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Roof Replacement Calculator

Plan a complete 2026 roof replacement: tear-off, decking allowance, code upgrades, dumpster size, crew duration, and full installed cost — itemized by line.

Roof Replacement Calculator

Plan the full replacement project: tear-off, disposal, decking allowance, code upgrades, crew duration, and total installed cost — all matched to your locale's currency and labour rates.

Estimated total replacement cost
$22,027
$11/sq ft · 22.4 squares · Architectural asphalt shingle
Annualised over 30-year service life: $734/yr · Project duration: 1 day(s) on a 4-person crew
Material
$4,137
Labour
$8,415
Tear-off
$3,242
Disposal
$1,677
Underlay
$1,453
Deck repair
$805
Code upgrades
$1,656
Permit + misc
$642
Surface area
2,236 sq ft
slope factor 1.118
Crew time
2.9 man-days
1 day(s) wall-clock
Debris
5,590 lbs
~10 cu yd skip

What this calculator does

This is a full project planner for replacing a sloped roof. It models the seven cost lines that together make up a real replacement:

  • Material — bundles, ridge cap, starter strip, hip-and-ridge accessories, fasteners
  • Labor — adjusted for pitch, complexity, and the difficulty of working with the chosen material
  • Tear-off — single, double, or triple existing layers
  • Disposal — landfill tipping fees varying by region and material weight
  • Underlayment — synthetic underlay or felt across the entire deck
  • Decking repair — a percentage of surface area for OSB or plywood replacement
  • Code upgrades — ice-and-water shield, ventilation, drip edge

It also estimates crew duration and debris weight / dumpster size so you can plan dumpster rental, schedule the days you need to be off the property, and stress-test the contractor’s quote.

How to use it

  1. Roof footprint — enter the plan-view (top-down) area in square feet. The calculator multiplies by the slope factor to get the actual roof surface area.
  2. Pitch — enter as X/12 or degrees. A 6/12 pitch is the U.S. average; anything above 8/12 starts adding labor.
  3. New material vs existing material — the new material drives material cost and life expectancy; the existing material drives debris weight and disposal cost.
  4. Layers to remove — single-layer is normal; double-layer adds $0.40 per sq ft to tear-off and doubles disposal weight.
  5. Region — adjust for your local labor market (see ranges below).
  6. Decking allowance — 5–10% on newer roofs, 15–25% on roofs older than 30 years.
  7. Code upgrades — toggle on if your jurisdiction requires the 2026 IRC items (most do).

Typical 2026 replacement cost ranges

A typical 2,000 sq ft single-family home roof replacement in mid-cost regions:

Material$/sq ft installedTotal costCrew time
3-tab asphalt$4.00–$5.50$8,000–$11,0001–1.5 days
Architectural asphalt$6.50–$10$13,500–$24,5001.5–2 days
Premium / luxury asphalt$10–$14$20,000–$28,0002–3 days
Standing-seam metal$16–$26$32,000–$52,0003–4 days
Corrugated steel$8.50–$12$17,000–$24,0002 days
Concrete tile$11–$18$22,000–$36,0003–4 days
Clay tile$16–$26$32,000–$52,0004–5 days
Natural slate$25–$48$50,000–$95,0005–10 days

Sources: 2026 NRCA Annual Market Survey; GAF, Owens Corning, CertainTeed regional pricing; HomeAdvisor 2026 cost guides; Angi state-level Q1 2026 data.

Regional cost variation in the U.S.

Labor is 50–60% of total cost on asphalt shingle jobs and the biggest driver of regional variance:

  • High cost (+25–35% above national): New York metro, San Francisco Bay Area, Boston, Honolulu, Seattle, Washington DC
  • Above average (+12–22%): Los Angeles, Chicago, Miami, Denver, Portland, Minneapolis
  • National average: Most of the South, Midwest, and Mountain West metros
  • Below average (–12 to –18%): Rural Texas, Mississippi, Alabama, Oklahoma, Arkansas

Code upgrades you cannot skip

The 2026 IRC mandates several items that frequently get omitted from low-ball quotes:

  • Ice-and-water shield — IRC R905.1.2 requires it from the eave at least 24 inches inside the warm-wall line in zones 4–8 (most of the country except the Deep South). Adds about $0.45 per sq ft.
  • Drip edge — IRC R905.2.8.5 requires it at all eaves and rakes. About $1.85 per linear foot.
  • Underlayment — synthetic over the full deck. About $0.65 per sq ft.
  • Ventilation — net free vent area equal to 1/300 of attic floor (ridge + soffit balanced). $0.18–$0.32 per sq ft if upgrading.

Together these items add roughly $1,000–$2,500 to a typical 2,000 sq ft replacement. Always ask your contractor to itemize them.

Common gotchas that blow the budget

Decking surprises. Once tear-off exposes the deck, soft, rotted, or warped sheets must be replaced. Plan a 5–10% contingency for newer roofs, more for older ones.

