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Compare roofing quotes: a roof replacement scope checklist

Compare roof bids beyond the total: measured area, tear-off, flashing, decking repair prices, ventilation, cleanup and warranties. Work through a sample difference.

Reviewed 2026-10-14How we review Suggest a correction

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Give each roofer the same project description, then check the proposed measurement, materials and removal work. Ask for a unit price and approval process for hidden damage so an open allowance does not look like a fixed project price.

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1. Covering
2. Decking sheets
3. Supports

LOOK BELOW THE SHINGLESOne roof. Different parts of the quote.

Decking sits below the covering. Replacing the roof covering does not establish how much decking needs repair.

Parts are separated to show the difference. Simplified illustration; not an installation detail or damage assessment.

Put the scope side by side

What to resolve when roofing estimates describe different work
Compare	One estimate says	Another estimate says	What to confirm
Measurement and material	Replace shingles	Measured area and product named	What roof surface is covered, which product is specified, and does the quantity include waste? Do not use living area as roof area.
Removal	Tear-off included	Number of layers specified	How many existing layers are included, and what happens if another layer is found?
Flashing and ventilation	Reuse where possible	Replacement details listed	Which parts stay, which are replaced, and why is that approach suitable for this roof?
Hidden decking damage	Additional charge if needed	Per-sheet price and scope	What sheet material, thickness, labor and disposal does the unit price cover? How will the damage and approval be documented?
Protection and completion	Cleanup included	Protection, debris and handoff listed	Who handles permits if required, weather protection, landscaping protection, disposal and the final walkthrough?

ILLUSTRATIVE EXAMPLE · NOT MARKET PRICES

Separate a decking scenario from the agreed base price

Illustrative arithmetic only: A quotes $14,000 plus $110 per replacement decking sheet. B quotes $14,600 with four equivalent sheets included. Imagine inspection later confirms four sheets are needed. These figures are invented, not a forecast of damage or a local price.

A under that scenario: $14,000 + (4 × $110) = $14,440. B under that scenario: $14,600. Difference: $160.

Before inspection, A still has an unknown repair quantity. B may charge extra above its four-sheet allowance. Ask both roofers how quantities are measured and extra work is authorized; do not enter a guessed repair quantity as a confirmed charge.

GET COMPARABLE QUOTES

Ask roofers to price the same scope

Replace the bracketed details, then use the same request with each company you are considering. Keep their written answers beside the quote.

Read the request before copying

I am comparing replacement proposals for [roof sections or whole roof]. My concerns are [leaks, visible damage or not sure]. Preferred timing: [timing].
Please provide:
1. Measured roof area, ordering quantity and any waste included.
2. Named materials, layers included in removal, and flashing/ventilation items to replace or reuse.
3. Included decking repairs and additional unit prices with material, dimensions, labor and disposal defined.
4. How hidden damage is documented, approved and handled while the roof is exposed.
5. Permit responsibility, property protection, cleanup and completion documents.
6. Installed cash total, exclusions, payment schedule, warranty terms and quote expiration.
Please price optional upgrades separately and identify anything that cannot be confirmed until tear-off.
Please list flashing locations and their repair, replacement or reuse scope, with completion photos. If deck sealing is proposed, price the compatible assembly separately and identify any claimed certification requirements.

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Compare a possible decking repair allowance

Quote AQuote A total price ($)Use the cash project price before any financing charges.Quote A extras outside that total ($)Enter 0 only when no additional known charges apply. Include tax or fees here only if outside the quoted total.

Check what is included in quote A

Material, roof measurement and removal layers — AUnderlayment, flashing and ventilation — AWritten price for hidden decking repairs — APermits, property protection and cleanup — AProduct and workmanship warranty terms — A

Compare a payment plan for quote A

Quote BQuote B total price ($)Use the cash project price before any financing charges.Quote B extras outside that total ($)Enter 0 only when no additional known charges apply. Include tax or fees here only if outside the quoted total.

Check what is included in quote B

Material, roof measurement and removal layers — BUnderlayment, flashing and ventilation — BWritten price for hidden decking repairs — BPermits, property protection and cleanup — BProduct and workmanship warranty terms — B

Compare a payment plan for quote B

I have checked that all quotes cover comparable products, quantities and work.

Leave unchecked when equipment, materials, measurements or scope differ.

