Cost tool
Roofing Cost Calculator
Enter the footprint, the pitch, and what is on the roof now. The figure adjusts for your town, the age of the house, and the condition of the deck, which is the part nobody can see until the old shingle comes off.
No town pages are live yet in this state.
The ground footprint of the house, not the roof surface. We convert it using the pitch.
Default to some repair on anything pre-1940: that sheathing is board, not plywood.
Estimated roof replacement
$11,700to$16,600
- Architectural asphalt, 2016 sq ft
- $11,600
- Deck allowance
- $500
- Ice and water shield at the eaves
- $500
Sheathing cannot be assessed until the old shingle is off.
What could change this
- Flashing at every valley, sidewall, and chimney, which is where most leaks start
- Chimney condition, since a rebuild or a new crown is separate work
Ranges are estimates for this market based on typical scope. They are not quotes. Actual pricing depends on the house, access, and what turns up once work starts.
Cost data reviewed 2026-09-01
How this is calculated
The footprint is multiplied by a pitch factor to get actual roof surface, because a 10:12 roof carries roughly 40 percent more material than its ground footprint suggests. That surface area is priced at the installed rate for the material selected, then adjusted for tear-off layers, deck repair, ice and water shield at the eaves, and roof complexity.
Two geographic adjustments follow. A state labour multiplier, then a regional one keyed to your town, because the same roof costs substantially more in Fairfield County or Greater Boston than in the Blackstone Valley or the Pioneer Valley. Housing stock modifiers apply last: pre-1940 construction, a historic district, and coastal exposure each add a documented percentage.
The output range is deliberately asymmetric, running from 15 percent below the calculated figure to 20 percent above. Roofing overruns more often than it underruns, because what is under the shingles is genuinely unknown until the tear-off.
What this tool cannot know
Every one of these matters to the final number and none of them can be read off a form. They are the reason the output is a range and the reason a contractor still has to look at the house.
- The actual condition of the sheathing, which is why the deck allowance is an input rather than a certainty
- Chimney condition, since a rebuild or a new crown is separate work that frequently comes up during a re-roof
- Whether the attic ventilation is adequate, which determines whether ice dams come back
- Access constraints on your specific lot, which move labour more than most people expect
Common questions
Because you can measure a footprint and most people cannot measure a roof. The pitch selection converts one to the other. If you already know your roof surface area, enter a footprint that produces it: divide the surface by the pitch factor shown for your selection.
Anything built before roughly 1950 has board sheathing rather than plywood, and after a century those boards split, cup, and rot at the eave. Some percentage almost always needs replacing. Defaulting it on produces a more honest number than discovering it on day two of the job.
No. It is an estimate for this market based on typical scope. Actual pricing depends on your house, the access, and what turns up once work starts. Use it to know whether a quote you receive is in a sensible range, not as a number to hold a contractor to.
Labour rates vary substantially across these three states, and the difference between the highest and lowest cost markets here is over 50 percent on the same work. The regional multiplier is applied from the town you select rather than from a single state average.