Accessory Structures in Plainfield, NJ (2026)
4 verified accessory structures rules for Plainfield, New Jersey, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
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.
Plainfield ADU (Accessory Dwelling Unit) Rules
Heavy RestrictionsShed Rules
Plainfield limits storage sheds to 150 sq ft and one story or 15 ft height (whichever is less). Sheds must be used exclusively by occupants for residential purposes. Max 3 accessory structures per lot. No box containers.
Plainfield Shed & Outbuilding Rules
Some RestrictionsGarage Conversions
Garage conversions in Plainfield require building permits per NJ UCC (N.J.A.C. 5:23) and zoning approval. Must maintain off-street parking requirements. Unpermitted construction subject to fines under NJ UCC.
Plainfield Garage Conversion Rules
Heavy RestrictionsCarport Rules
Plainfield's Land Use Ordinance (Ch. 17) does not single carports out by name; it regulates them through the general accessory-structure rule at Section 17:9-19. Accessory structures must sit on the same lot as the principal use, are not allowed in a front yard, and must be set back at least three feet from each side and rear property line. A development permit from Planning and Zoning is required before installation, and a Uniform Construction Code building permit is required for the framed roof structure under N.J.A.C. 5:23. No more than three accessory structures are allowed on a lot, and total accessory coverage is capped at 35% of the principal building's ground area.
Carport Rules in Plainfield
Some RestrictionsLooking for Union County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Plainfield city rules.
Accessory Structures in Union County →