New Jersey Uniform Construction Code Governs Garage Conversions

Under NJSA 52:27D-119 et seq. and N.J.A.C. 5:23, any change of use from a garage (Use Group U) to habitable living space (Use Group R) is a regulated activity requiring construction permits, plan review, and inspections. The UCC preempts local construction codes and applies uniformly across all 564 municipalities. Conversions must meet egress, ceiling height, insulation, smoke alarm, and energy code requirements. Local zoning approval for the change of use is also required separately.

Performing a garage conversion without UCC permits can result in stop-work orders and penalties up to $2,000 per violation under N.J.A.C. 5:23-2.31, plus mandatory restoration or retroactive compliance.