Union City, Hudson County · New Jersey

Can you build an ADU in Union City, NJ?

An accessory dwelling unit (ADU), a granny flat, in-law suite, or backyard home, can add rental income or family space. Whether Union City 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.

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Union City zoning & ADU rules

We have not sourced Union City's zoning ordinance or its ADU rules yet, so we cannot say what Union City permits on your lot. That is our gap, not Union City's. Run your address to see what we hold for it today.

Union City’s ADU rules, cited

Union City does not currently permit ADUs by right, so a variance may be needed.

Sources: City of Union City Code Chapter 223 (Land Development), Section 223-8G(1) (Accessory structures and uses, general requirements), Section 223-8E(2) (Principal buildings), Section 223-40 (Permitted uses) and Section 223-42A (R Residential District). Read 2026-10-03 from the City's own PDF of Chapter 223 as adopted (effective November 4, 2019; ucnj.com), corroborated by ecode360 search-index snippets of Article II. Section 223-8G(1)(h): 'No accessory building shall be used for human habitation.' Section 223-8E(2) bars a second building for dwelling use on a lot already used for dwelling purposes, and Section 223-40 makes the zoning article permissive (a use not listed is not permitted). The R District lists no accessory apartment or accessory dwelling unit.

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Accessory dwelling units (ADUs) in Union City, New Jersey

New Jersey has no single statewide ADU law. Each of the state's 564 municipalities, Union City (Hudson County, NJ) included, sets its own zoning for accessory dwelling units (granny flats, in-law suites, backyard homes). Whether you can build one in Union City, how big, and how tall depends on the town's ordinance and your specific lot. We have not sourced Union City's zoning ordinance yet, so we cannot tell you what Union City permits on your lot. That is a gap in our record, not a finding about Union City. What we can do today is measure the lot itself: its dimensions, what already sits on it, and its flood exposure.

Backyard homes that could fit a Union City lot

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ADU FAQ

Can I build an ADU in Union City, NJ?

Union City sets its own ADU rules under New Jersey's home-rule system. Many NJ towns allow ADUs by right in residential zones; some require a variance. We have not sourced Union City's ordinance yet, so we cannot confirm what it permits. Run your Union City address and we will show you what we do hold for that lot, and say plainly what we do not.

How much does an ADU cost in Union City?

A detached ADU in Union City 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 Union City?

Some NJ towns require owner-occupancy; others (like Jersey City) don't. We check Union City's specific ordinance for you when you run your address.

See exactly what your Union City lot allows

Enter your address and we read Union City’s zoning against your parcel and tell you if an ADU fits, how big, and what it could earn. Free.