1 county-level rule, plus city-specific rules for 3 cities in Middlesex County, New Jersey.
Verified from official government sources
Middlesex County does not regulate accessory dwelling units (ADUs) at the county level — under New Jersey's Municipal Land Use Law (N.J.S.A. 40:55D-1 et seq.), zoning authority rests with each of Middlesex County's 25 municipalities including Edison, Woodbridge, New Brunswick, Perth Amboy, Old Bridge, Piscataway, and East Brunswick. New Jersey has no statewide ADU mandate; S2347 (2024-2025) died and S1786 (2026-2027) is pending in committee.
3 cities in Middlesex County have their own accessory structures rules. Each link goes to that city's dedicated page with code citations.
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Middlesex County Ordinance Hub →