Roof replacement cost calculator

Four easy steps. Your price shows up right away. No email, no phone number.

Quick answer

$14,550 to $31,871^[2] for a big shingle roof.

That is the published range for a full job on a 3,000 sq ft roof in the U.S. Pick your own size, roof type and state below to see yours.

How the math works

Every number in the math below comes from a public source. Each source is listed at the bottom of this page.

Nothing is changed behind the scenes. Here are the steps.

1. We turn your roof size into squares. One square is 100 sq ft.
2. We add a little extra for cuts. Then we price the shingles and the layer under them.
3. We price the crew's work. Then we move it up or down by your state's pay score.
4. If you take off the old roof, we add the dump fee.
5. We add your permit fee, if you typed one in.
6. Last, we show the published price range for a full job your size.

Squares         = roof area ÷ 100 sq ft
Order           = squares × (1 + overage)
Shingles        = order × 3 bundles, rounded up, × bundle price
Underlayment    = rolls of 1,000 sq ft × $119
Labor           = Xactware labor ($7,108 to $7,500 per 2,500 sq ft)
                  ÷ 2,500 sq ft × your area × state pay score
Pay score       = state median roofer wage ÷ $26.65/hr
Dump fee        = squares × 235 lb ÷ 2,000 × $63.48/ton
Permit          = the fee you enter
Full-job range  = $4.85/sq ft × area, up to the Cost vs Value
                  regional cost ÷ 3,000 sq ft × area

Material prices are Home Depot list prices on the day we checked^[5]. We use the bulk price once the order is big enough.

Labor comes from Xactware numbers shared by Thumbtack^[1]. We move it by the state's middle roofer pay from the Bureau of Labor Statistics^[4]. Metal roofs use Xactware's metal labor number.

The dump fee uses the Cost vs Value shingle weight^[3] and the U.S. average landfill fee^[11]. The top of the full-job range is the Cost vs Value price for your region^[2].

Example: the starting roof

The calculator starts with a 3,000 sq ft^[3] roof of thick shingles. It uses U.S. average labor. The old roof comes off. It adds 10%^[10] extra. There is no permit. Here is what it shows:

Measure your roof

1. Measure the outside of the house at ground level.
2. Add the part of the roof that hangs past the walls.
3. Times the length by the width. That is the footprint.
4. Times the footprint by the number for your roof's slope in the table.

Slope means how many inches the roof rises for every 12 inches across. The numbers in the table are plain math, not survey data.

Add porch roofs and dormers on their own. Does your quote list the number of squares? Then times it by 100 sq ft and use that. It is often the best number you will have.

Take off the old roof, or cover over it?

Step 4 changes more than the dump fee. In many places, you do not get to choose.

The 2021 model building code (the IRC) says a new roof means taking the old one off, down to the boards. You cannot cover over it if:

• the old roof is soaked with water or too worn out to build on,
• the old roof is slate, clay or cement tile, or
• there are already two or more layers^[13].

Your state or city may change these rules a bit.

Florida adds a size rule. You can fix up to 25%^[14] of a roof (or one part) in a year. Past that, the whole roof or part must meet today's code. Roofs built under the 2007 code or later have an exception^[14]. Is your quote for part of a roof? Ask how this rule fits.

Whatever the job, get it in writing. The roofing trade group NRCA says the plan should list the work, dates and how you will pay^[15].

What the calculator can't tell you

• If your roof boards need to be replaced. Nobody knows until the old roof is off.
• Local code extras, like extra nails for high wind or ice rules.
• Prices for standing-seam metal and tile materials, or labor for tile and flat roofs. We have no public source yet, and the result says so.
• How busy roofers are near you this season. That can move prices more than any line above.