How to Read a New Roof Estimate: 12 Line Items, 4 Red Flags, and What to Negotiate

By The Roofing Brief Team | Last reviewed: October 2026.

A complete new roof estimate in 2026 should have 12 distinct line items, not a single “roof replacement: $24,500” headline. The 12 lines are: tear-off and disposal, decking allowance, drip edge, underlayment, ice and water shield, starter strip, field shingles, hip and ridge cap, step flashing, counter flashing, ventilation (ridge vent + soffit), and pipe boots plus roof vents. The 4 red flags that signal a storm chaser or low-quality contractor: no itemization, no manufacturer specification, “we’ll handle decking as needed” without a per-sheet rate, and a price materially below the regional median. Brand tiers for line 7 are compared in the big three shingle brands guide.

What a complete new roof estimate should look like

A complete estimate is a written document with 12 line items, quantities, unit prices, and a total, plus a change-order clause for decking and flashing surprises found during tear-off; the sample below totals $19,619 for 27 squares. A one-page sales sheet with one headline number, a verbal quote, or a “good faith estimate, final pricing TBD” template locks in nothing. The free roofing estimates: real vs. bait guide shows how to tell them apart.

The format every reputable contractor uses includes the company name, license number, address, phone, the homeowner address, the roof area in squares, the material specification by manufacturer and product name, the 12 line items below with quantities and unit prices, a subtotal, taxes, total, payment terms, project timeline, and warranty disclosures. Anything less is a marketing document, not an estimate (for the full data set, see the full 2026 Roofing Cost Report). Our roofing estimate template lays out that format line by line.

Line item 1: Tear-off and disposal

Removing the existing roof down to the deck and hauling it to a landfill. Should be billed per square at $100 to $200 for single-layer asphalt, $150 to $300 for double-layer.

What to look for: the unit price ($/square), the quantity (matches your roof area), whether dumpster is included or separate, whether yard cleanup is included (it should be), whether magnetic nail sweep is included (it should be). A vague “tear-off and disposal: $4,000” without a per-square unit price is the most common omission. Ask for the unit price even if the total is reasonable.

For the full tear-off detail, see our tear-off roof cost guide.

Line item 2: Decking allowance

The contract allowance for replacing rotted or damaged plywood/OSB sheets during tear-off. Should be stated as a per-sheet rate (about $64 to $160 installed, from the $2 to $5 per square foot that HomeGuide reports for decking replacement) with an upfront allowance of X sheets (typically 10% of roof area = roughly 9 sheets on a 27-square roof).

What to look for: a clear per-sheet rate (so you know what change orders will cost), a stated upfront allowance (so you know what’s already in the headline price), and a clear policy for what happens when actual replacement exceeds the allowance (you pay the per-sheet rate for additional sheets). A quote that says “decking as needed, additional cost to be determined” is a blank check. A quote that says “decking included” with no per-sheet rate is going to surprise you when 25% of the deck is rotten.

The contractor should also name the decking material and thickness: 7/16-inch OSB and 1/2-inch plywood are the sheet panels most often quoted on reroofs, and the IRC sets minimum roof sheathing thickness by rafter spacing (Table R503.2.1.1(1)). Older homes may have 1×6 plank decking; replacing plank with sheet decking is a change order the contract should price per sheet. See our roof deck repair cost guide for the substrate detail.

Line item 3: Drip edge

Aluminum or galvanized steel L-shaped metal that runs along the eaves and rakes. Required at eaves and rakes of asphalt shingle roofs by IRC R905.2.8.5 (IRC 2021 Chapter 9), subject to local amendments. Should be billed per linear foot at $2 to $4 installed.

What to look for: full perimeter installation (both eaves and rakes), color specified to match the shingle or trim, gauge specified (29 gauge minimum). A common cheap-bid omission is rake drip edge (the up-slope edges of a gable). It’s required by code in most jurisdictions but contractors skip it on cost-cutting bids. See our drip edge guide for the install detail.

Line item 4: Underlayment

The waterproof or water-resistant layer between the deck and the shingles. Synthetic underlayment is the 2026 standard; 15-pound felt is legal but inferior. Should be billed per square at $15 to $30 for synthetic.

