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An accessory dwelling unit (ADU), a granny flat, in-law suite, or backyard home, can add rental income or family space. Whether Union Twp 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.
We have not sourced Union Twp's zoning ordinance or its ADU rules yet, so we cannot say what Union Twp permits on your lot. That is our gap, not Union Twp's. Run your address to see what we hold for it today.
Sources: Township of Union Code Chapter 170 (Land Development Ordinance) Section 170-1617 (Accessory Dwelling Units (ADUs)), in Article 16 (Conditional Uses). Read 2026-10-03 from the full text of the Zoning Code Update adopted December 17, 2024 (Colliers Engineering, published by General Code at ecode360.com/UN1023/laws/LF2282934.pdf, text extracted from the PDF), corroborated by search-index snippets of ecode360.com/40913681. Says: ADUs are a conditional use in the RA and RB zones on lots of at least 5,000 sq ft, only accessory to a single-family detached home, one per lot, inside an owner-occupied dwelling, not in basements, garages or accessory structures, no more than one-third of the building's net floor area up to 1,200 sq ft, at least one off-street space, registration under Chapter 419.
New Jersey has no single statewide ADU law. Each of the state's 564 municipalities, Union Twp (NJ) included, sets its own zoning for accessory dwelling units (granny flats, in-law suites, backyard homes). Whether you can build one in Union Twp, how big, and how tall depends on the town's ordinance and your specific lot. We have not sourced Union Twp's zoning ordinance yet, so we cannot tell you what Union Twp permits on your lot. That is a gap in our record, not a finding about Union Twp. What we can do today is measure the lot itself: its dimensions, what already sits on it, and its flood exposure.
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Explore all modelsUnion Twp 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 Twp's ordinance yet, so we cannot confirm what it permits. Run your Union Twp address and we will show you what we do hold for that lot, and say plainly what we do not.
A detached ADU in Union Twp 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.
Some NJ towns require owner-occupancy; others (like Jersey City) don't. We check Union Twp's specific ordinance for you when you run your address.
In Union Twp, an ADU can be up to 1,200 sq ft, or 33.33% of the main house, subject to your lot's size, coverage, and setbacks. (Source: Township of Union Code Chapter 170 (Land Development Ordinance) Section 170-1617 (Accessory Dwelling Units (ADUs)), in Article 16 (Conditional Uses). Read 2026-10-03 from the full text of the Zoning Code Update adopted December 17, 2024 (Colliers Engineering, published by General Code at ecode360.com/UN1023/laws/LF2282934.pdf, text extracted from the PDF), corroborated by search-index snippets of ecode360.com/40913681. Says: ADUs are a conditional use in the RA and RB zones on lots of at least 5,000 sq ft, only accessory to a single-family detached home, one per lot, inside an owner-occupied dwelling, not in basements, garages or accessory structures, no more than one-third of the building's net floor area up to 1,200 sq ft, at least one off-street space, registration under Chapter 419..) Run your Union Twp address to see the exact size your lot allows, free.
Enter your address and we read Union Twp’s zoning against your parcel and tell you if an ADU fits, how big, and what it could earn. Free.
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