1 county-level rule, plus city-specific rules for 4 cities in Essex County, New Jersey.
Verified from official government sources
Essex 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 belongs to each of Essex County's 22 municipalities. Several Essex municipalities — including Montclair (March 2023) and South Orange (2023) — have adopted formal ADU ordinances, while Newark's Title XLI (2023 zoning rewrite) allows for additional indoor dwelling units of 250+ sq ft.
4 cities in Essex County have their own accessory structures rules. Each link goes to that city's dedicated page with code citations.
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Essex County Ordinance Hub →