What to look for: the product name (GAF Tiger Paw, Owens Corning Deck Defense, CertainTeed Roofers’ Select, Tamko TW Metal & Tile, etc.). “Synthetic underlayment” with no brand is acceptable; “underlayment” with no qualifier could mean cheap 15-pound felt. Felt has its place but it tears in wind, absorbs moisture, and doesn’t last 30 years. If the estimate specifies felt and you want synthetic, ask for the upgrade. The cost delta is $200 to $600 on a typical reroof. See our felt vs synthetic underlayment guide.

Line item 5: Ice and water shield

Self-adhering rubberized membrane installed at eaves, valleys, and around penetrations. Code-required where there is a history of ice forming along the eaves (IRC R905.1.2, IRC 2021 Chapter 9). Should be billed per square at $20 to $50 for the typical eave + valley coverage.

What to look for: clear coverage spec (typically 36 inches up the slope from the eave, full coverage in valleys, 6 inches around penetrations). Products: GAF WeatherWatch, OC WeatherLock, CT WinterGuard, Grace Ice & Water Shield. A quote that omits ice and water shield in a freeze climate is a major red flag, both because it’s code-required and because it’s the single biggest defense against ice dam damage.

Line item 6: Starter strip

Manufacturer-made starter shingles installed at eaves and rakes. Not field shingles cut down. Required to qualify for most manufacturer wind warranties. Should be allocated $50 to $150 per square within the field shingle line, or itemized separately.

What to look for: explicit reference to “manufacturer starter strip” or the specific product name (GAF Pro-Start, OC Starter Strip Plus, CT SwiftStart, etc.). “Starter shingles” without qualifier may mean cut-down field shingles, which voids most wind warranties. Ask explicitly: is the starter strip a manufacturer-made product or are field shingles being used? Answer should be the former.

Line item 7: Field shingles

The shingles that cover the main roof area. The headline material line. Should be billed per bundle at $55 to $80 (architectural mid-tier) or per square at $165 to $240, depending on contractor convention.

What to look for: the manufacturer (GAF, Owens Corning, CertainTeed, IKO, Atlas, Tamko, Malarkey), the product name (Timberline HDZ, Duration, Landmark, Cambridge, Pinnacle Pristine, Heritage, Legacy), the color, the algae warranty (Class A or AR), the wind rating, and the nail pattern (must be 6-nail for wind warranty on architectural shingles).

A common quote omission is the nail pattern. “6-nail pattern at manufacturer-specified locations” should be explicit in the spec. If the contract just says “nail per manufacturer specs,” that often means 4-nail in practice (cheaper, faster, but voids high-wind warranties). For brand specifics, see our reviews of GAF Timberline HDZ, CertainTeed Landmark, and Atlas Pinnacle Pristine.

Line item 8: Hip and ridge cap

Specialty shingles for the hips and ridges of the roof, installed last. Should be manufacturer ridge cap, not field shingles cut into thirds. Allocated $50 to $150 per square or itemized separately.

What to look for: the product name (GAF TimberTex, OC Ridgemaster, CT Mountain Ridge, etc.). “Hip and ridge: included” without product spec is often field shingles cut down. Cut field shingles look worse, fail the manufacturer warranty, and weather faster. Ask explicitly for manufacturer hip and ridge.

Line item 9: Step flashing

Individual L-shaped metal pieces installed at every roof-to-wall junction (where the roof slope meets a vertical wall). Replaced at every reroof, not reused. Allocated $10 to $25 per square or itemized.

What to look for: explicit “new step flashing at all roof-to-wall junctions” or similar language. IRC R905.2.8.3 requires sidewall flashing to be continuous or step flashing. The cheap-bid version says “reuse existing flashing where possible.” Reused flashing is a common leak path because it was bent and bonded to the old shingles. Ask for new step flashing at every roof-to-wall junction in writing.

Line item 10: Counter flashing

The metal flashing at chimney sides, dormer walls, and any roof-to-vertical-surface junction that needs both step flashing (bottom) and counter flashing (top, set into the wall). Allocated $15 to $40 per square, or $200 to $800 per chimney.

