ADUs are allowed in Watchung BoroughTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Watchung Borough, NJ
Is your property eligible for an ADU?
# of Properties
2,210
Owner-occupied
84%
Zoning districts
25
Avg Home Value
$1,054,157
Median Lot Size
1.42 acres
Avg Income
$163,847
Residential Types:
2,210 housing units
Single Family
6%
2-3 Family
88%
Apts (4+ units)
4%
Condos
2%
Zoning Districts:
2,308 parcels · 25 districts
R-R
67%(1,551)
R-B
15%(337)
R-A
6%(131)
R-M-L-VI
2%(44)
Other
11%(245)
ADU Rules
What can you build in Watchung Borough, NJ?
Watchung 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 ADU size of 25% of the aggregate habitable floor area of all buildings on the lot
Detached ADU Size Limits
- –Maximum size is 25% of the total habitable floor area of all buildings on the lot.
Max Units
- –1 accessory apartment per single-family lot
Parking
- –Off-street parking required for ADU occupants; no numeric minimum stated; RSIS governs residential parking minimums and supersedes local standards.
Rental Restrictions
- –First 10 years: rented only to low/moderate-income households at affordable rents with a deed restriction; after 10 years may convert to market-rate unless extended; written lease required and no additional fees beyond the approved rent (fees capped at 5% of monthly rent); Administrative Agent oversees rents, annual increases, and tenant selection.
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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ADU rules in other New Jersey municipalities
Rules change at the town line. Check the municipality your property is actually in.
Somerset County
Bedminster TownshipBernards TownshipBernardsville BoroughBound Brook BoroughBranchburg TownshipBridgewater TownshipFar Hills BoroughFranklin Township (Somerset)Green Brook TownshipHillsborough TownshipManville BoroughMontgomery TownshipNorth Plainfield BoroughPeapack And Gladstone BoroughRaritan Township (Somerset)Rocky Hill BoroughSomerville BoroughSouth Bound Brook BoroughWarren Township