How to Read an Insurance Roof Estimate: Line Items, Depreciation, and Supplements

An insurance roof estimate is a scope of work before it is a price: check the measured roof area, the layers it removes and the code items it includes against your actual roof and your contractor’s scope. Missing items go back to the insurer as a written supplement request with evidence, and those scope gaps can hide more money than the unit prices do.

Arguing the price per square first gets the order wrong. A fair unit price on a roof that is measured short, with one layer of tear-off instead of two and no ice barrier, still produces a short check. Read the estimate in its own page order, and mark what is missing as you go.

Start With the Summary: Coverage, Deductible, Payment Type

The summary page tells you how the claim is being settled before you look at a single line item. Find these figures:

• Replacement cost value (RCV): the total price of the approved scope.
• Depreciation: the amount subtracted for age and wear, split into recoverable and non-recoverable where the policy allows recovery.
• Actual cash value (ACV): RCV minus depreciation.
• Deductible: the amount subtracted from the payment.
• Net claim and prior payments: what is being paid now and what has been paid already.

Then check the settings against your policy: the settlement type the estimate applies should match your declarations page, and so should the deductible, including any separate wind, hail or hurricane deductible. For where these settings sit in a policy, see the policy sections that decide roof coverage.

Check Measurements Against the Roof You Have

Quantities multiply every unit price, so check them before anything else:

• Roof area, in squares of 100 square feet each. Compare it with your contractor’s measurement, whether from an aerial report or a tape. The guide to what a roofing square is explains how area and pitch combine.
• Pitch, listed per slope. A steeper pitch changes both area and labor lines.
• Linear items: ridge, hips, valleys, eaves and rakes, each in feet. These set starter, ridge cap, drip edge and valley lining quantities.
• Every roof section: porches, bay windows, dormers and an attached garage are easy to leave out.
• Waste: the estimate may add a waste allowance on top of the measured area. Ask the insurer in writing what waste figure it used and why, and compare it with your contractor’s.
• Stories and steepness charges: a two-story roof or a steep slope can carry extra labor or safety lines; check they are present if they apply.

If the insurer’s area and your contractor’s area differ, ask each to show the measurement source and the slope-by-slope numbers. A small difference per slope adds up across a full roof.

Tear-Off, Layers, and Decking Lines

Removal lines are easy to undercount. Have your contractor count the layers at the roof edge or a vent, then check that the estimate removes all of them.

Local code decides what has to come off. In Lincoln, Nebraska, the city’s December 2021 re-roof policy, which applies the 2018 International Residential Code (IRC) as the city adopted it, requires every layer to come off once a roof already carries two or more layers of any kind of covering. The City of Bloomington, Minnesota’s June 2023 reroofing sheet says the state code “allows for a total of two layers of asphalt shingles before tear off is required.” If your roof has two layers and the estimate prices one, that is a supplement item with your contractor’s photo as proof.

Decking is the other hidden line. The full extent of damaged or rotted sheathing may not show until tear-off, so the estimate may carry no decking at all. Ask in writing how the insurer will handle decking found damaged during the job, and have your contractor photograph every sheet before it is replaced, with a tape measure in the frame.

Code-Required Items Estimates Leave Out

Code items are another place an estimate can fall short, because the old roof may never have had them. The first four rows use the same two local documents as examples; confirm your own list with your building department. The last two rows are not code items in those documents, but estimates can leave them out the same way:

Lincoln requires drip edge and Minnesota’s code requires it only when the shingle maker does, so the only list that settles a disputed line is the one your building department enforces.

Whether the insurer pays for code items the old roof lacked depends on your policy’s ordinance or law coverage and its limit, which ordinance or law coverage for roof claims explains. Either way, they belong on the estimate so the question gets answered.

Depreciation Columns and Totals

Line items carry a depreciation figure, and the summary adds them up. Check three things:

1. The age used. The roof age behind the depreciation should match your records. If the insurer used the house’s build year for a roof that was replaced later, send the permit or invoice.
2. Recoverable vs. non-recoverable. Replacement cost pays to replace a damaged item “without deducting for depreciation,” in the words of the Insurance Information Institute’s explainer on how the settlement amount is determined. If your roof is covered at replacement cost, ask in writing why any roof line is marked non-recoverable, and which endorsement the insurer relies on.
3. The release conditions. The NAIC Post-Disaster Claims Guide explains that the insurer may pay the rest of a replacement cost claim “when you present evidence that the damaged property has been repaired or replaced.” Texas homeowners face one more condition: Insurance Code Chapter 707 allows the insurer to hold recoverable depreciation until you prove you paid your deductible.

The math of the two payments, and the steps to collect the holdback, are in actual cash value vs. replacement cost for roofs.

Requesting a Supplement

A supplement is a written request to add or correct items on the estimate. Send one when you find a gap, and send another if the crew finds hidden damage during the job. Include:

1. Claim number, date of loss and the estimate date you are responding to.
2. Each missing or short item as its own line, with the quantity your contractor measured.
3. Evidence for each: photos, the contractor’s measurement report, the building department’s code list, and photos of hidden damage taken during tear-off.
4. The contractor’s itemized price for each added line.
5. A request for a revised estimate in writing.

If your contractor’s scope includes overhead and profit and the insurer’s estimate does not, ask in writing how the insurer decides whether it applies to your claim.

Watch the clock. Florida’s notice statute, section 627.70132 in the 2026 Florida Statutes, gives you 18 months after the date of loss to give notice of a supplemental claim. Other states and policies set their own limits, so check yours before you wait for the job to finish.

Is This Estimate Ready to Sign a Contract Against?

It is ready when four things are true: the measured area and linear items match your contractor’s numbers or the difference is explained, every existing layer is removed if your code requires it, each code item your building department lists appears as a line, and the deductible and depreciation match your policy. If any of those fail, send the supplement first and sign after the revised estimate arrives. If the insurer refuses the supplement, the denial guide matches the response to the reason, and a public adjuster is the paid option.

When you compare contractors against the final estimate, use the method in how to compare roofing quotes line by line, so each bid prices the same scope.

Mark each missing or short item on the estimate, attach photos and your contractor’s measurements, and send a dated supplement request.

This guide is general information for U.S. homeowners, not legal, insurance, tax, or engineering advice. Codes, laws, and policy terms vary by location and change over time; confirm details with your local building department, your insurer, or a licensed professional.

Sources

• How is the settlement amount determined?, Insurance Information Institute
• Re-Roof Policy, City of Lincoln, Nebraska, Building and Safety
• Reroofing, City of Bloomington, Minnesota
• Post-Disaster Claims Guide, National Association of Insurance Commissioners
• Insurance Code Title 5, Chapter 707: Payment of Insurance Deductible, Texas Legislature
• The 2026 Florida Statutes, 627.70132 Notice of property insurance claim, Florida Legislature (Online Sunshine)