What to look for: explicit counter-flashing line at chimney, dormers, and walls, in corrosion-resistant metal (IRC R905.2.8.1 covers base and cap flashing; confirm the thickness with your building department). Many contractors skip counter-flashing replacement and just reseal the existing flashing. Resealing old counter flashing may hold for a few seasons; replacement is what matches the life of a new shingle roof. Chimney counter flashing is a frequent leak point on otherwise sound roofs.

Line item 11: Ventilation (ridge vent + soffit)

The ridge vent runs along the entire ridge. Soffit vents along the eaves provide intake. Together they create the balanced ventilation addressed by IRC R806 (IRC 2021 Chapter 8) and most shingle makers’ warranty terms. Allocated $25 to $90 per square depending on whether soffit upgrade is needed.

What to look for: ridge vent product (GAF Cobra, OC VentSure, CT Ridge Runner, etc.), soffit ventilation status (existing adequate, upgrade needed, baffles required). Many older homes have inadequate soffit ventilation that voids the new shingle warranty. The estimate should address ventilation explicitly. “Existing ventilation adequate” should be backed by a stated net-free-area calculation. The IRC starts at 1 sq ft of net free vent area per 150 sq ft of attic floor and allows 1:300 when a vapor retarder is on the warm side or the vent area is split between upper and lower openings (R806.2).

See our attic ventilation guide for the full calculation method and product detail.

Line item 12: Pipe boots and roof vents

Rubber or rigid-plastic boots that seal around plumbing vent stacks and HVAC penetrations. Plus any roof-mounted bath fan vents or kitchen exhausts. Allocated $25 to $80 each, $100 to $400 total on most homes.

What to look for: new pipe boots at every plumbing penetration (NOT reused). New roof vents where existing ones are damaged. Reused pipe boots are a common leak source on reroofs, because the rubber gasket can crack in the sun and the seal can fail years before the new shingles wear out. The boot itself is $15 retail; the labor to install at reroof time is included in the crew’s day. There is no good reason to reuse them; see shingle roofing services for the full reroof scope.

The four red flags on a new roof estimate

These signal either a storm chaser, an inexperienced contractor, or a margin-stripping low-bid that will turn into change-order avalanches once tear-off starts.

Red flag 1: no itemization

A single “roof replacement: $24,500” with no line items means you can’t compare apples to apples with competing bids, you can’t tell what’s included and what isn’t, and you have no negotiating room on change orders. The fix: ask for an itemized estimate with the 12 lines above. If they refuse, walk away.

Red flag 2: no manufacturer specification

“30-year architectural shingles” without a brand or product name means the contractor reserves the right to install whatever’s cheapest at the supply house that week. The fix: specify the brand, product name, and color in the contract. “GAF Timberline HDZ in Charcoal” is locked in; “30-year architectural” isn’t. This applies to underlayment, ice and water shield, ridge cap, and starter strip too.

Red flag 3: vague decking allowance

“Decking as needed at additional cost” is a blank check. “Decking included up to 5% of roof area, additional sheets at fair market price” is almost as bad. The fix: a stated per-sheet rate, upfront allowance (10% of roof area or 9 sheets on a 27-square roof), and a clear policy for what happens when actual exceeds allowance. See our red flags roofing contractor guide.

Red flag 4: price materially below regional median

If three quotes come in at $17,500, $19,000, and $26,000 and a fourth at $12,000, the $12,000 quote is the red flag, not the $26,000. Material and labor costs are real. A bid 30% below the regional median usually means missing scope items, sub-standard installation, or change-order surprise. Storm-chasing companies are a typical source: they knock on doors after a hailstorm, quote far below market, and either disappear after the deposit or add large change orders mid-project. Our roof replacement quote guide shows how to compare three bids line by line.

For the storm-chaser playbook in detail, see our roofing scams guide.

What’s negotiable on a roof estimate

Some lines move; some don’t. Understanding the difference is how you negotiate without compromising quality.

