ADU rules in Plainfield, NJ — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Plainfield does not permit accessory dwelling units by right. New Jersey has no statewide ADU mandate. Additional dwelling units require zoning board approval. Max 3 accessory structures per lot.
New Jersey does not have a statewide law requiring municipalities to allow ADUs. Whether Plainfield 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.
Plainfield, NJ
Plainfield's animal ordinance (Ch. 5) prohibits permitting any dog or animal to annoy or injure any person or animal, or to run at large. Dogs must be on a l...
Plainfield, NJ
Plainfield prohibits construction noise on Sundays entirely and weekdays between 6:00 p.m. and 7:00 a.m. within 1,000 feet of any dwelling or business. Emerg...
Plainfield, NJ
Plainfield's noise ordinance (Ch. 5, Offenses Against Public Peace and Order) prohibits unreasonable noise that disturbs the peace. NJDEP statewide limits of...
Plainfield, NJ
Plainfield's zoning code (Ch. 17) regulates vehicle storage in residential zones. Off-street parking lots may not be used as thoroughfares. Contact the Zonin...
Plainfield, NJ
Plainfield requires zoning permits for driveways under Ch. 17. Impervious coverage subject to stormwater management requirements. Stormwater shall not be dis...
Plainfield, NJ
Plainfield regulates parking under Ch. 7 (Vehicles and Traffic). City-owned downtown lots prohibit parking 2:00 a.m.–6:00 a.m. Street parking subject to post...
Side-by-side rule comparisons with other cities in Union County.
See how other cities in Union County handle adu rules.
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