How to Read a Roofing Estimate
What the line items on a roofing estimate mean, from squares and waste to underlayment, flashing and decking, and how to compare quotes fairly.
Two roofing estimates for the same house can look completely different. Knowing what the line items mean helps you compare them fairly, and spot what's missing.
Squares and waste
Roofs are measured in squares. One square is 100 square feet of roof surface. Estimates also add a waste factor for cuts at valleys, hips and edges; more complex roofs need more. A quote that's much cheaper may simply be measuring fewer squares or skipping waste.
Line items to look for
- Tear-off and disposal, including how many existing layers are being removed
- Shingle brand, product line and color
- Underlayment type, and whether leak barrier goes in valleys and around penetrations
- Drip edge, starter strip and ridge cap
- Flashing: new or reused at walls, chimneys and skylights
- Pipe boots and roof vents
- Ventilation changes, if any
- Decking replacement, usually priced per sheet if needed
- Permits, where required, and cleanup
Warranty terms
Look for two warranties in writing: the manufacturer's material warranty and the contractor's labor warranty. Ask how long the labor warranty lasts and what it covers.
Comparing quotes
Line up the scope, not just the total. The cheapest bid often reuses flashing, skips leak barrier, or leaves decking replacement as a surprise. Ask each roofer to walk you through their estimate. A good one will be glad to.
Insurance estimates
If your roof is part of an insurance claim, your insurer's estimate will use its own format and pricing. Read it the same way, compare it to your roofer's scope, and ask your insurance company about anything you don't understand.