Edison, NJ Accessory Structures: Garage Conversions (2026)

A garage conversion in Edison involves two distinct regulatory questions. First, whether the converted space remains an integrated extension of the principal dwelling (additional bedroom, family room, home office) or becomes an independent dwelling unit with its own kitchen, full bathroom, and separate entrance. An integrated conversion is a use that is generally permitted by right in residential zones and requires (a) a Chapter 37 zoning permit confirming compliance with bulk and parking standards, and (b) the standard NJ UCC subcode permits - building, electrical, plumbing, and (where the wall is modified) fire-protection - under N.J.A.C. 5:23. Converting to an independent dwelling unit is treated as an ADU and, because Edison's Chapter 37 does not list ADUs as a permitted accessory use, requires a use variance from the Zoning Board of Adjustment under N.J.S.A. 40:55D-70(d) - the same high-bar approval process discussed in the adu-rules entry. Second, parking: Edison's Chapter 37 requires a minimum number of off-street parking spaces per dwelling unit (typically 2 per single-family home). If the garage being converted was counted toward those minimums, the conversion may require replacement parking on the lot - the Zoning Officer will require a parking calculation as part of the application. Where the garage abuts a side lot line, the Construction Code Official will also require the converted exterior wall to meet UCC fire-resistance ratings for the existing setback. Gas piping for any new appliances must be installed by a NJ Master Plumber under N.J.S.A. 45:14C, and electrical work must be performed by a NJ-licensed electrical contractor.