Negotiable

• Brand and tier: GAF vs Owens Corning vs CertainTeed on the same tier. Architectural vs premium dimensional vs designer. Each tier has price-and-lifespan tradeoffs.
• Color choice: no cost impact for most stocked colors.
• Project timing: off-season installs in mild climates can run cheaper; ask for the dated discount in writing.
• Payment terms: 50/50, 33/33/34, or 25/25/25/25 splits across deposit/start/midpoint/completion. Smaller deposits with progress payments is the homeowner-favorable structure.
• Cleanup level: standard cleanup is included; deep cleanup (magnetic sweep + leaf cleanup + final wash) is sometimes a $200 add.
• Warranty registration: contractor should register at no charge but sometimes it’s mentioned as an extra. Push back.

NOT negotiable (don’t try)

• 6-nail pattern: required for high-wind warranty. Don’t accept 4-nail.
• Manufacturer starter strip and ridge cap: required for full warranty. Don’t accept cut field shingles.
• Code-required ice and water shield in freeze zones: IRC R905.1.2 requirement. Don’t try to remove it.
• New flashing: step flashing and counter flashing at chimney, walls, dormers. Don’t accept reused flashing.
• New pipe boots: don’t accept reused boots.
• Balanced ventilation: addressed by IRC R806 and by most manufacturer warranties. Don’t try to skip.
• Permit and inspection: required by most jurisdictions for reroofs; confirm with your building department.

If the estimate says this, do this

If the estimate says	Then
One headline number, no lines	Ask for the 12 line items with quantities and unit prices before comparing it with other bids.
“Decking as needed”	Require a per-sheet rate (HomeGuide: about $64 to $160 per 4×8 sheet) and an upfront allowance (about 9 sheets on a 27-square roof).
“Reuse existing flashing”	Require new step flashing at every roof-to-wall junction and a counter-flashing line at chimneys and dormers.
“Underlayment” with no product named	Ask whether it is 15-pound felt or synthetic; the upgrade runs about $200 to $600 on a typical reroof.
“Nail per manufacturer specs”	Ask for the 6-nail pattern in writing; 4-nail installs can void high-wind warranties.
A bid more than 20% below the median of three quotes	Compare line by line for missing scope before signing.

Sample itemized estimate for a 2,400 sq ft home

Below is an illustrative 2026 itemized estimate that The Roofing Brief built from the line-item ranges above. It is not a real customer bid. It covers a 27-square architectural shingle reroof on a 6:12 simple-gable home in a mid-cost region.

Line	Item	Qty	Unit price	Total
1	Tear-off single layer + disposal	27 sq	$150	$4,050
2	Decking allowance (9 sheets @ $80 installed)	9 sht	$80	$720
3	Drip edge full perimeter (210 lf)	210 lf	$3	$630
4	Synthetic underlayment (GAF Tiger Paw)	27 sq	$22	$594
5	Ice and water shield (eaves + valleys)	10 sq	$80	$800
6	Manufacturer starter strip (GAF Pro-Start)	27 sq	$15	$405
7	Field shingles installed, material plus labor (GAF Timberline HDZ, Charcoal)	27 sq	$300	$8,100
8	Hip and ridge cap (GAF TimberTex)	27 sq	$45	$1,215
9	Step flashing (new, all roof-to-wall)	27 sq	$15	$405
10	Counter flashing (chimney + 2 dormers)	3 ea	$300	$900
11	Ridge vent (GAF Cobra, 40 lf) + soffit baffles	1 ea	$1,200	$1,200
12	Pipe boots (4) + roof vents (2)	6 ea	$50	$300
	Permit + inspection	1	$300	$300
	Subtotal			$19,619

The field-shingle line here includes installation labor, which is why it runs above the $165 to $240 per square material-only figure in the line-item guide. The all-in $19,619 works out to about $7.27 per square foot of roof (27 squares is 2,700 sq ft), inside the $5 to $8 per square foot architectural-asphalt range in The Roofing Brief 2026 Roofing Cost Report. It sits toward the top of that range because the scope includes full new flashing, ice and water shield, and ridge ventilation. On a 27-square roof, $5 to $8 per square foot means about $13,500 to $21,600. For the method behind these numbers, see our roofing cost calculator method guide. If one quote comes back well under $13,500 for the same scope, check it for missing line items.

