ADUs are allowed in Bethlehem TownshipTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Bethlehem Township, NJ
Is your property eligible for an ADU?
# of Properties
1,434
Owner-occupied
80%
Zoning districts
12
Avg Home Value
$563,311
Median Lot Size
1.94 acres
Avg Income
$147,450
Residential Types:
1,434 housing units
Condos
6%
Other
94%
Zoning Districts:
1,788 parcels · 12 districts
MR
64%(1,139)
R-1.5
22%(390)
AR
6%(110)
R-1
3%(50)
Other
6%(99)
ADU Rules
What can you build in Bethlehem Township, NJ?
Bethlehem 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
Detached ADU Size Limits
- –Maximum size of 750 sq ft for ECHO (elder cottage) detached units
Owner Occupancy
- –ECHO ADUs require owner occupancy; affordable units have no stated requirement.
Parking
- –3 off-street spaces per ADU; no max; applies to accessory apartments under Bethlehem's affordable housing program; plans must show required spaces; general off-street standards (§102-25) apply.
Rental Restrictions
- –ADUs must be deed-restricted and rented only to income-eligible households for 10 years, with a recorded restriction on further rental; occupants must use the unit as a principal residence (≥260 days/year) and a written lease is required for restricted rentals (short-term rentals barred); for program placements, lease before occupancy and marketing to income-eligible households; preexisting unauthorized ADUs may be legalized only if deed-restricted for occupancy by a qualified low-income household for 10 years.
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 TownshipBloomsbury BoroughCalifon BoroughClintonDelaware TownshipEast Amwell TownshipFlemington BoroughFranklin Township (Hunterdon)Frenchtown BoroughGlen Gardner BoroughHampton BoroughHigh Bridge BoroughHolland TownshipKingwood TownshipLambertvilleLebanon BoroughMilford BoroughReadington TownshipTewksbury TownshipUnion Township (Hunterdon)West Amwell Township