400 for one person, $156,300 for four), and that you have owned and lived in the home for at least a year. We will tell you your town's actual status on the walkthrough — and if the grant is closed where you live, we will tell you what the project costs without it rather than let you wait on a round that may not reopen.
We visit your home, look at the basement, garage, or addition space, and check two things on the spot: whether your town's rules allow it, and whether you fit the grant's homeowner and income criteria.
We prepare the design (you see it in 3D before anything is built), assemble the grant application, and file the full permit package — including the Zoning Board hearing where your town requires one.
Licensed, insured crew builds the apartment start to finish — kitchen, bath, entrance, egress, inspections. You get a legal, rentable, code-compliant unit.
Babylon, Brookhaven, Smithtown, and Huntington each set their own size, parking, and occupancy rules. We researched them town by town:
Answer four questions and we'll tell you straight — whether the grant fits, whether your town allows it, and what it would realistically cost. Free walkthrough, honest answer, no pressure.
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