ADU rules in Union County, NJ — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
New Jersey has no statewide ADU mandate. ADU permission depends on local zoning per NJ MLUL. Most Union County municipalities do not permit ADUs by right. Zoning board variance required in most communities.
New Jersey does not have a statewide law requiring municipalities to allow ADUs. Whether Union County permits accessory dwelling units depends on the local zoning ordinance per the NJ Municipal Land Use Law (N.J.S.A. 40:55D-1 et seq.). NJ has considered ADU legislation but has not enacted it as of 2025. Some municipalities allow ADUs by conditional use or variance. NJ’s smaller lot sizes and density create additional challenges for ADU development. Where allowed, typical conditions include owner-occupancy, size limits, and dedicated parking.
Unpermitted ADU: code enforcement. Zoning violation: $100 to $2,000/day. May require removal of unpermitted unit.
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See how Union County's adu rules rules stack up against other locations.
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