ADUs are allowed in PlainfieldTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Plainfield, NJ
Is your property eligible for an ADU?
# of Properties
10,098
Owner-occupied
46%
Zoning districts
41
Avg Home Value
$125,274
Median Lot Size
0.17 acres
Avg Income
$100,336
Residential Types:
10,098 housing units
Single Family
5%
Apts (4+ units)
6%
Condos
1%
Other
87%
Zoning Districts:
10,752 parcels · 41 districts
R-3
37%(3,997)
R-4
28%(3,054)
R-2
11%(1,168)
MU
3%(312)
Other
21%(2,221)
ADU Rules
What can you build in Plainfield, NJ?
Plainfield, 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
Detached ADU Size Limits
- –Maximum detached ADU ground area is 35% of the principal structure’s ground area.
Owner Occupancy
- –Either the primary dwelling or the ADU must be owner-occupied
Parking
- –1 space/ADU; waiver within 0.5 mi of a train station
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.
Union County