ADU rules in Vernon, NJ — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
New Jersey has NO statewide mandate requiring municipalities to permit accessory dwelling units (ADUs). Senate Bill S2347 (2024-2025 session) — which would have authorized ADUs by right on single-family lots — died in committee and was reintroduced as S1786 in January 2026, pending in the Senate Community and Urban Affairs Committee. Until a statewide bill is enacted, zoning authority over ADUs rests with each of New Jersey's 564 municipalities under the Municipal Land Use Law (N.J.S.A. 40:55D et seq.).
Under New Jersey's Municipal Land Use Law (N.J.S.A. 40:55D-1 et seq.), zoning power is delegated to each of the 564 municipalities — counties have no zoning role except for review of subdivisions affecting county roads or drainage. As of May 2026, New Jersey is one of the few coastal-Northeast states WITHOUT a statewide ADU preemption like California (Gov. Code §65852.2), Vermont (24 V.S.A. §4412(1)(E)), or Massachusetts (M.G.L. Ch. 40A §3A). The legislative history: Senate Bill S2347 was introduced January 29, 2024 by Senator Troy Singleton (D-Burlington) to authorize ADUs as of right in single-family and two-family zones, limit parking requirements to one space (waived near transit), and impose a 60-day ministerial review window. S2347 did not advance past committee in the 2024-2025 session and expired. Senator Singleton reintroduced substantially similar provisions as S1786 in the 2026-2027 session (introduced January 13, 2026), which is pending in the Senate Community and Urban Affairs Committee. The New Jersey League of Municipalities has formally opposed statewide ADU preemption. Several New Jersey municipalities have voluntarily adopted ADU-friendly ordinances — including Jersey City (Land Development Ordinance §345-41 allows detached ADUs), Montclair (March 2023, 300-800 sq ft with owner-occupancy and recorded deed notice), and South Orange Village (2023). Newark's Title XLI (adopted November 2023) treats any indoor space of 250+ sq ft with separate access as an additional dwelling unit. Most other New Jersey municipalities either prohibit or significantly restrict ADUs through their underlying zoning. Construction permits are issued by each municipality's Construction Official under the New Jersey Uniform Construction Code (N.J.A.C. 5:23).
Unpermitted ADUs are violations of both the local zoning ordinance and the New Jersey Uniform Construction Code (N.J.A.C. 5:23), enforced by the municipal Zoning Officer and Construction Official with stop-work orders, summonses under N.J.S.A. 40:49-5 (fines up to $2,000 per violation plus up to 90 days imprisonment), and required after-the-fact permits or restoration. The State of New Jersey does not directly enforce local ADU rules — enforcement is entirely municipal.
See how Vernon's adu rules rules stack up against other locations.
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