Most Douglas County asphalt replacements land roughly $10,000–$25,000, with metal running two to three times that — real money, and yet most homeowners compare bids on exactly one number: the total. That's how the worst bid wins.
The total tells you almost nothing. The line items tell you everything — what's going on your roof, what's being skipped, and what's going to show up as a surprise charge in week two. Here's the anatomy.
The anatomy of a legitimate estimate
A professional bid for a full replacement should itemize, at minimum:
- Tear-off. Removal of the existing roofing down to the deck. In Douglas County this isn't optional — shingle-over-shingle layovers aren't allowed here, so full tear-off is the law, not an upsell. A bid that's vague about tear-off is a bid worth questioning.
- Deck repair allowance, priced per sheet. Nobody knows what the plywood looks like until the old roof comes off. The honest approach: a set price per sheet of decking written into the estimate before the job, photos of anything found, and your approval before replacing more than the included amount. No allowance line means rot becomes a mid-job negotiation — one you'll lose, because your roof is open.
- Underlayment, by name. The waterproof layer under the shingles, doing the real work through an Oregon winter. You want a specific synthetic product named, not "standard felt" or — worse — nothing. This is the single easiest place for a low bid to hide its discount.
- Ice & water membrane. Self-adhering waterproof membrane in the leak-prone zones: valleys, around chimneys and skylights, along eaves. The estimate should say where it goes.
- Flashing. New flashing at walls, chimneys, and penetrations — including the kick-out flashing Douglas County requires at sidewalls. Watch for the word "reuse." Old flashing under new shingles is a leak on a timer, and it's one of the twelve questions we tell everyone to ask.
- Ventilation. Ridge vents, intake vents, or whatever the attic actually needs. Poor ventilation shortens shingle life and can void manufacturer warranties — an estimate that never mentions ventilation was written by someone who never looked in your attic.
- Disposal. Dumpster and dump fees. A tear-off generates tons of debris; someone pays to haul it, and you want that someone identified now.
- Permit. Reroofs over 100 square feet generally need one here. The pro pulls it and lists it. Our permit guide covers why skipping it bites you at sale time.
- Cleanup and magnetic sweep. Daily cleanup, landscape protection, and a magnet run over lawn and driveway. Cheap to write down, telling when absent.
Plus the obvious: the specific shingle brand and product line, the warranty terms (both manufacturer and workmanship — see our warranty guide for the difference), a payment schedule, and a working timeline.
Comparing bids apples-to-apples
Once bids are itemized, comparison is mechanical. Line them up and ask, for each row: same scope, same materials, same handling of surprises?
| Check | What a mismatch means |
|---|---|
| Same shingle line (not just brand)? | "Architectural" spans a wide quality range. A cheaper line can explain a $2,000 gap by itself. |
| Underlayment named on both? | Synthetic vs felt is a real cost and quality difference you'll never see from the driveway. |
| New flashing on both? | One bid replacing flashing and one reusing it are not the same job at different prices — they're different jobs. |
| Deck allowance per sheet on both? | A bid with no allowance isn't cheaper; it's just deferring that cost to a moment when you can't say no. |
| Permit, disposal, cleanup itemized? | Anything not listed is either coming later as an extra or not happening. |
| Workmanship warranty in writing? | A price with no installer standing behind it is worth exactly the paper. |
Allowance vs lump sum: know which you're holding
An allowance prices the unknowns in advance: decking at $X per sheet, approved as found. A lump sum wraps everything into one number. Lump sums aren't automatically dishonest — but a lump sum with no stated assumptions means you don't know whether rot, flashing, or ventilation is included, and neither interpretation favors you. If a contractor won't break the number down when asked, that's your answer about how change orders will go.
Why the lowest bid often costs the most
Here's the uncomfortable economics: labor and shingles cost roughly the same for everyone. When one bid comes in dramatically under the others, the difference almost always lives in the invisible layers — felt instead of synthetic, reused flashing, no membrane, no permit, uninsured labor, no warranty behind the work. In our climate, with 130 rainy days a year working on every shortcut, those savings surface as leaks in years two through five. Then you pay for the repair, and sometimes for parts of the roof to be done again properly. The cheap bid plus the fix costs more than the honest bid — we see the receipts on this regularly.
Red flags, collected
One lump-sum line for the whole job · no CCB number on the paperwork · "standard underlayment" · the word "reuse" near flashing · no deck allowance · no permit line · big deposit demanded up front · a price that expires today. Any one is a question; three or more is an exit.
For what the totals actually run around here, our local cost guide has honest ranges. And when you're ready, a free written estimate from us comes itemized exactly the way this guide describes — that's not a coincidence. If you'd rather never be surprised by your roof at all, the Home Care Membership keeps eyes on it every year from $49/month, no contracts.
Quick answers
What should a roofing estimate include?
Itemized everything: tear-off and disposal, a per-sheet deck repair allowance, the named underlayment product, ice-and-water membrane locations, new flashing, ventilation, shingle brand and line, permit, and cleanup with a magnetic sweep. A one-line lump sum can't be compared to anything — usually the point.
What is a deck repair allowance?
A pre-agreed price per sheet of plywood for replacing rotten decking found during tear-off, often with a few sheets included. You approve extras with photos before work proceeds. No allowance means rot becomes a surprise charge mid-job.
Why does the lowest bid often cost more in the end?
The discount hides in layers you can't see: felt underlayment, reused flashing, skipped membrane, no permit, no warranty. In our wet climate those shortcuts become leaks within a few years, and the repair bill erases the savings and then some.
Should the estimate include the permit?
Yes. Douglas County reroofs over 100 square feet generally require one, and a professional lists it as a line item they handle. No permit line means the price grows later or nobody's pulling one — which resurfaces when you sell.