Skylight replacement. A skylight has the same age as the roof. Velux fixed skylights cost $450–$900 to replace including flashing kit. Don’t reuse old units.

Chimney flashing. Old metal flashings should be replaced at every re-roof. Lead flashing repair runs $350–$700; cricket installation behind a wide chimney runs $400–$1,200.

Solar panel removal. $2,500–$5,500 for removal and reinstallation. If you’re planning solar, re-roof first.

Gutter replacement. Old gutters often can’t be lifted off and reattached. Plan $7–$14 per linear foot for new aluminum, $18–$28 per linear foot for copper.

Repair vs replace decision

Repair if: the roof is under 60% of expected life, damage is localized, the field is in good condition, and there are no leaks beyond the damaged area.

Replace if: the roof is past 75% of expected life, more than 15% of the field shows curling or granule loss, you have multiple non-adjacent leaks, or you’re planning to add solar panels in the next 5 years.

Sources: 2026 NRCA Annual Market Survey; 2026 International Residential Code Chapter 9 (R903–R908); GAF, Owens Corning, CertainTeed manufacturer pricing; HomeAdvisor and Angi 2026 cost data; ASTM D3462 (asphalt shingles).

Frequently asked questions

How much does a full roof replacement cost in 2026?
The 2026 U.S. average for replacing a 2,000 sq ft roof is $13,500 to $24,500 with architectural asphalt shingles installed in mid-cost regions. The same project runs $32,000 to $52,000 with standing-seam metal, and $50,000 to $95,000 with natural slate. Single-story ranches replace cheaper than two-story homes; complex roofs with multiple valleys, dormers, and chimneys add 12–28% in labor. Source: 2026 NRCA Annual Market Survey, GAF and Owens Corning regional contractor pricing, HomeAdvisor 2026 cost data.
How long does a roof replacement take?
A simple 2,000 sq ft asphalt shingle replacement takes a four-person crew 1.5 to 2 working days from tear-off to clean-up. Tile and slate take twice as long. Metal standing-seam takes 2.5 to 4 days because every panel is custom-fabricated. Steep pitches (above 8/12) double the time. Weather, decking surprises, and skylight or chimney work commonly add a half day each. The calculator above estimates wall-clock days based on your crew size, pitch, and complexity.
Should I tear off the old roof or just go over it?
Always tear off when budget allows. The 2026 IRC R908.3 limits roof recovers to one additional layer over a single existing layer of asphalt shingles, and only if the deck is structurally sound. Recovering hides decking rot, traps heat, voids most manufacturer warranties, and adds 30–50 lb per square of dead load. Tear-off costs $1.45–$2.35 per sq ft but pays for itself when you find soft decking, prior leaks, or missing ice-and-water shield.
What decking replacement allowance should I budget?
Plan 5–10% on roofs under 25 years old, 12–18% on roofs 25–40 years old, and 20–30% on roofs over 40 years old or with prior leak history. Budget more if the deck is 1×6 plank decking instead of plywood — those roofs often need full re-decking ($1.85–$2.50 per sq ft additional). The calculator above includes a deck-allowance percentage so you can stress-test your number.
What size dumpster do I need for a roof tear-off?
Asphalt shingle debris weighs about 2.5–3 lb per sq ft per layer; tile and slate weigh 9–10 lb per sq ft. For a 2,000 sq ft single-layer asphalt tear-off you'll fill a 15–20 cubic yard roll-off (around 6,000 lb). A double-layer or tile tear-off needs a 30 cubic yard container. Most landfills weigh you in and charge $55–$95 per ton for shingle debris, or $75–$130 per ton for tile.
Are code-required upgrades included in the contractor's quote?
Often not. Always ask the contractor to itemize the 2026 IRC items: ice-and-water shield (zones 4–8 require it from the eave 24 inches inside the warm wall), ridge-and-soffit ventilation to 1/300 of attic floor, drip edge along eaves and rakes, and synthetic underlayment over the entire deck. These add $1,000–$2,500 on a typical job. The calculator's 'Include code upgrades' toggle estimates this line.
Can homeowners insurance pay for replacement?
Insurance pays only for sudden-peril damage — hail, windstorm, fallen tree, fire. Age-related wear, granule loss from sun exposure, and gradual leaks are not covered. After hail or wind events, file the claim before scheduling roofers. Most insurers now use Actual Cash Value depreciation on roofs over 15 years old; Replacement Cost Value coverage pays the full replacement minus your deductible. Document the damage with date-stamped photos and a roofer's written assessment before the adjuster visits.
What questions should I ask the roofer?
Verify state license number, general liability ($1M+) and workers' compensation insurance, manufacturer certification (GAF Master Elite, Owens Corning Platinum, CertainTeed SELECT ShingleMaster), and ask whether they self-perform or use subcontracted crews. Get the warranty in writing — both the manufacturer's material warranty and the installer's workmanship warranty. Avoid 'storm chasers' and contractors who knock door-to-door after a hail event.

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