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Greenwich Warren, Warren County · New Jersey
Can you build an ADU in Greenwich Warren, NJ?
An accessory dwelling unit (ADU), a granny flat, in-law suite, or backyard home, can add rental income or family space. Whether Greenwich Warren 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.
Greenwich Warren zoning & ADU rules
Max height (residential)
35 ft
Max stories
2.5
Min lot area
217,800 sf
We've mapped Greenwich Warren'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: Schedules 10 and 11 · https://ecode360.com/FR1054 (via Composite Zoning 2024 (NJ), ArcGIS FeatureServer, accessed 2026-08-11)
How long a permit takes in Greenwich Warren
From 943 real Greenwich Warren permits in the New Jersey DCA record. The largest group, international residential code, takes a median of 95 days from filing to issue (n=822). 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 | 822 | 41d | 95d | 233d |
| Accessory buildings and miscellaneous structures | 95 | 58d | 180d | 354d |
| Mercantile buildings | 14 | 77d | 257d | 341d |
| Business Uses | 12 | 34d | 57d | 111d |
Accessory dwelling units (ADUs) in Greenwich Warren, New Jersey
New Jersey has no single statewide ADU law. Each of the state's 564 municipalities, Greenwich Warren (Warren County, NJ) included, sets its own zoning for accessory dwelling units (granny flats, in-law suites, backyard homes). Whether you can build one in Greenwich Warren, how big, and how tall depends on the town's ordinance and your specific lot. We've mapped Greenwich Warren's residential zoning: buildings are capped around 35 ft / 2.5 stories, with a minimum lot area near 217,800 sf. Your ADU follows the town's accessory-structure standards on top of that.
Backyard homes that could fit a Greenwich Warren lot
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ADU FAQ
Can I build an ADU in Greenwich Warren, NJ?
Greenwich Warren 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 Greenwich Warren address to see for sure, free.
How much does an ADU cost in Greenwich Warren?
A detached ADU in Greenwich Warren 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 Greenwich Warren 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 Greenwich Warren?
Some NJ towns require owner-occupancy; others (like Jersey City) don't. We check Greenwich Warren's specific ordinance for you when you run your address.
See exactly what your Greenwich Warren lot allows
Enter your address and we read Greenwich Warren’s zoning against your parcel and tell you if an ADU fits, how big, and what it could earn. Free.
Check if your Greenwich Warren lot qualifies, free