Edison, NJ Accessory Structures: ADU Rules (2026)

Unlike California, Oregon, Washington, or Arizona, New Jersey has not enacted a statewide ADU mandate that overrides municipal zoning - the state's affordable-housing framework runs through the Mount Laurel doctrine, the Fair Housing Act (N.J.S.A. 52:27D-301 et seq.), and individual settlement agreements, not a statewide by-right ADU statute. As a result, ADUs in Edison are governed entirely by the Township's own Chapter 37 (Zoning). Edison's land use ordinance is built around single-family detached, two-family, and multi-family use districts and does not include an 'accessory dwelling unit' as a permitted accessory use in any single-family residential zone (R-AA, R-A, R-BB, R-B, R-C). A homeowner who wants to add a second independent dwelling unit on a single-family lot must therefore apply to the Edison Zoning Board of Adjustment for a use variance under N.J.S.A. 40:55D-70(d) and must demonstrate both 'special reasons' for the variance and that the variance can be granted without substantial detriment to the public good or impairment of the zone plan. This is a high bar - use variances are reviewed at noticed public hearings with neighbor notification under N.J.S.A. 40:55D-12 - and approval is far from guaranteed. Some Edison properties may qualify for a two-family use as-of-right in the R-BB or R-B zones depending on lot size and frontage, which is a far simpler path than seeking an ADU variance. Homeowners should consult with the Township Planning and Zoning Division before filing.