Free · Instant · No obligation
See what your home addition will cost — in 60 seconds.
Answer a few quick questions about the addition you're planning. We'll give you a realistic cost range on the spot, based on 16 years building additions across North Jersey. No call required, no pressure.
16 years · 500+ projects · 98% first-time inspection pass
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Instant Home Addition Cost Calculator
Get your range in under a minute
What are you adding?
Pick whichever is closest.
What your estimate is buying
The math behind an addition that holds its value.
These are the details that decide whether an addition still feels solid in a decade — and they're all built into the number you'll see in 60 seconds.
The foundation
The foundation decides everything.
Footings, excavation, soil, and a code-compliant foundation are the base every addition stands on — and the place hidden surprises live. Your estimate prices the dig, not just the walls.
Price my addition
The framing
Framing decides what you can actually build.
Stick framing, floor joists, the roof tie-in — the bones of your addition. Skimp here and everything downstream suffers. Your estimate prices real structural lumber, engineered to span the space.
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The roof tie-in
The roof tie-in is the seam nobody mentions.
Where the new roof meets the old is where every addition leaks — if it's done wrong. Proper step flashing and ice-and-water membrane are the detail that keeps your addition dry for thirty years.
See the costThe space
Every square foot has a price.
An addition is bought by the square foot — foundation, framing, systems, finishes, all multiplied by size. Your estimate breaks that rate down so you see exactly what each extra foot costs.
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The mechanicals
Mechanicals are the hidden second budget.
Extending HVAC, electrical, and plumbing into the new space is a whole second budget most quotes bury. Your estimate prices the ductwork, runs, and panel capacity to actually heat and power the room.
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The result
The room that pays for itself.
A well-built addition adds square footage, livability, and resale — done right, it appraises for more than it costs. One realistic cost range on your screen in 60 seconds, no call, no pressure.
Get my estimateWhy you can trust this number
An estimate is only as good as the experience behind it.
16 years in North Jersey
We know what additions actually cost to build here — permits, engineering, soil, the works — not a national average that's never poured a footing in Bergen County.
98% first-time inspection pass rate
Footings, framing, rough-in, and final inspections — the ones that stall other projects for weeks. Our estimates reflect work that passes the first time.
Real local material & permit rates
Pricing reflects what lumber, concrete, labor, and North Jersey permit fees actually cost in 2026 — from trade pricing we pass on to you.
500+ projects completed
This range isn't a guess. It's grounded in hundreds of real projects — many of them additions just like the one you're planning.
