How to Read a Roofing Estimate, Line by Line

Two estimates for the same roof often look nothing alike. One is a single number. The other runs two pages. Here's how to read them side by side.

Roof size in squares

Roofers price by the square. One square covers 100 square feet of roof surface. A 2,000 square foot roof is 20 squares before waste. Every quote for the same roof should show close to the same number of squares. A big gap means someone measured wrong.

Our estimator emails you your roof's measured surface area and squares, so you have a reference before anyone visits. Check your roof.

Waste factor

Crews order extra material for cuts, hips, valleys and ridges. Simple roofs usually need about 10% extra. Steep or cut-up roofs need about 15%. A quote with 30% waste deserves a question.

Tear-off and disposal

Removing the old roof costs labor and dump fees. Each extra layer of old shingles adds more. Ask how many layers the roofer found and whether disposal is included.

Decking

Decking is the plywood or boards under the shingles. Nobody knows how much is rotted until the old roof comes off. A fair estimate lists a price per sheet for replacement, so the extra cost has a ceiling. Avoid open-ended "as needed" language with no unit price.

Underlayment and ice and water shield

Underlayment is the layer between the decking and the shingles. Ice and water shield is a sticky membrane for the weakest spots, like eaves, valleys and around chimneys. Codes in colder regions often require it along the eaves. The estimate should name both products.

Drip edge and flashing

Drip edge is the metal strip along the roof edges. Flashing seals walls, chimneys, skylights and valleys. Most leaks start at flashing, not in the middle of the shingles. Ask whether the roofer replaces flashing or reuses the old pieces.

Ventilation

Ridge vents, box vents and soffit vents let the attic breathe. Poor ventilation shortens shingle life and may void a manufacturer warranty. The estimate should say what ventilation goes on the roof.

The shingle or material line

Look for the brand, the product line and the color. "Architectural shingles" alone leaves room for a cheaper product. If you want impact-resistant shingles, the estimate should say so by name.

Permit and inspection

The permit fee belongs on the estimate, and the roofer should pull it. Permits typically run a few hundred dollars depending on the town.

Warranty and payment terms

The last section should spell out the workmanship warranty, the manufacturer warranty and the payment schedule. Pay a reasonable deposit, never the whole price before work starts.

Red flags

• One lump-sum price with no line items.
• No square count or a count far from the other quotes.
• Decking listed as "as needed" with no price per sheet.
• No mention of the permit.
• A price that expires the same day.

Frequently asked questions

Why are my roofing quotes so different?

Different square counts, different products and different assumptions about decking cause most of the gap. Line the estimates up item by item to find it.

Is a higher quote always better quality?

No. Compare what each quote includes. Sometimes the higher quote covers flashing, ventilation and a longer warranty. Sometimes it's only higher.

What does a new roof cost in 2026?

See our roof replacement cost guide for prices by material and state, or check your own address for a measured range.

Savannah Lee

Founder of RoofClarity and Roofer Marketing Solutions. About 15 years in the roofing industry, working with roofing companies across the country. About Savannah