How to Read and Compare Roof Estimates

To read a roofing estimate, start with the roof size in squares (one square is 100 square feet), then check each line: tear-off, decking, underlayment, shingles, flashing, ventilation, permits and warranties. Architectural shingle roofs usually cost about $450 to $750 per square installed, so a 20-square roof should come in near $9,000 to $15,000 before extras.

Comparing quotes well comes down to four steps.

1. Check the measurements. Every price on the estimate is based on the square count and waste factor, so confirm those first.
2. Read each line item. A good estimate names the shingle line, the underlayment, the flashing and the ventilation, and gives a per-sheet price for decking.
3. Get three written quotes. Three bids for the same scope make an outlier easy to spot.
4. Compare item by item, not by total. The cheapest bid is often a smaller job, and the red flags section below shows what to look for.

Roofers price everything per square, plus waste

Roofers price everything per square. They measure the roof surface, divide by 100, and charge for material and labor on that number, so 2,000 square feet of roof is 20 squares. The figure is usually larger than your floor area because a pitched roof has more surface than its footprint.

The shingle quantity always includes a waste factor for pieces cut at valleys, hips and rakes. A plain gable roof needs about 10 percent; a cut-up roof with dormers and valleys needs 15 to 20 percent. If the roof is 20 squares and the estimate lists 23 squares of shingles, that is a 15 percent allowance, and it should match your roof's shape. Padded waste quietly raises the material line.

Many roofers now measure from aerial photos. That works for area but cannot show rotted fascia or a chimney with crumbling mortar, so the better bids come from someone who has been on the roof. Before anyone visits, get a ballpark square count from the roofing calculator so you have a figure to check each bid's first line against.

Tear-off costs $100 to $150 per square for each layer

Removal of the old roof costs about $100 to $150 per square for each layer of shingles. A second layer costs the same again, since the crew hauls double the weight. If the estimate does not say how many layers are coming off, ask.

Disposal should be its own line or clearly included. Most crews rent a roll-off dumpster for $400 to $600, depending on landfill fees, and a 25-square tear-off produces a few tons of shingles and nails. A vague "debris removal" line is not enough detail.

Decking is the main unknown, because nobody can see the plywood or OSB until the shingles are off. A good estimate quotes a per-sheet replacement price, usually $70 to $120 for a 4x8 sheet installed, and some include a few sheets at no charge. An estimate with no per-sheet price is how a reasonable bid turns into a large surprise on install day.

Underlayment, ice shield and valleys

Underlayment sits between the deck and the shingles and is either felt (15- or 30-pound) or synthetic. Synthetic is now standard. It resists tearing, does not absorb water if it rains mid-job, and adds only about 15 to 30 cents per square foot.

Ice and water shield is a peel-and-stick membrane for eaves, valleys and penetrations. In cold areas, code usually requires it from the eave to at least 24 inches inside the exterior wall line. If you live in snow country and it is not on your estimate, the roof is not being built to code.

Valleys carry more water than any other part of the roof, so the estimate should say how they will be built. A closed-cut valley overlaps shingles from both sides over a membrane. An open valley uses exposed metal, often a W-shaped aluminum or copper channel, and adds roughly $15 to $25 per linear foot.

The estimate should name the shingle brand and line

Shingles are the largest material cost, and the estimate should name the brand and line, such as GAF Timberline HDZ or Owens Corning Duration, not just "architectural shingles." The name lets you compare like for like and look up the wind rating and warranty yourself. Architectural shingle material alone runs about $105 to $165 per square.

Starter strips run along the eaves and rakes with a line of adhesive that keeps the edges from lifting in wind. Some crews cut up regular shingles instead to save money. A good estimate lists the manufacturer's starter product, which many system warranties require.

Ridge cap is a thicker, pre-bent shingle that folds over the peak without cracking. Standard caps cost about $2 to $3 per linear foot and high-profile caps run $5 to $8. The estimate should say which you are getting.

Drip edge, flashing and pipe boots

Drip edge is the metal trim along the eaves and rakes that directs water into the gutters instead of the fascia. It costs about $2 to $4 per linear foot, and current codes generally require it. Check that its color matches your gutters or trim.

Flashing seals the joints where the roof meets a wall or chimney. Step flashing runs up sidewalls, one L-shaped piece per shingle course, and counter flashing tucks into the chimney's mortar joints to cover it. Re-flashing a chimney typically costs $300 to $700. Lines such as "seal chimney" or "caulk as needed" signal a shortcut; reused flashing is one of the top causes of leaks in young roofs, so ask for "new flashing throughout" in writing.

Pipe boots seal around plumbing vents. Basic rubber boots often crack long before the shingles wear out, while silicone or lead boots cost a little more and last as long as the roof. The estimate should list how many and what type.

An estimate without ventilation is incomplete

An estimate without ventilation is incomplete. It should name the exhaust, either ridge vent at roughly $7 to $15 per linear foot or box vents at about $75 to $150 each, and confirm there is enough intake at the soffits. On a house with no overhang, edge intake vents can add $500 to $1,500.

