ADUs are allowed in West Amwell TownshipTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for West Amwell Township, NJ
Is your property eligible for an ADU?
# of Properties
1,121
Owner-occupied
67%
Zoning districts
14
Avg Home Value
$478,957
Median Lot Size
1.39 acres
Avg Income
$144,136
Residential Types:
1,121 housing units
Condos
7%
Other
92%
Zoning Districts:
1,527 parcels · 14 districts
RR-6
24%(370)
SRPD
23%(357)
RR-5
21%(323)
R1-A
7%(105)
Other
24%(372)
ADU Rules
What can you build in West Amwell Township, NJ?
West Amwell Township, 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 size of 1,200 sq ft of gross floor area (excluding garage space) for an internal or attached accessory apartment
Max Units
- –1 per property (general ADU)
- –1 per lot (accessory apartment on single-family lots)
- –1 per lot (ECHO unit)
Owner Occupancy
- –Owner must reside on-site in principal dwelling or ADU
Parking
- –1 space per bedroom (min); max 2 additional spaces beyond existing on-site parking; exceptions: spaces must be in side/rear yard for the ADU and cannot reduce principal dwelling parking below 2; new paved/gravel parking areas must be set back 5 ft from side/rear property lines; 5+ vehicle parking areas must be set back 20 ft.
Rental Restrictions
- –Affordability-based ADUs must be rented to income-eligible households under deed restriction (control period ≥10 years; two units for 30 years) with rent caps; written leases required; rent increases limited to once per year; no extra fees; maximum rent notices posted and leases submitted to the admin agent.
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.
Hunterdon County
Alexandria TownshipBethlehem TownshipBloomsbury BoroughCalifon BoroughClintonDelaware TownshipEast Amwell TownshipFlemington BoroughFranklin Township (Hunterdon)Frenchtown BoroughGlen Gardner BoroughHampton BoroughHigh Bridge BoroughHolland TownshipKingwood TownshipLambertvilleLebanon BoroughMilford BoroughReadington TownshipTewksbury TownshipUnion Township (Hunterdon)