Short answer
Usually. New Jersey requires a construction permit to build, renovate or alter a structure (N.J.A.C. 5:23-2.14) unless the work is ordinary maintenance. Painting, flooring, trim, cabinets and swapping a fixture without changing the piping need no permit (N.J.A.C. 5:23-2.7). Moving plumbing, adding wiring or cutting a bearing wall does.
Work that needs no permit
The Uniform Construction Code lists work that counts as ordinary maintenance: no permit, no inspection and no notice to the town (N.J.A.C. 5:23-2.7). The list is not all-inclusive. In a one- or two-family home it includes:
- Interior and exterior painting, and wallpaper
- New drywall or plaster over less than 25 percent of the wall area (paneling is not included)
- Replacing flooring with a new material
- Installing or replacing cabinets, built-ins and bathroom accessories
- Trim, moldings and decoration
- Replacing a window or door in the same opening without changing its size or framing
- Replacing faucets, shower valves and traps, and replacing a fixture with a similar one without changing the piping
- Replacing a switch, receptacle or light fixture with a similar one, and replacing a dishwasher
- Repairing or replacing roof covering or siding on a detached one- or two-family house (polypropylene siding excepted)
Work that does need a permit
The same section says ordinary maintenance never includes:
- Cutting away any part of a load-bearing wall, or removing or cutting a structural beam or support
- Removing or changing a required way out of the house, such as an egress window
- Any work affecting structural or fire safety
- Adding, altering, replacing or relocating water supply, drain, waste, vent, gas or similar piping
- Electrical wiring (other than low-voltage communications wiring)
- Mechanical work affecting health or safety, and any lead abatement work
What that means for common projects
- Kitchen: new cabinets, counters and flooring alone are ordinary maintenance. Moving the sink, running a gas line or adding circuits needs a permit.
- Bathroom: swapping a vanity or toilet in place is ordinary maintenance. A tub-to-shower conversion that moves the drain needs one.
- Basement: framing new rooms, wiring and plumbing all need permits, and a bedroom has code requirements of its own. See what a basement bedroom needs.
- Addition: always needs a permit, and often zoning approval first. See home addition permits.
Who handles the permit
A contractor may not start work until every required permit has been issued, and where inspections are required, it must give you copies of the inspection certificates before final payment is due (N.J.A.C. 13:45A-16.2). For borderline work, your town's construction official makes the call.
Sources
- New Jersey Uniform Construction Code, N.J.A.C. 5:23-2.14, Construction permits: when required. Checked September 2026.
- New Jersey Uniform Construction Code, N.J.A.C. 5:23-2.7, Ordinary maintenance (work that needs no permit). Checked September 2026.
- New Jersey Division of Consumer Affairs, N.J.A.C. 13:45A-16.2, Home Improvement Practices (contract terms, permits, warranties). Checked September 2026.