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Fair Lawn, Bergen County · New Jersey
Can you build an ADU in Fair Lawn, NJ?
An accessory dwelling unit (ADU), a granny flat, in-law suite, or backyard home, can add rental income or family space. Whether Fair Lawn 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.
Fair Lawn zoning & ADU rules
Max height (residential)
35 ft
Max stories
2.5
Min lot area
10,000 sf
We've mapped Fair Lawn'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: https://ecode360.com/10051870?view=browse §Sec. 125 Attachment…
Fair Lawn’s ADU rules, cited
- Fair Lawn does not currently permit ADUs by right, so a variance may be needed.
Sources: Fair Lawn Code Sections 125-17A, 125-18, 125-36 and Chapter 49 (ecode360 FA1754, read 2026-10-03); Fair Lawn Fourth Round Housing Element and Fair Share Plan (prepared 2026-03-27), page 41 and Appendix L (DRAFT Section 49-3, PDF pages 182 to 184).; Borough of Fair Lawn Code Chapter 125 (Land Development), all twelve articles searched 2026-10-03 on ecode360 (FA1754; new laws through Ord. 2812-2026 of 7-21-2026): Section 125-17A (R-1-1, R-1-2, R-1-3) permits '(1) One-family dwelling, only one such dwelling per lot and provided that there is no other principal use on this lot'; Section 125-36: 'In one- and two-family zones, except as may be allowed in planned developments, there shall be not more than one principal structure on each lot'; Section 125-18 allows two-family dwellings only in R-2. Chapter 49 (Affordable Housing, as amended by Ord. 2786-2026) defines 'accessory apartment' but Sections 49-3 to 49-10 are '(Reserved)'.
See exactly what your lot allowsAccessory dwelling units (ADUs) in Fair Lawn, New Jersey
New Jersey has no single statewide ADU law. Each of the state's 564 municipalities, Fair Lawn (Bergen County, NJ) included, sets its own zoning for accessory dwelling units (granny flats, in-law suites, backyard homes). Whether you can build one in Fair Lawn, how big, and how tall depends on the town's ordinance and your specific lot. We've mapped Fair Lawn's residential zoning: buildings are capped around 35 ft / 2.5 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 Fair Lawn lot
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ADU FAQ
Can I build an ADU in Fair Lawn, NJ?
Fair Lawn 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 Fair Lawn address to see for sure, free.
How much does an ADU cost in Fair Lawn?
A detached ADU in Fair Lawn typically runs $150,000 to $300,000+ all-in depending on size, site, and finishes. The build is financed and the rent helps carry the loan. You own the home.
Do I need to live on-site to build an ADU in Fair Lawn?
Some NJ towns require owner-occupancy; others (like Jersey City) don't. We check Fair Lawn's specific ordinance for you when you run your address.
See exactly what your Fair Lawn lot allows
Enter your address and we read Fair Lawn’s zoning against your parcel and tell you if an ADU fits, how big, and what it could earn. Free.
Check if your Fair Lawn lot qualifies, free