Questions to take to your provider

Please identify all material, flashing and ventilation work that will be reused or replaced.
How will you document and price damaged decking before I approve repairs?
What is excluded from this price, including permits, disposal, tax and property restoration?

Use these with the companies you are already considering. Ask for written answers so you can compare the same work or coverage.

Questions covered in this guide

What should every roof replacement quote describe?

Give each roofer the same roof sections and ask for a written scope covering removal, replacement materials, reused components and completion. Request the measured roof area and the ordering quantity as separate figures if they differ. The roof area guide explains surface, footprint and roofing squares. “Thirty squares” alone does not tell you whether the number includes a waste allowance or describes only part of the roof.

Which flashing details should appear in the quote?

The Building America Solution Center’s reroofing guidance calls for inspection of flashing around vents, chimneys and other roof openings, as well as roof-wall joints and valleys. Flashing directs water through these vulnerable transitions. Ask the roofer to identify each location, which parts will remain, which will be repaired or replaced, and how they will connect to the surrounding water-control layers. Request completion photos taken by the contractor before concealed details are covered. You do not need to climb onto the roof to collect that record.

What does research tell us about sealing a roof deck?

In IBHS’s preliminary wind-driven-rain study, Stephen Quarles and colleagues compared sealed and unsealed portions of a full-size duplex roof. With roof covering removed, more water entered through unsealed panel joints than through taped joints. This was a controlled damage scenario, not a prediction of savings or leak prevention for your home. Ask whether deck sealing is appropriate for your roof, what compatible assembly is proposed, and its separate installed price. A deck-sealing line item alone does not establish a FORTIFIED designation or an insurance discount.

How do you compare materials beyond the shingle name?

A matching shingle name does not settle the rest of the assembly. Ask each roofer to identify:

Existing layers included in tear-off and the charge if additional layers are discovered.
Underlayment and other specified protective layers.
Flashing at roof intersections, penetrations and edges, with reused items named.
Ventilation work and the reason for the proposed approach.
Disposal, property protection, cleanup and completion documents.

Request an explanation when recommendations differ. Keep product choices separate from a claim that every component is being replaced.

How should hidden decking damage be priced?

Ask for the included quantity and the price of additional work in an explicit unit. A sheet price needs the sheet dimensions, material, thickness, labor and disposal scope; a linear-foot repair cannot be compared as if it were a sheet. GAF’s decking guidance explains why condition may only become clear after tear-off. Ask how the roofer will document damage, obtain your approval and protect exposed areas while a decision is pending.

What changes if the repair quantity is higher or lower?

Use the same assumed quantity for both bids without calling it a prediction. In the example above, four sheets leave a $160 difference. If zero sheets are needed and B’s included allowance does not create a refund, A is $600 lower on those invented prices. If more than four sheets are needed, B’s additional-sheet rate is required before the comparison can be completed. An included allowance is not automatically a refundable credit; ask for the agreement’s terms.

Which promises belong in writing before work begins?

Ask who is responsible for any required permits, weather protection, property damage, cleanup and the final walkthrough. Request the actual product and workmanship warranty terms, including conditions and service responsibility. Put the process for changes and payments beside the base scope. Then use the roofing quote comparison to separate confirmed charges from a possible decking scenario. Leave an unknown rate or quantity unresolved until the roofer supplies it.

Putting it into practice

Separate measured roof surface from ordering quantity, and distinguish included repair units from additional units. A common decking scenario helps compare exposure but cannot convert an uninspected roof into a fixed-price job.

Sources and supported claims

The FTC recommends multiple written estimates, an explanation of large differences and comparing the described work rather than automatically choosing the lowest bidder.
Source ↗ · national · Checked 2026-10-12

GAF explains that decking replacement is not automatic with a new roof and that concealed condition can affect the quote after tear-off.
Source ↗ · national · Checked 2026-10-13

Building America guidance calls for inspection and appropriate repair or replacement of flashing during reroofing, including penetrations and roof transitions.
Source ↗ · national · Checked 2026-10-13

The IBHS preliminary duplex study found greater water entry through untaped than taped roof-deck joints after roof covering was removed; it is a controlled test.
Source ↗ · national · Checked 2026-10-13

More help with this decision

Sources & scope

Modernize: Asphalt shingle installation ranges ↗
National installed cost per square foot by shingle type · Checked 2026-10-12