ADU laws in New Jersey

In plain words

New Jersey does not have a statewide ADU law yet. An accessory dwelling unit (ADU) is a small second home on the same lot as a house. Think of a basement apartment, an in-law suite, or a backyard cottage. Right now each city and town decides through its zoning, the local rules about what you can build where. Some towns allow ADUs. South Orange, Princeton and Newark are examples. Many towns do not allow them at all. Towns that allow ADUs often add conditions. Common ones are that the owner must live on the property and that the unit cannot be a short-term rental. If your town bans ADUs, you would need a variance. A variance is special permission from the zoning board to break a rule, and it requires a public hearing. That could change. A bill called S1786 passed a Senate committee on June 1, 2026 and now sits in the Senate budget committee. If it becomes law, most towns would have to allow ADUs. Staff would approve them without a hearing within 60 days. Towns could not demand extra parking, and new ADUs could not be rented for less than 30 days. A similar bill died in the last session, so nothing is certain. A separate 2026 law gives towns that allow ADUs an edge for some state grants, but it does not force any town to allow them. Until a law passes, your town's rules control. You may be able to build one if your local rules and your property allow it.

The rules at a glance

What to do next

1. Look up your town's zoning ordinance (many are posted on eCode360 or the town website) or call the zoning officer and ask whether accessory dwelling units or accessory apartments are allowed in your zone.
2. If they are allowed, write down the owner-occupancy, size, setback, parking and minimum rental term rules before you design anything.
3. If they are not allowed, ask the zoning officer what a variance application to the zoning board would involve, including notice costs and hearing dates.
4. Check HOA or condo documents, which can add their own limits.
5. Ask whether your town runs an ADU or accessory apartment assistance program (Newark started one in 2026) or takes part in the state's NJHOMES Launchpad program.
6. Follow S1786 on the New Jersey Legislature website; if it becomes law, most towns would have 90 days to adopt matching rules.

Grants, loans and tax breaks

• New Jersey Affordable Housing Trust Fund (ADU use): State law lists creating ADUs that will be lived in by low- and moderate-income households as one allowed use of this fund in designated neighborhoods. The statute does not set up a direct homeowner application, so ask your town or the Department of Community Affairs whether ADU money is available locally. Program page
• NJHOMES Launchpad (Department of Community Affairs): A competitive program for towns, not homeowners. Selected towns get $100,000 over two years for a housing staff lead and access to a $10 million predevelopment fund for projects with nonprofit developers. The first round set aside at least 20% of funding for towns that want to use ADUs to meet affordable housing goals. Ten towns, including Montclair and Evesham, were picked in August 2025. Ask your town whether it is taking part. Program page

What your town still decides

Under New Jersey's Municipal Land Use Law, each municipality's zoning ordinance decides whether ADUs are allowed, where, and under what conditions. There is no state rule forcing towns to allow them, so the answer differs from one town to the next; New Jersey Future, a planning nonprofit, says building an ADU is illegal in most of the state's 564 municipalities. Towns that allow them often add conditions such as an owner living on site and minimum rental terms. ADUs also connect to New Jersey's Mount Laurel affordable housing system: the 2024 Fair Housing Act rewrite added a statewide ADU definition, and the main pending bill (S1786) would update that definition. Since August 2026, P.L.2026, c.78 also gives towns that loosen housing rules, for example by allowing an ADU next to a single-family home, an edge in some competitive state grants once it takes effect in 2027, but it forces nothing. If a town bans ADUs, a homeowner's only route is usually a variance (permission to break a zoning rule) from the local zoning board, which requires a public hearing.

Examples of local rules

• South Orange (Essex County): Ordinance 2022-34, adopted in 2023, allows an ADU on a lot with a one- or two-family home when the owner lives on the property. The ADU can be part of the main house or an accessory building, must be smaller and lower than the main building, and cannot be rented for stays shorter than 90 days. Source
• Newark: Newark's zoning ordinance already regulates ADUs. On July 15, 2026 the Municipal Council adopted Ordinance 26-0907, creating an ADU Financial Assistance Program paid for with a federal HUD PRO Housing grant. It can offer grants or forgivable loans for building, converting or fixing ADUs, and city housing staff set income, owner-occupancy and affordability rules for applicants. Source
• Princeton: According to New Jersey Future, Princeton has allowed ADUs since 2020 and 38 had been built by May 2025. The same source lists Maplewood (2020) and Montclair among other towns with ADU rules. Confirm current details with each town. Source

What we’re still confirming

• S1786, the main statewide ADU bill, would make ADUs a permitted use in many towns, but it hasn't moved since June 1, 2026.
• A proposed $10 million state ADU loan pilot doesn't appear to have launched; ask about the ADU set-aside in the state's NJHOMES Launchpad program instead.

Laws, bills and citations

This is general information, not legal advice. Your town, village, city or county decides what can be built on your property. If something here looks out of date, email the team.