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Kenilworth, Union County · New Jersey
Can you build an ADU in Kenilworth, NJ?
An accessory dwelling unit (ADU), a granny flat, in-law suite, or backyard home, can add rental income or family space. Whether Kenilworth 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.
Kenilworth zoning & ADU rules
Max height (residential)
35 ft
Max stories
2.5
Min lot area
5,000 sf
We've mapped Kenilworth'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: municipal zoning ordinance
Kenilworth’s ADU rules, cited
- Kenilworth does not currently permit ADUs by right, so a variance may be needed.
Sources: Borough of Kenilworth Code Chapter 120 (Land Use), Part 3 (Zoning), Article 23 (Zone District Regulations) Sections 120-23.1 (R-6), 120-23.2 (R-5), 120-23.3 (R-5A), and Article 24 Section 120-24.1. Read 2026-10-03 from the Zoneomics mirror of Articles 23 and 24 (zoneomics.com/code/kenilworth-NJ/chapter_4 and chapter_5) and search-index snippets of ecode360.com/31837267 (ecode360 returns 403 to a direct fetch); Ordinance No. 2026-07 read from the Borough's March 17, 2026 court filing. Says: the single-family zones permit single-family residential uses in detached single-family structures, with 'senior suites' as an accessory use; R-5A alone adds two-family residential uses; no accessory apartment or ADU use is listed. Ordinance 2026-07 adds an 'accessory apartments' definition in the affordable housing article only.
See exactly what your lot allowsAccessory dwelling units (ADUs) in Kenilworth, New Jersey
New Jersey has no single statewide ADU law. Each of the state's 564 municipalities, Kenilworth (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 Kenilworth, how big, and how tall depends on the town's ordinance and your specific lot. We've mapped Kenilworth's residential zoning: buildings are capped around 35 ft / 2.5 stories, with a minimum lot area near 5,000 sf. Your ADU follows the town's accessory-structure standards on top of that.
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ADU FAQ
Can I build an ADU in Kenilworth, NJ?
Kenilworth 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 Kenilworth address to see for sure, free.
How much does an ADU cost in Kenilworth?
A detached ADU in Kenilworth 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 Kenilworth?
Some NJ towns require owner-occupancy; others (like Jersey City) don't. We check Kenilworth's specific ordinance for you when you run your address.
See exactly what your Kenilworth lot allows
Enter your address and we read Kenilworth’s zoning against your parcel and tell you if an ADU fits, how big, and what it could earn. Free.
Check if your Kenilworth lot qualifies, free