Accessory Structures in Southampton, NY (2026)
4 verified accessory structures rules for Southampton, New York, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
In the Town of Southampton outside the villages, building an accessory apartment requires a building permit from the Town Building Department under Town Code § 330-11.1 and compliance with the special standards of § 330-11.2. The owner must occupy the principal dwelling or the apartment, only one accessory apartment is allowed per lot, and the lot generally must be at least 30,000 square feet.
Southampton Accessory Apartment Zoning Rules
Some RestrictionsSouthampton Town Code §§ 330-11.1, 330-11.2
§ 330-11.1. Building permit; filing fees; approval. ... A. In order to construct an accessory apartment, the applicant shall apply for and receive a building permit from the Town Building Department in the manner of all other applications for building permits. ... ... § 330-11.2. Special standards. ... A. Owner occupancy required. The owner or owners of the lot upon which the accessory apartmen...
ADU Owner Occupancy
In the Town of Southampton outside the villages, an accessory apartment is only legal if the lot owner lives on site. Town Code Section 330-11.2A requires the owner to occupy the principal dwelling or the accessory apartment as a domicile, with narrow nonprofit-housing exceptions.
Southampton ADU Owner-Occupancy Rule
Significant RestrictionsSouthampton Town Code § 330-11.2A
Owner occupancy required. The owner or owners of the lot upon which the accessory apartment is located shall reside within the principal dwelling or the accessory apartment, and said dwelling or apartment shall be considered the owner's domicile or principal place of abode. No other owner or owners shall own a larger percentage, collectively or individually, than the owner-occupant. Nothing wit...
ADU Rental Restrictions
In the Town of Southampton outside the villages, an accessory apartment approved after January 1, 2019 cannot rent for more than the Suffolk County fair market rent set by HUD, per Town Code § 330-11.1E. The tenant must also meet the low-moderate or middle-income standards of Chapter 216, verified when the rental permit is issued or renewed under Chapter 270.
Southampton Accessory Apartment Rent Cap
Significant RestrictionsSouthampton Town Code §§ 330-11.1E, 330-11.2M
E. A rental permit in accordance with Chapter 270 of the Town Code must be issued prior to the occupancy of an accessory apartment. For those accessory apartments receiving building permit approval after January 1, 2019, at the time of application for a rental permit, or at the time of renewal of the permit, the owner shall provide a fully executed lease agreement or other documentation that de...
Shed & Carport Rules
In the Town of Southampton outside the villages, a residential storage shed is capped at 120 square feet and 12 feet in height with no external illumination under Town Code § 330-5. It needs no building permit, only an owner's certification of zoning compliance under § 123-8, but must meet a 10-foot side and rear yard setback on lots of 80,000 square feet or less under § 330-77E.
Southampton Storage Shed Size and Setback
Some RestrictionsSouthampton Town Code §§ 123-8, 330-5, 330-77E
§ 123-8. Work not requiring building permit or demolition permit. ... Notwithstanding, a residential storage shed, as defined in Town Code §330-5, shall not require a building permit but shall require an owner's certification attesting to compliance with current Town Zoning Code regulations. ... RESIDENTIAL STORAGE SHED A structure used to store household equipment (including garden equipment, ...
Looking for Suffolk County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Southampton city rules.
Accessory Structures in Suffolk County →