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. Each one has a typical 2026 cost range and a specific role on the finished roof. The 4 red flags that signal a storm chaser or low-quality contractor: no itemization, no manufacturer (see our big three shingle brands guide) specification, “we’ll handle decking as needed” without a per-sheet rate, and a price materially below the regional median. The walkthrough below decodes each line, shows what’s negotiable and what isn’t, and gives you the exact questions to ask before you sign.
The short version
- A real estimate has 12 line items, not a single number. If it’s a single number, ask for itemization.
- Required lines: tear-off, decking allowance, drip edge, underlayment, ice and water shield, starter strip, shingles, hip and ridge cap, step flashing, counter flashing, ventilation, pipe boots.
- Red flags: no itemization, no manufacturer spec, vague decking allowance, price way below regional median, storm-chaser door knock pattern.
- Negotiable: brand selection, upgrade tiers, payment terms, project timing. NOT negotiable: code-required items, manufacturer-spec items, decking replacement.
- For the formula behind the estimate, see our roofing cost calculator method guide.
- For the homeowner-facing summary, see our roof cost estimator guide.
What a complete new roof estimate should look like
A complete estimate (see our free roofing estimates: real vs. bait guide) is a written document with line items, quantities, unit prices, and total. It’s not a one-page sales sheet with a single headline number. It’s not a verbal handshake. It’s also not a “good faith estimate, final pricing TBD” template. A real estimate locks in scope and pricing before you sign, with a clear change-order clause for decking and flashing surprises that come up during tear-off.
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 our the full 2026 Roofing Cost Report).
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 ($50 to $100 installed) 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 specify the decking material. 7/16 OSB and 1/2 plywood are most common. Older homes may have 1×6 plank decking; replacing plank with sheet decking is a code-driven change order. 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 in most 2026 building codes. 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 in freeze climates (IRC R905.1.2). 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. The cheap-bid version says “reuse existing flashing where possible.” Reused flashing is a 5-year leak waiting to happen because the existing flashing was bent and bonded to the old shingles. New step flashing is non-negotiable on a quality reroof.
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. Many contractors skip counter-flashing replacement and just reseal the existing flashing. Reseal is fine for the first 5 years; counter flashing replacement is required for 25-to-30-year reroof life. Chimney counter flashing in particular is the single most common leak source 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 required by IRC R806 and the manufacturer warranty. 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 1:300 rule (1 sq ft of vent area per 300 sq ft of attic) is the standard.
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 the second most common leak source on reroofs (after reused counter flashing). The rubber gasket cracks in the sun and the seal fails in 3 to 7 years. The boot itself is $15 retail; the labor to install (see our shingle roofing services guide) at reroof time is included in the crew’s day. There’s no good reason to reuse them.
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: per-sheet rate ($75 installed), 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 $24,000, $26,000, and $35,000 and a fourth at $17,000, the $17,000 quote is the red flag, not the $35,000. Material and labor costs are real. A 30% discount below the regional median almost always means either missing scope items, sub-standard installation, or change-order surprise. Storm-chasing companies are the typical source. They knock on doors after a hailstorm, quote 30% to 40% below market, and either disappear after the deposit or hit you with $8,000 in change orders mid-project.
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: late fall and winter installs in mild climates run 10% to 20% cheaper.
- 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 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: required by IRC R806 and by manufacturer warranty. Don’t try to skip.
- Permit and inspection: required in 95%+ of U.S. jurisdictions for reroofs.
Real estimate example for a 2,400 sq ft home
Below is what a real 2026 estimate looks like for 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 (GAF Timberline HDZ, Charcoal) | 27 sq | $650 | $17,550 |
| 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 | $29,069 |
Note that field shingles at $650 per square in this example is on the higher side, which is intentional to show what a quality quote looks like. The all-in $29,069 number tracks our roofing cost calculator method guide output within 5% for the same scope. If three quotes come back in the $26,000 to $32,000 range, that’s the right window. If one comes back at $19,000, expect 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%. Actual replacement on an older home is often 15% to 25%. The per-sheet rate in the contract ($50 to $100 installed) governs the change order. Confirm the rate before signing. Reasonable rate: $75 to $90 per sheet on average homes. Padded rate: $150+ per sheet. If the contractor’s per-sheet rate is materially above $100 in 2026, question why.
