Moving in North Jersey costs a fortune before you buy a single thing — commissions, transfer fees, a new mortgage rate. Call (201) 676-3099 or book a free estimate.
Moving in North Jersey costs a fortune before you buy a single thing — commissions, transfer fees, a new mortgage rate. So people add on instead. A real addition in New Jersey in 2026 runs from about $45,000 for a small bump-out to $450,000+ for a full second story. Here's the breakdown by type, what's inside the number, and the seven things that push it.
2026 New Jersey price brackets
Per square foot, a finished addition in North Jersey lands around $300–$500. Bathrooms and kitchens push toward the top of that; a plain bedroom sits near the bottom. Small additions cost more per foot, not less, because the expensive parts — the foundation, the roof tie-in, the permits, the crane — don't shrink with the room.
| Addition type | Typical size | Typical fixed-price range |
|---|---|---|
| Bump-out (kitchen, bath or dining extension) | 40–100 sq ft | $45K – $90K |
| Single-room ground-floor addition (family room, bedroom, office) | 200–400 sq ft | $90K – $180K |
| Primary suite addition (bedroom, full bath, walk-in closet) | 350–600 sq ft | $150K – $300K |
| Two-story addition (rooms up and down) | 400–800 sq ft | $220K – $400K+ |
| Full second story over a ranch or cape | 800–1,500 sq ft | $300K – $450K+ |
| Attic or garage conversion (no new foundation) | 300–600 sq ft | $60K – $150K |
Where the money goes
- Design and engineering: architect drawings, structural calculations, a survey and zoning review. Usually 5–10% of the job.
- Excavation and foundation: footings, walls or slab, waterproofing, backfill.
- Framing, roof and the tie-in to the existing house — the part that decides whether it looks like an addition or like it was always there.
- Windows, doors, siding and roofing matched to the old house.
- Plumbing, heating and cooling: extending what you have or adding a system for the new space. Our plumbing and heating trades are on staff, so this is priced in the quote, not subbed out later.
- Electrical, sometimes including a panel upgrade if the old one is full.
- Insulation, drywall, flooring, trim, doors, paint.
- Bathroom or kitchen finishes if the addition has one.
- Permits, inspections, site protection and cleanup.
The 7 things that move the price
Wet rooms roughly double the per-foot cost of that part of the addition. The upside: because our plumbers and heating crew are our own people, those lines land in the fixed price from day one — not as a sub's ransom note halfway through.
A full basement under the addition costs the most and gives you the most. A crawlspace sits in the middle. A slab or piers is the cheapest — fine for a sunroom, not what you want under a primary suite.
A second story saves the yard, but the existing house has to carry it. An engineer checks the foundation and framing first, and you may need to live somewhere else for a stretch while the roof is off.
Tying a new roof into the old one, matching the siding, the brick, the window style — that's the difference between "addition" and "always been there." Cheap additions look like additions.
Sometimes your furnace and AC can stretch to cover the new space. Often a ductless mini-split for the addition is cleaner and cheaper than tearing up the house to run ducts. We price both.
Setbacks, lot coverage and height rules decide what you're allowed to build. A variance adds months, not just money. We check the zoning before you fall in love with a drawing.
A slope, ledge rock, a big tree, an old septic tank, a lot the crane can't reach — each one is a line item. You want to see it before you sign, not after the excavator finds it.
Is an addition cheaper than moving?
Run the numbers on selling: moving costs 8–10% of your home's price in fees alone. Commission, transfer taxes, attorney, movers — and then a new mortgage at today's rate instead of the one you locked years ago. On a typical North Jersey house that's tens of thousands of dollars before you gain a single square foot.
An addition puts that money into your walls instead. You keep the block, the school, the neighbors and the rate. Bigger house, same address.
How the timeline runs
- Design, engineering and permits: 2–4 months. This is where most of the waiting happens.
- Excavation, foundation and framing: 3–5 weeks.
- Weather-tight — roof, wrap, windows and doors: fast. We sequence to weather-tight before anything else matters, so your house isn't open through two rainstorms.
- Plumbing, electrical, heating and the rough inspections: 2–4 weeks.
- Insulation, drywall, floors, trim, paint, fixtures and the final inspection: 4–8 weeks.
- Total for a primary suite: roughly 4–7 months from drawing to done. A full second story runs longer.
What a real addition quote looks like
One contract: design, permits and build. An itemized price with every line visible — foundation, framing, roofing, siding, windows, plumbing, heating, electrical, finishes, permits. A finish date. And the Price-Lock Guarantee: the number can't change without your signature on a written change order.
No deposit. You pay as the work gets done. No franchise fees, no commissioned salesmen and no rented subcontractors, which is how we typically land 15–30% under national-brand quotes for the same or better spec. Bring us any written quote and we'll match the scope line by line.
Questions people ask next
Do I need an architect for an addition in NJ?
Almost always, yes. Your town wants sealed drawings for the building permit, and a structural engineer for beams, foundations and anything that carries a second floor. We manage the architect and engineer as part of the job, so you're not chasing three offices.
How long do addition permits take in North Jersey?
Most towns issue within 3–8 weeks of a complete submission. If you need a zoning variance, add months and a public hearing. We check the zoning at the consultation so you know which path you're on before you spend a dollar on drawings.
Can I live at home during the addition?
For a ground-floor addition, usually yes. The new space is sealed off from the house until the last step, when we open the wall between them. A full second story is different — with the roof off, most families move out for a few weeks. We tell you which before you sign.
Will an addition raise my property taxes?
Most likely. The town reassesses when you add living space, and the increase depends on your town's rate and what you built. Factor it in. We can quote the addition to the dollar, but we can't quote your tax bill.
Need home additions near you?
If you searched “home additions near me” anywhere in New Jersey, that's us. First Call Contracting is based in Paramus and sends its own licensed crew to all 21 counties — written price before work starts, no deposit, a real person on the phone 24/7.
Love your block? Stay on it — bigger.
Free in-home consultation. Design, permits and build under one contract, one fixed price, one crew.
Or call Alex direct: (201) 676-3099