ADUs are allowed in Pennington BoroughTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Pennington Borough, NJ
Is your property eligible for an ADU?
# of Properties
1,050
Owner-occupied
86%
Zoning districts
15
Avg Home Value
$469,857
Median Lot Size
0.29 acres
Avg Income
$188,009
Residential Types:
1,050 housing units
2-3 Family
92%
Other
8%
Zoning Districts:
1,155 parcels · 15 districts
R-80
49%(566)
R-100
26%(297)
MR
7%(82)
TC
6%(65)
Other
13%(145)
ADU Rules
What can you build in Pennington Borough, NJ?
Pennington Borough, NJ 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: By Right
Interior / Attached ADU Size Limits
- –Maximum gross floor area of 800 sq ft for an internal or attached affordable accessory apartment
Detached ADU Size Limits
- –Maximum ADU size of 800 sq ft (applies in R-80 and R-100 only)
Max Units
- –Single-family detached (R-80/R-100): 1 affordable accessory apt/lot
- –Duplex/multifamily & other zones: 0
- –Borough-wide cap: 6 total
Parking
- –1 off-street space per ADU; no maximum; applies only to affordable accessory apartments; cannot reduce required spaces for the principal dwelling (R-80 and R-100 districts).
Rental Restrictions
- –ADUs must be rented only to low-income households for at least 10 years under a recorded deed restriction; rents and annual increases must be affordable to low-income households (including a utility allowance) and set by an administrative entity.
ADU State Law
What can you build in New Jersey?
- –New Jersey does not have a statewide ADU mandate; ADU rules are set by individual municipalities.
- –Building/fire codes are set statewide, but whether an ADU is allowed is local zoning.
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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Is your property eligible for an ADU?
ADU rules in other New Jersey municipalities
Rules change at the town line. Check the municipality your property is actually in.
Mercer County