The change-order conversation

Change orders are inevitable on most reroofs. The question is whether they’re priced fairly when they happen. Three change-order categories that come up regularly:

Decking change orders

The contract allowance is 10% of roof area, about 9 sheets on a 27-square roof. Older decks can need more, and the per-sheet rate in the contract governs every sheet past the allowance, so confirm it before signing. HomeGuide puts installed decking replacement at $2 to $5 per square foot, or about $64 to $160 per 4×8 sheet. If the contractor’s per-sheet rate is well above that range, ask why.

Flashing change orders

Old shingles hide bad chimney and wall flashing. Require a dated photo and a written price before any extra flashing work starts.

Structural change orders

Rotten rafters or trusses found after tear-off add structural carpentry. The contractor should call you immediately and price the change order before proceeding. Walk away from any contractor who proceeds with structural work without written change-order approval.

Storm chaser estimate patterns

Storm chasers are out-of-state companies that follow hail and wind events with door-to-door sales teams. The pattern: a free inspection with a “we found damage” result, a one-page estimate (no itemization), a price far below the regional median (often quoted as “what insurance will pay”), and pressure to sign immediately.

What they’re actually doing: harvesting the insurance payout for damaged-but-not-totaled roofs, signing as many homeowners as possible in a short window, then either subcontracting to local crews at a discount or installing themselves with imported labor. Quality is variable to poor. Warranties evaporate when the company leaves the state. The local Better Business Bureau will tell you nothing because the company isn’t registered locally.

The fix is straightforward: only sign with companies that have worked in your area for at least 5 years, show a license number you can verify with your state board, give references you can call, and hand over a 12-line itemized estimate. The how to choose a roofing contractor guide walks through the full vetting protocol.

Insurance claim estimates vs out-of-pocket estimates

Insurance claim work uses a slightly different estimate format. The carrier’s adjuster produces a scope sheet using Xactimate, Verisk’s estimating software. The contractor’s estimate should match the Xactimate scope line-for-line. Any item the contractor adds that’s not on the Xactimate scope is a supplement, which the contractor or homeowner submits to the carrier for approval.

The honest insurance-claim contractor walks through the Verisk Xactimate scope with you and identifies any line items the adjuster missed that need supplements (often overhead/profit, code upgrades, or items they couldn’t see during the inspection). The dishonest insurance-claim contractor inflates supplements to capture more carrier money or asks you to sign over your insurance check without ever showing you the Xactimate scope.

If your reroof is insurance-funded, ask for the carrier’s Xactimate scope and the contractor’s 12-line estimate, then compare them line by line. See our 30-point roof inspection checklist guide for what should be documented in the initial inspection.

Final-bill audit checklist

When the project is complete and the final invoice arrives, audit it against the original estimate:

• All 12 line items present in the original estimate also present in the final bill
• Decking change-order count itemized with per-sheet rate matching the contract
• Flashing change orders documented with photo evidence
• Warranty registration confirmed (contractor should provide registration number)
• Manufacturer warranty certificate provided
• Permit closed out with municipal inspection passed
• Final walk-through completed with sign-off sheet
• Magnetic nail sweep completed (yard and gutters)

Hold the final payment until the permit shows a passed final inspection and the manufacturer warranty registration number is in your hands.

Bottom line

A complete new roof estimate has 12 line items, not a single number. Tear-off, decking allowance, drip edge, underlayment, ice and water shield, starter strip, field shingles, hip and ridge cap, step flashing, counter flashing, ventilation, and pipe boots and vents. Each line has a clear unit price and quantity. The 4 red flags are no itemization, no manufacturer spec, vague decking allowance, and a price materially below the regional median. Walk away from any contractor who can’t provide a complete itemized estimate; the sample above totals $19,619 for 27 squares. For the formula behind the math, see our roofing cost calculator method guide. For the homeowner-facing planning version, see our roof cost estimator guide.