ADU Rules in New Jersey (2026)
ADU rules in New Jersey — no statewide ADU law. Regulation is entirely local. Key provisions and city-specific frameworks for accessory dwelling units.
Law Name
Preempts Local Ordinances
No — local rules may be stricter
Has State Law
No — regulation is local
Statewide Preemption Status Unconfirmed
No statewide preemption statute was confirmed for this jurisdiction — regulation is local. Local governments retain full authority to set their own rules.
Local Control Framework
New Jersey does not have a comprehensive statewide ADU preemption law as of 2026 · Source
ADU regulation is left to local municipalities under the New Jersey Municipal Land Use Law (MLUL) · Source
Some NJ municipalities permit ADUs — provisions vary widely across the state's 564 municipalities · Source
New Jersey's Council on Affordable Housing (COAH) and Fair Share housing obligations have historically pushed municipalities to allow higher-density housing including some ADU provisions · Source
NJ has been considering ADU reform legislation but comprehensive statewide by-right mandate had not passed as of 2026 · Source
New Jersey State Planning Commission provides guidance on housing development including secondary dwellings · Source
Legislative History
2024 — Various NJ ADU Bills (proposed) · Source
New Jersey Legislature considered several bills to require municipalities to allow ADUs by right, but a comprehensive statewide ADU preemption law had not been enacted as of 2026. NJ's complex home-rule tradition and 564 municipalities create challenges for statewide preemption. · Source
Source: New Jersey Local Zoning Authority. Last verified April 5, 2026. View source