ADUs are allowed in Town Of IslipTypes:Internal
Types:Internal
Accessory Dwelling Unit (ADU) Rules for Town Of Islip, NY
Is your property eligible for an ADU?
# of Properties
89,811
Owner-occupied
84%
Zoning districts
65
Avg Home Value
$44,787
Median Lot Size
0.26 acres
Avg Income
$141,169
Residential Types:
89,811 housing units
2-3 Family
91%
Apts (4+ units)
5%
Other
4%
Zoning Districts:
94,736 parcels · 65 districts
B
33%(31,356)
A
31%(29,430)
AA
13%(12,380)
CA
3%(2,972)
Other
20%(18,598)
ADU Rules
What can you build in Town Of Islip, NY?
Town Of Islip, 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: Not addressed in the local bylaw
Interior / Attached ADU Size Limits
- –Maximum size of 800 sq ft
- –Maximum size of 50% of the principal dwelling’s gross floor area (including the ADU area)
Max Units
- –1 accessory apartment per lot (in single-family dwelling).
- –Detached ADU: 0 per lot; Two-family/multifamily principal structures: 0 per lot.
- –JADU: none specified.
Owner Occupancy
- –Owner must reside in the principal dwelling unit.
Parking
- –4 off-street spaces per lot with an ADU; no max; at least 2 spaces must exit freely; subject to Town Engineer review and residential driveway limits (driveway parking only; no more than 40% of front yard may be paved).
Rental Restrictions
- –Principal dwelling may not be rented; only the accessory apartment may be occupied by tenants (tenants limited to the accessory unit).
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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