10/15/2026
Short answer: yes. Every time. New Jersey's Uniform Construction Code requires a construction permit for new construction and for work on existing buildings, and enlarging a house is squarely on that list.
A family room off the back, a second story, a bigger kitchen pushed out into the yard. All of it needs a permit before anybody digs.
People really want to know the rest. Who applies? What has to happen first? How long does the town get, and what are all those inspections about? This post covers it step by step, the way it usually plays out here in Ocean and Monmouth County.
Do you need a permit for a home addition in New Jersey? Zoning, flood zones, plan review time, required inspections and the Certificate of Occupancy