You’ve had three roofers out. You’re now holding three estimates that supposedly describe the same roof — and they’re thousands of dollars apart. One is a single line that says “Replace roof as specified.” One is four pages long. One is somewhere in between, but you can’t tell whether it includes new flashing or not.

Here’s the truth about comparing roofing bids: the totals are meaningless until you know what’s inside them. Most “cheap” bids aren’t cheaper labor — they’re thinner scope. This guide walks through every line a complete roofing estimate should have, what each one means, and where low bids quietly cut. (For what a full replacement actually runs in our market, see our Fort Wayne roof replacement cost guide — this article is about making sure the number you’re quoted describes a real, complete roof.)

1. Scope of Work: Tear-Off or Overlay?

The first thing to find is whether the estimate includes a full tear-off — removing all existing shingles down to the wood decking — or a layover (nailing new shingles over the old ones). A tear-off costs more and is almost always the right call: it lets the contractor inspect and repair the decking, install new underlayment and ice barrier, and give you a roof that qualifies for full manufacturer warranty coverage. Indiana allows overlays only in limited situations, and a bid that’s dramatically cheaper is sometimes cheaper precisely because it’s an overlay. The estimate should say which one it is, in writing.

2. The Shingle — Brand, Line, and Color

“Architectural shingles” is not a specification. The estimate should name the manufacturer and the exact product line — for example, GAF Timberline HDZ or Owens Corning Duration — because there’s a real difference in wind rating, warranty, and cost between an entry-level shingle and a premium one. If you’re weighing shingle grades, our 3-tab vs. architectural comparison and GAF shingle review cover the tradeoffs. Vague product language is how a “matching” bid ends up installing a builder-grade shingle you didn’t agree to.

3. Underlayment and Ice & Water Shield

Between the shingles and the decking are two layers you’ll never see again after installation day — which is exactly why they show up missing on cut-rate bids:

  • Synthetic underlayment across the entire deck (modern replacement for felt paper — see our underlayment guide)
  • Ice & water shield — a self-sealing membrane at the eaves, valleys, and penetrations. In Northeast Indiana’s freeze-thaw climate this is what stands between an ice dam and your ceiling, and code requires it at the eaves.

The estimate should state both products and where the ice barrier is applied. “Felt” only at the minimum, or no mention at all, is a scope cut you’ll pay for in February.

4. Drip Edge, Flashing, and Penetrations

Three small-dollar items that separate professionals from patch crews:

  • Drip edge at all eaves and rakes — required by Indiana code, routinely skipped by low bidders
  • Flashing — is chimney, wall, and valley flashing being replaced, or “reused where serviceable”? Reused flashing on a 20-year-old roof is a common source of year-one leaks
  • Pipe boots and vents — every penetration should get new boots and collars, not a bead of caulk on the old ones

5. Ventilation

A good estimate addresses how your attic will breathe: ridge vent, box vents, or whatever your roof design calls for, balanced against soffit intake. Poor ventilation cooks shingles from below and can void portions of the manufacturer warranty. If your current roof has ventilation problems, replacement day is the cheapest moment you’ll ever have to fix them — and an estimate that’s silent on ventilation usually means the crew will reinstall whatever was there.

6. The Decking Allowance

Nobody — not us, not anyone — can see the condition of your roof decking until the shingles come off. What a fair estimate does is name the price in advance: a per-sheet cost for replacing any plywood or OSB found rotted or delaminated during tear-off. (Here’s how decking replacement works and why it matters.)

If an estimate doesn’t mention decking at all, one of two things happens mid-project: you get a surprise change order at whatever price the contractor names while your roof is open, or — worse — bad wood gets covered over so the crew stays on schedule. Ask every bidder: “What’s your per-sheet price for decking replacement, and how will you show me what you found?” (The answer to the second half should be photos.)

7. Tear-Off Disposal and Site Protection

A tear-off generates a few tons of debris. The estimate should include the dumpster, haul-away, and disposal fees, plus site protection: tarping landscaping, protecting AC units, and a magnetic nail sweep of the yard and driveway at the end. These aren’t luxuries — they’re the difference between a crew that respects your property and a flat tire in your driveway three weeks later.

8. Permit

In Fort Wayne and Allen County, a roof replacement requires a building permit, pulled by the contractor, with a county inspection at the end. It should be in the estimate. A bid that excludes it — or a roofer who asks you to pull the permit — is telling you something important.

9. Warranties — Both of Them

Every complete estimate lists two separate warranties:

  • Manufacturer’s warranty on the shingles and roof-system components
  • Workmanship warranty from the contractor on the installation itself — the one that covers the far more common failure mode of installer error

The workmanship number varies wildly between contractors (one year? ten?), and it’s only as good as the company standing behind it — a consideration our Indiana roofing warranty guide covers in detail.

10. Payment Terms

Reasonable terms look like a modest deposit — commonly 10–30%, sometimes zero — with the balance due when the roof is complete and you’ve walked it with the contractor. Treat a demand for half or more up front as a serious warning sign, especially from a company that showed up after a storm. If cash flow is the constraint, ask about financing instead of front-loading payment to a contractor you met last week.

Comparing Bids: The Five-Minute Method

Take your estimates and build a quick grid — one row per item above, one column per contractor. Mark each cell: included, excluded, or not mentioned. “Not mentioned” is the category that decides most bids, because everything a contractor didn’t write down is something you can’t hold them to.

Then get the missing answers in writing before you sign. A professional roofer won’t hesitate; a corner-cutter will get vague. That reaction is itself information — and it pairs well with our no-BS contractor checklist for vetting the company behind the paper.

Frequently Asked Questions

Is the cheapest roofing bid always a bad idea?

Not always — but a bid that’s far below the others is cheap for a reason, and the reason is usually in the lines that are missing: overlay instead of tear-off, reused flashing, no ice barrier, no decking allowance, no permit. Make the scopes identical first; then compare prices.

How long should a roofing estimate be valid?

Most estimates hold their pricing for 30 days or state an expiration. Material prices move, so an estimate from last fall may honestly need re-quoting.

Can I ask a contractor to break out their pricing further?

You can ask anything. Many contractors price the job as a complete system rather than à la carte — that’s normal. What matters is that the scope is itemized in writing, even if the price is a single number.

Want an estimate you can actually read? Big Dog Roofing writes every line down — tear-off, materials, decking price, permit, and both warranties. Call 260-999-0347 or request your free inspection.