Jersey City, NJ Accessory Structures: ADU Rules (2026)

Jersey City's Land Development Ordinance (codified as Chapter 345 of the Code of Ordinances) governs ADUs through §345-41 (Accessory Uses) under amendments adopted in 2022-2023. Key rules: ADUs must be detached from the principal structure; there is no fixed square-footage cap (size is governed by lot coverage, setbacks, and bulk standards of the underlying zone); garage-to-ADU conversions are specifically allowed in the R-1 zone with conditional use approval from the Planning Board under §345-41 G.1; conditional use criteria address building separation, parking, scale, and neighborhood compatibility. The Division of Zoning enforces and interprets the LDO, and the Division of Construction Code Enforcement issues UCC permits. ADUs in Jersey City must comply with the New Jersey Uniform Construction Code (N.J.A.C. 5:23) for habitable space (minimum 7-foot ceiling height, egress, light/ventilation, smoke and CO alarms, energy code). Jersey City does not have a state ADU mandate behind it — Senate Bill S2347 (2024-2025) died, and the carryover S1786 (2026-2027) was introduced 1/13/2026 and remains pending in the Senate Community and Urban Affairs Committee. Properties in redevelopment plan areas may have different standards governed by the redevelopment plan rather than the underlying LDO zone.