How the estimate works
- Roof area: if you enter the house footprint, the calculator adds the overhang and multiplies by the pitch factor to get the sloped roof surface. If you know the roof area (from a past quote or an aerial measurement report), enter it directly.
- Squares: roofing is priced per square (100 sq ft of roof), after adding waste for cuts at hips, valleys and edges.
- Price per square: the material's 2026 installed range, multiplied by a complexity factor.
- Your quote: enter a contractor's price per square to replace the default range.
Cost = Roof area × (1 + waste) ÷ 100 × Price per square × Complexity
Worked example
A 2,000 sq ft single-story footprint with 12 in overhangs and a 6/12 pitch has roughly 2,450 sq ft of roof. With 10% waste that is about 27 squares. At $550–$850 per square for architectural shingles, a simple roof comes to roughly $14,800–$22,900, with a mid-point near $18,800. Two-story homes have a smaller roof for the same floor area, because the footprint is half the size.
2026 roof prices by material
Typical installed price per square (100 sq ft of roof), including tear-off of one layer, underlayment and labor. These are national planning ranges compiled from 2026 cost guides; your local market can be 30–50% higher or lower.
| Material | Per square installed | Per sq ft | Typical lifespan |
|---|---|---|---|
| 3-tab asphalt shingles | $450–$650 | $4.50–$6.50 | 15–20 years |
| Architectural asphalt shingles | $550–$850 | $5.50–$8.50 | 25–30 years |
| Premium / designer asphalt | $700–$1,000 | $7.00–$10.00 | 30+ years |
| Metal panels (exposed fastener) | $650–$1,100 | $6.50–$11.00 | 30–45 years |
| Standing seam metal | $1,000–$1,800 | $10.00–$18.00 | 40–60 years |
| Concrete tile | $900–$1,800 | $9.00–$18.00 | 40–50 years |
| Clay tile | $1,200–$2,500 | $12.00–$25.00 | 50+ years |
| Cedar shake | $1,000–$1,800 | $10.00–$18.00 | 25–35 years |
| Natural slate | $1,500–$3,500 | $15.00–$35.00 | 75–100+ years |
From house size to roof size
Roof area is bigger than the footprint because of the overhangs and the slope. A 4/12 roof is about 5% larger than its footprint, a 6/12 roof about 12% larger, an 8/12 roof about 20% larger, and a 12/12 roof about 41% larger. Use the roofing calculator for a detailed material takeoff (bundles, underlayment, starter and ridge cap), and see roof pitch explained to measure your pitch.
What drives the price
- Material — the biggest factor; metal, tile and slate cost two to four times as much as asphalt.
- Complexity and pitch — valleys, dormers, skylights and chimneys add flashing and labor. Steep roofs (above about 8/12) need extra safety setup; contractors may charge up to 50% more for steep, complex roofs.
- Tear-off — removing more than one old layer, or replacing rotten decking, adds cost. Decking is often priced per sheet once the old roof is off.
- Location — labor rates, permit fees, disposal costs and local code requirements (ice barrier, wind ratings) vary widely.
- Structure — heavy tile and slate may need an engineer to confirm the framing can carry the weight.
Getting good quotes
- Get at least three written quotes that list the same scope: tear-off, decking allowance, underlayment, ice barrier, flashing, ventilation and cleanup.
- Check the roofer's license (where required), insurance and the manufacturer warranty level they can offer.
- Ask how replacement decking is priced, so a surprise doesn't double the bill.
- For insurance claims, document the damage with photos before work starts.
Frequently asked questions
How much does it cost to replace a roof in 2026?
Most architectural asphalt shingle roofs cost about $550–$850 per square installed. A typical single-story 2,000 sq ft home works out to roughly $15,000–$23,000, depending on pitch, complexity and location; a two-story home with the same floor area has a smaller roof and costs less.
How is roof replacement priced?
Roofers price by the square — 100 sq ft of roof surface — including tear-off, materials and labor, plus extras such as replacement decking, permits and disposal.
How do I estimate my roof area from my house size?
Take the footprint including overhangs and multiply by the pitch factor: about 1.05 for 4/12, 1.12 for 6/12 and 1.20 for 8/12. Add 10–15% waste.
Is a metal roof worth the extra cost?
Metal typically costs about 1.5–3 times as much as asphalt but can last two or more times as long. Whether it pays off depends on how long you plan to stay and your climate.
Why are my quotes higher than this estimate?
Steep or complex roofs, multiple layers to remove, rotten decking, high local labor rates and premium underlayment or warranties all push prices up. Use your quote per square in the calculator to compare.
Sources & standards
This calculator's formulas and default values are based on the following codes, standards and published data. Codes are adopted and amended locally, so check with your building department for permitted work. See how we build and check our calculators.
- Roofing cost guides published for 2026, including roofobservations.com and aggregated HomeGuide, This Old House and Angi pricing (installed price per square by material).
- International Residential Code (IRC) Chapter 9: roof assemblies, underlayment and ice barrier requirements.
- Pitch factor = √(1 + (rise ÷ 12)²); one roofing square = 100 sq ft.