Flashing change orders
Chimney counter flashing usually comes out worse than expected once the old shingles are off. Step flashing at wall-to-roof junctions sometimes reveals rotten sheathing or framing. Expect 1 to 2 flashing-related change orders on most older homes, typically $300 to $1,500 each.
Structural change orders
Rare but expensive. Rotten rafters or trusses discovered after tear-off can add $2,000 to $8,000 to the project. The contractor should call you immediately when this is discovered, present the scope, 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 major hail and wind events with door-to-door sales teams. Their estimates follow a recognizable pattern: a free roof inspection with a “we found damage” outcome, a one-page estimate (no itemization), a price 25% to 40% 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 been in your area for 5+ years, have local license verification, have local references you can call, and provide a complete 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 (the industry-standard estimating software (for the full data set, see our the 2026 Roofing CRM Software Showdown)). 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 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 both: the Xactimate scope from the carrier and the contractor’s matched-line itemized estimate. Compare them. Get supplement explanations in writing. 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)
Don’t release the final payment until every item on this list is verified. Holding back the final payment is what gets the loose ends tied up.
Frequently asked questions
How many line items should a new roof estimate have?
12 distinct lines: tear-off, decking allowance, drip edge, underlayment, ice and water shield, starter strip, field shingles, hip and ridge cap, step flashing, counter flashing, ventilation, pipe boots and roof vents. Plus permit (see our roof permit cost guide) and tax. A single-line estimate is incomplete; a 12-line estimate is complete.
What’s the biggest red flag on a roofing estimate?
No itemization. A single “roof replacement: $24,500” number with no line items prevents you from comparing competing bids, verifying scope, or negotiating intelligently. Insist on a complete itemized estimate before signing.
How much below the regional median should I be suspicious of?
Anything more than 20% below the median of three competing quotes warrants serious questioning. Material and labor costs are real. A 30% to 40% discount almost always means missing scope, sub-standard installation, or change-order surprise. Storm chasers are the typical source.
Should the estimate specify the shingle brand and product?
Yes. “30-year architectural shingles” is vague; “GAF Timberline HDZ in Charcoal, Class A algae warranty, 6-nail pattern” is specific. Specificity protects you from substitution to cheaper products at install time.
What’s the standard decking allowance?
10% of roof area is the industry standard. For a 27-square roof, that’s about 9 sheets of 4×8 plywood or OSB. The per-sheet rate in 2026 should be $50 to $100 installed. Anything over $100 per sheet is padded.
Should ventilation be in the estimate?
Yes. Required by IRC R806 and by manufacturer warranty. If the existing ventilation is adequate, the estimate should state that with a calculation. If upgrades are needed (ridge vent, soffit vents, baffles), they should be itemized. See our attic ventilation guide.
What if the contractor refuses to itemize?
Walk away. A complete itemized estimate is the baseline professional standard. A contractor who refuses to itemize is either inexperienced, hiding margin, or planning to surprise you with change orders. The other two contractors you got quotes from are happy to itemize.
Should I negotiate the price?
Some lines are negotiable (brand, tier, color, timing, payment terms). Some are not (code-required items, manufacturer-spec items, decking). Negotiate the former. Don’t try to negotiate away the latter; you’ll just be installing a worse roof.
What questions should I ask before signing?
See our questions to ask roofing contractor guide for the full 25-question checklist. The critical ones: license number, insurance certificate, manufacturer certification status, workmanship warranty length, decking change-order rate, and 6-nail pattern confirmation.
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. 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.