The honest answer first
Nobody can price your roof without measuring it, and most of the numbers you will find online for "roof replacement cost in your town" are modeled from national averages rather than taken from local jobs. Eight sites can give eight different ranges for the same city. This site prints only figures a public record gives, and there are few of them.
The clearest public figure in the six states this site covers comes from Boston, where every roof permit carries a value declared by the applicant:
- In 2025 the City approved 963 roofing permits for one- and two-family homes.
- The median declared value was $14,000; the middle half fell between $9,600 and $20,000.
A declared value is the applicant's estimate on a permit form, not a final invoice, and Boston houses are not your house. It tells you the scale of the job, not your price.
What makes two quotes far apart
The written estimate from a contractor who has been on the roof is the number that counts. These are the lines that move it.
1. Layers: tear-off or recover
The residential code lets a new roof go over one existing layer. Where the roof already has two or more layers, or the old covering is slate, clay or cement tile, or it is water-soaked or deteriorated, everything has to come off to the deck first (IRC R908.3.1.1; Florida's version is FBC Existing Building 706.3). Removal and disposal are a large part of the labor. See tear-off or roof over.
2. The deck
Once the old roof is off, rotted or damaged sheathing is replaced by the sheet. Quotes handle it differently: some include a number of sheets, others price every sheet found. Ask which, and get the per-sheet price in writing.
3. Underlayment and ice barrier
On asphalt shingles at a slope from 2:12 up to 4:12, the code requires a double layer of underlayment (IRC R905.2.2). In Massachusetts, Connecticut and Rhode Island every reroof also gets an eave ice barrier; in New Jersey only Sussex County requires one; in Pennsylvania the municipality's climate table decides (ice barrier by state). Connecticut adds a membrane strip over every joint of a plywood or OSB deck.
4. Florida's extra work
On a site-built single-family house permitted before March 1, 2002, a full replacement must include a secondary water barrier and re-nailing of the roof deck (Fla. Stat. § 553.844(3)). For a higher-value house in the wind-borne debris region, roof-to-wall connections are improved too, capped at 15 percent of the reroofing cost. See replacing a roof in Florida.
5. Material
HUD's useful-life table for capital needs assessments gives asphalt shingles 20 years, metal 50, slate 75, clay or concrete tile 60, and EPDM or TPO membranes 15. The difference in price between materials is wider than any other line on a quote. Materials compared.
6. The permit
Fees are set locally. Philadelphia charges $69 for an EZ permit to replace the roof covering on a one- or two-family house. Boston's short-form permit is "$20, plus $10 per $1,000 of estimated cost." A detached one- or two-family house in New Jersey needs no permit for a new covering at all. Permits by state.
7. The house
Stories, pitch, valleys, dormers, skylights, chimneys, and on rowhouses the party walls and the way up: each adds labor. A steep roof needs more safety setup; a low one may need a different material entirely.
Floor area is not roof area
A 2,000-square-foot house does not have a 2,000-square-foot roof. The pitch, the overhangs, a second story over part of the house, porches and dormers all change the area. That is why the contractor measures first.
Questions people ask
Does a new roof qualify for a tax credit? Not under the federal energy-efficient home improvement credit (25C): roofs are not on its list, and the credit ended for property placed in service after December 31, 2025, according to the IRS.
Can I pay over time? Some contractors arrange it. If one does, get the APR and the total cost in writing before you sign.
Why do other sites show a price for my town? Most model it from national averages. Ask any source where its number comes from.
By state
What each state's code and permit rules add: Pennsylvania, New Jersey, Massachusetts, Connecticut, Rhode Island, Florida.
Questions
How much does a roof replacement cost?
Nobody can price a roof without measuring it. In Boston, the 963 roofing permits approved in 2025 for one- and two-family homes had a median declared value of $14,000, with the middle half between $9,600 and $20,000; those are applicants’ estimates on a permit form, not invoices, and not a price for any other house.
Why do roofing quotes vary so much?
The lines that move a quote are the tear-off and the number of layers, deck sheets replaced, underlayment and ice barrier, state extras such as Florida’s work on older houses, the material, the permit fee, and the house itself: stories, pitch, valleys, dormers, skylights and chimneys. The gap between materials is wider than any other line.
Does a new roof qualify for a federal tax credit?
Not under the federal energy-efficient home improvement credit (25C). Roofs are not on its list, and according to the IRS the credit ended for property placed in service after December 31, 2025.
Is my roof area the same as my home’s square footage?
No. A 2,000-square-foot house does not have a 2,000-square-foot roof: the pitch, overhangs, a second story over part of the house, porches and dormers all change the area, which is why the contractor measures first.