You have three quotes. One is $8,400, one is $11,900, one is $14,200. They are all for “a new roof.” What actually differs?
Almost always: the scope. The cheapest quote is rarely the same work for less money — it is usually less work. Here is how to see that.
First: demand line items
A quote that says “Complete roof system — $9,800” is not a quote you can evaluate. It is a number. Ask every contractor for line-item pricing that names the actual materials and quantities.
Some will resist. That resistance is information.
The eight things to compare
1. Tear-off or layover? Is the old roof coming off, or is new material going over it? A layover is meaningfully cheaper and hides the condition of your decking under a roof meant to last twenty years. It also voids enhanced manufacturer warranties. If one quote is dramatically lower, check this first.
2. Decking replacement terms. Nobody can know how much rotted sheathing is under your shingles until tear-off begins. A good quote states the per-sheet price up front. A quote that is silent on this is one where you will be negotiating from a position of no leverage with half a roof open.
3. Underlayment. Synthetic underlayment across the whole deck, or 15-pound felt? Is there self-adhering ice and water membrane in the valleys and around penetrations, or only felt? This is a real cost difference and a real performance difference.
4. Flashing — new or reused? Step flashing, counter flashing, valley metal, drip edge, and pipe boots. Reusing old flashing is the single most common corner cut in residential roofing, and flashing failures cause more leaks than shingle failures do. The quote should say “new.”
5. Ventilation. Does the quote address intake and exhaust, or only replace what is there? Many homes in the Carolinas have inadequate soffit intake. A contractor who measured your attic and priced a correction is doing the job properly; one who ignored it is not.
6. The specific shingle. Not “architectural shingle” — the manufacturer, the product line, and whether it is algae-resistant. In our humidity, algae resistance is worth having. Line items should name the product.
7. Both warranties, in writing. The manufacturer’s material warranty and the contractor’s workmanship warranty are different documents from different companies. Get the term of each. “We stand behind our work” is not a warranty.
8. License, insurance, and where they are. License number, liability coverage, and workers’ compensation. Verify them rather than taking a business card’s word. And check for a real local address — a workmanship warranty from a company that leaves the market in two years is worth nothing.
The comparison that actually matters
Once you have line items from all three, the differences usually explain themselves. The cheap quote is a layover with reused flashing and felt underlayment. The expensive one includes ventilation correction and a premium shingle line. The middle one might be exactly right.
At that point you are making an informed decision instead of a coin flip.
One more thing
Be cautious of urgency that comes from the contractor rather than from your roof. “This price is only good today” is a sales technique, not a business reality. A roof that has lasted twenty years will last another week while you compare quotes properly.
If you want a line-item estimate to compare against whatever else you have, ours are free and we will not pressure you on the spot. Bring the other quotes — we are happy to walk through what the differences actually mean.
Written by Old North State Roofing · Published June 24, 2026