ADUs are allowed in Union Township (Hunterdon)Types:Internal
Types:Internal
Accessory Dwelling Unit (ADU) Rules for Union Township (Hunterdon), NJ
Is your property eligible for an ADU?
# of Properties
1,852
Owner-occupied
75%
Zoning districts
19
Avg Home Value
$598,687
Median Lot Size
1.51 acres
Avg Income
$147,417
Residential Types:
1,852 housing units
Condos
2%
Other
98%
Zoning Districts:
2,152 parcels · 19 districts
CR
25%(545)
RM
24%(519)
AP-2
17%(373)
CM
12%(265)
Other
21%(450)
ADU Rules
What can you build in Union Township (Hunterdon), NJ?
Union Township (Hunterdon), NJ follows state and local rules for Accessory Dwelling Units. Here is a concise overview of the local rules.
Eligibility
- –Internal / Attached ADU: Conditional Use Permit
- –Detached ADU: Not permitted
Interior / Attached ADU Size Limits
- –Maximum size of 1,200 sq ft
- –Maximum size of one-third of the principal dwelling’s floor area (using gross floor area as a proxy for net floor area)
Max Units
- –1 ADU per lot for single-family detached in RA/RB zones.
- –0 ADU per lot for two-family homes, townhomes, and for detached/garage/basement ADU types.
Owner Occupancy
- –ADU must be located in an owner-occupied dwelling
Parking
- –No ADU-specific parking; RSIS governs residential parking; 1 space in an enclosed garage for 1–2 family dwellings; applicability to ADUs not stated.
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.
Check my propertyHow can we help you?
Get matched with trusted local builders
Understand what's allowed on your property
Learn the key rules and size limits for ADUs
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.
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 TownshipWest Amwell Township