Huntington, NY Accessory Structures: ADU Rules (2026)

Section 198-133(A)(1) makes an accessory dwelling unit a conditional use in residence districts, available only by permission of the Zoning Board of Appeals after compliance with the Article, the Town Code, the state Fire Code and Property Maintenance Code, the Residential Code of New York State, and any other agency's rules; the ZBA reviews the article's own factors instead of the chapter's general conditional-use standards. Section 198-134(A) lists the conditions a permit applicant must satisfy: the lot needs a minimum 5,000 square feet and 50 feet of frontage, and under (A)(3), occupancy is capped at one person per seventy square feet of habitable bedroom space, with children under five excluded from the count, while the unit itself must run between 300 and 650 square feet of habitable space and cannot exceed two bedrooms.

Subsection (A)(4) bars a new front entrance door and requires other exterior doors, meters, and panels to stay off the street-facing side so the building keeps its single-family appearance. Subsection (A)(7) sets parking at two off-street spaces for a one-bedroom accessory unit occupied by a non-owner and three for a two-bedroom unit, with driveway width capped at eighteen feet or twenty-four percent of lot frontage. Section 198-133(B)(1) makes operating, renting, or advertising a unit without a valid permit unlawful outright, and (C) creates a rebuttable presumption of illegal multi-family occupancy where two or more listed features, such as a second gas meter, a second mailbox, or a separate lease, are found on the premises.