Ask how the contractor sized the system. Code calls for net free vent area of 1/150 of the attic floor, or 1/300 under certain conditions, split between intake and exhaust. Shingle manufacturers can deny warranty claims when ventilation falls short, so the estimate should state in writing that the system will meet code and the manufacturer's requirements.

How much of a roofing estimate is labor?

Labor is usually about half the price, roughly $150 to $300 per square depending on region and roof complexity. Steep roofs (about 7/12 and up) carry a charge of $20 to $60 per square for extra safety gear and slower work, and two- and three-story houses may carry a height charge. These charges are fair, but they should appear as their own lines rather than hidden inside a material price.

Overhead and profit (O&P) appears as a separate line on insurance estimates, often 10 percent each, while retail bids build it into the unit prices. Either way, you should get a firm total. Rotted decking is a legitimate unknown, but base labor and material prices are not.

Permits usually cost $100 to $500, and the estimate should say the contractor pulls the permit and the fee is included. A roofer who asks you to pull it yourself as an owner-builder may be avoiding licensing or responsibility. In high-wind areas, also look for the nailing pattern, such as six nails per shingle.

Cleanup should include a magnetic sweep for nails, cleaned-out gutters, and tarps or catch-all netting over windows, siding and plants.

Manufacturer and workmanship warranties cover different things

An estimate can include two different warranties. The manufacturer's warranty covers defects in the shingles. Standard "limited lifetime" coverage is often prorated and may pay for materials only, not the labor to install them. Upgraded system warranties from certified installers can cover labor and materials for longer without proration, usually for an added fee.

The workmanship warranty comes from the roofer and covers installation mistakes, which cause most leaks. Two to ten years is typical. Consider who is making the promise: a lifetime warranty from a company that opened two years ago is worth less than five years from one with decades in business. The roof warranty guide explains the brand tiers.

Get three quotes so the outlier stands out

Three quotes is the right number. FEMA advises: "Get two or three written estimates. This will allow you to compare bids." One quote gives you nothing to compare, and two that disagree leave you guessing. With three, an outlier stands out: if two roofers bid a 25-square roof at $12,000 to $13,000 and a third says $18,000, you know where to ask questions.

Start with local contractors that have a real address, a license if your state requires one, and reviews going back years. Give each one the same brief, with the same shingle grade, scope and questions, so you are comparing the same roof.

Get everything on paper. The National Roofing Contractors Association tells homeowners to insist on a written proposal with "complete descriptions of the work and specifications," plus start and finish dates and payment terms. It also recommends getting copies of the contractor's liability insurance and workers' compensation certificates. Call the insurance agent to confirm the policy is active, since a photocopy proves nothing.

Timing affects price. Late summer and fall are peak season, when calendars fill and contractors have little reason to negotiate; late fall and early spring can bring better numbers. After a major hail or wind storm, out-of-town storm chasers arrive, so rely even more on established local companies.

How do you compare roofing quotes?

Compare line items before totals. Make a simple table with one row per item and one column per roofer: squares and waste, layers removed, decking per sheet, underlayment, ice and water shield, shingle line, starter and ridge cap, drip edge, flashing, pipe boots, ventilation, permit, cleanup, workmanship warranty and payment schedule. The gaps show up quickly.

Then make the bids equal. If one uses felt and reuses flashing while another includes synthetic underlayment and new metal, the cheaper one is a smaller job, not a better price. Ask the low bidder to price the missing items so all three cover the same work.

Check the measurements as well. If one roofer counts 25 squares and another counts 29, someone measured wrong or padded the waste, and your own square count will show which.

The middle quote is often the best value, with enough margin to carry real insurance and a real office but no premium for an overbooked schedule. For the lowball bid, the NRCA's warning applies: "If it sounds too good to be true, it probably is."

What are the red flags in a roofing estimate?

The biggest warning sign is a one-page estimate with a single price and the words "install new roof." Without detail, materials can be swapped mid-job and you have nothing to hold the crew to.

Watch the payment terms. The Federal Trade Commission warns, "Don't pay the full amount for the project up front." A 10 to 33 percent deposit to order materials is normal, and some states cap it. Requests for half or more upfront, cash only, or a discount for cash are warning signs. Pay by check or card so there is a record.

Other red flags include:

• No per-sheet decking price.
• Nothing about ventilation or flashing.
• A roofer who never went into the attic or onto the roof.
• Pressure to sign the same day.
• An estimate that matches an insurance payout to the dollar without explaining the scope.

Low bids that skip items often return as change orders once the old roof is off.

Settle the crew, materials and schedule before you sign

Before you sign, find out who supervises the job on site each day and whether the crew are employees or subcontractors. Confirm the brand of every component, from drip edge to nails, and that shingles will be fastened in the manufacturer's nailing zone with roofing nails, not staples.

Agree on the start date, the expected duration, and the plan if it rains during tear-off, along with how plants, siding and windows will be protected. Look at real shingle samples in daylight before anything is ordered. Then check the contract for the right-to-cancel notice, the full payment schedule and the final inspection. A clear, itemized estimate is your best protection, and the guide to choosing a roofing contractor covers the vetting that comes before it.

Prices are 2026 US national averages and building codes vary by town. Materials, warranties and code adoptions change, so confirm prices with local contractors and code rules with your building department before you sign anything.