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Berkeley Heights, UNION County · New Jersey
Can you build an ADU in Berkeley Heights, NJ?
An accessory dwelling unit (ADU), a granny flat, in-law suite, or backyard home, can add rental income or family space. Whether Berkeley Heights allows one, and how big, comes down to the town’s zoning and your specific lot. Here’s what we know, and how to check yours.
Berkeley Heights zoning & ADU rules
Max height (residential)
27 ft
Max stories
2
Min lot area
10,000 sf
We've mapped Berkeley Heights's residential zoning. An ADU on your lot follows the town's accessory-structure standards: check your specific address for the exact size, height, and setback it allows.
Source: TABLE 1 [B. - Schedule of General Regulations.]
How long a permit takes in Berkeley Heights
From 3,305 real Berkeley Heights permits in the New Jersey DCA record. The largest group, international residential code, takes a median of 74 days from filing to issue (n=2,751). This is elapsed time, not review hours: it includes the waiting and the corrections.
| Project type | Permits | Fastest 25% | Median | Slowest 25% |
|---|---|---|---|---|
| International Residential Code | 2,751 | 28d | 74d | 245d |
| Business Uses | 276 | 29d | 105d | 213d |
| Multiple family dwellings, dormitories, etc. | 115 | 248d | 464d | 628d |
| Accessory buildings and miscellaneous structures | 96 | 33d | 95d | 246d |
| One and two family units, 5 lodgers or less each | 17 | 9d | 55d |
Accessory dwelling units (ADUs) in Berkeley Heights, New Jersey
New Jersey has no single statewide ADU law. Each of the state's 564 municipalities, Berkeley Heights (UNION County, NJ) included, sets its own zoning for accessory dwelling units (granny flats, in-law suites, backyard homes). Whether you can build one in Berkeley Heights, how big, and how tall depends on the town's ordinance and your specific lot. We've mapped Berkeley Heights's residential zoning: buildings are capped around 27 ft / 2 stories, with a minimum lot area near 10,000 sf. Your ADU follows the town's accessory-structure standards on top of that.
Backyard homes that could fit a Berkeley Heights lot
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ADU FAQ
Can I build an ADU in Berkeley Heights, NJ?
Berkeley Heights sets its own ADU rules, and we've mapped its residential zoning. Whether your specific lot qualifies, and how big an ADU it allows, comes down to your parcel's size, setbacks, and the accessory-structure standards. Check your Berkeley Heights address to see for sure, free.
How much does an ADU cost in Berkeley Heights?
A detached ADU in Berkeley Heights typically runs $150,000 to $300,000+ all-in depending on size, site, and finishes. Because the build is financed, you can add rental income to your Berkeley Heights property without paying the build cost up front, and the rent helps carry the loan.
Do I need to live on-site to build an ADU in Berkeley Heights?
Some NJ towns require owner-occupancy; others (like Jersey City) don't. We check Berkeley Heights's specific ordinance for you when you run your address.
See exactly what your Berkeley Heights lot allows
Enter your address and we read Berkeley Heights’s zoning against your parcel and tell you if an ADU fits, how big, and what it could earn. Free.
Check if your Berkeley Heights lot qualifies, free