ADUs are allowed in Town Of SoutholdTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Town Of Southold, NY
Is your property eligible for an ADU?
# of Properties
15,950
Owner-occupied
26%
Zoning districts
20
Avg Home Value
$6,483
Median Lot Size
0.53 acres
Avg Income
$119,354
Residential Types:
16,919 housing units
2-3 Family
86%
Apts (4+ units)
13%
Condos
1%
Zoning Districts:
17,665 parcels · 20 districts
R-40
65%(11,547)
R-80
12%(2,144)
AC
10%(1,747)
R-120
2%(430)
Other
10%(1,797)
ADU Rules
What can you build in Town Of Southold, NY?
Town Of Southold, NY follows state and local rules for Accessory Dwelling Units. Here is a concise overview of the local rules.
Eligibility
- –Internal / Attached ADU: By Right
- –Detached ADU: Special Permit
Interior / Attached ADU Size Limits
- –Maximum size: 25% of the dwelling’s habitable space; in the Affordable Housing District, 50% of the MIFDU’s total square footage.
Detached ADU Size Limits
- –Maximum size of 750 sq ft of livable floor area for a detached accessory apartment
Max Units
- –Single-family and Hamlet Density districts: 1 ADU per lot.
- –AHD (MIFDU projects): 1 ADU per MIFDU; not more than 50% of dwelling units may have ADUs.
Owner Occupancy
- –Owner must occupy either the principal dwelling or the ADU.
Parking
- –1 space per accessory apartment (in addition to 2 for the dwelling; total 3 for a 1-family with ADU). Exceptions: driveway may count as 1; spaces may be on-site or within 200 ft under deed restrictions; AHD MIFDU requires 1 off-street space; A-C district requires 3 spaces for a 1-family with ADU; Hamlet Business District waiver possible if municipal parking within 300 ft.
Rental Restrictions
- –Detached ADU: year-round lease 1–2 years to a family member or Registry-eligible resident; rents for Registry tenants capped by Town; rental permit required.
- –Attached ADU: year-round lease 1+ year; rental permit required.
ADU State Law
What can you build in New York?
- –New York does not have a statewide ADU law; all ADU rules are set by individual municipalities.
- –ADUs may also be referenced as "accessory apartments" or "accessory living units," and definitions are not standardized statewide.
What's allowed on your lot?
These are the municipality-wide rules. What's allowed on a specific property also depends on state laws, setbacks, floor area ratio, lot coverage, environmental constraints, topography, and other property-specific factors. Search your address on FutureLot to see what's allowed on your property.
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ADU rules in other New York municipalities
Rules change at the town line. Check the municipality your property is actually in.
Suffolk County
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