ADUs are allowed in Old Tappan BoroughTypes:Internal
Types:Internal
Accessory Dwelling Unit (ADU) Rules for Old Tappan Borough, NJ
Is your property eligible for an ADU?
# of Properties
126
Owner-occupied
26%
Zoning districts
24
Avg Home Value
$1,142,056
Median Lot Size
0.47 acres
Avg Income
$208,719
Residential Types:
126 housing units
Single Family
28%
Apts (4+ units)
37%
Condos
36%
Zoning Districts:
2,362 parcels · 24 districts
RA-25
24%(572)
RA-40
18%(429)
PRD
18%(420)
RA-15
11%(264)
Other
29%(677)
ADU Rules
What can you build in Old Tappan Borough, NJ?
Old Tappan Borough, 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 25% of the dwelling’s total floor area (excluding cellar and garage areas)
Max Units
- –Single-family (detached): 1 attached/internal ADU per lot
- –Detached ADU: 0
Owner Occupancy
- –Owner must reside on-site in either the ADU or main dwelling.
Parking
- –1 additional off-street space per ADU (in addition to the 2 spaces for the primary dwelling); on the same lot; must comply with § 255-48; no waivers or transit-related reductions stated.
Rental Restrictions
- –Internal/attached ADU: after title transfer, lease may continue but not beyond 1 year from recordation unless a new CO is issued; after death or permanent vacation of the senior occupant, lease may continue only during a grace period up to 1 year from the event (longer of 180 days or remaining term).
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.
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