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Roofing Replacement Cost Calculator

Estimate your new roof cost based on area, pitch, and materials

Flat / Low Slope (2:12) Standard (4:12 – 6:12) Steep (7:12 – 9:12) Very Steep (12:12+)

Asphalt Shingles (Basic) Architectural Shingles Metal Roofing (Standing Seam) Slate or Tile Wood Shakes

1 Story / Simple 2 Stories / Moderate 3+ Stories / Complex

Estimated Cost: $0.00

Total Roof Area: 0 sq ft (including pitch & 10% waste)

Estimated Material Cost: $0.00

Estimated Labor Cost: $0.00

*Note: This is a rough estimate. Local labor rates, permit fees, and specific tear-off costs may vary.

Comprehensive Guide to Roofing Replacement Costs

Replacing a roof is one of the most significant investments a homeowner will make. Understanding the factors that drive these costs is essential for budgeting and comparing contractor quotes. Our calculator provides a detailed breakdown based on several critical variables.

Key Factors Influencing Your Estimate

• Roof Square Footage: This is the most obvious factor. However, the "roofing square" (a 10×10 foot area) is the standard unit of measurement in the industry.
• Pitch (Slope): A steeper roof has more surface area than a flat one with the same footprint. Steep roofs also require specialized safety equipment and more labor time, increasing the overall price.
• Material Choice:
  • Asphalt Shingles: The most affordable and common option, lasting 15-30 years.
  • Metal: Highly durable and energy-efficient, lasting 50+ years.
  • Slate/Tile: Premium materials that offer unmatched aesthetics and longevity but require reinforced roof structures.
• Waste Factor: No roof is a perfect rectangle. Valleys, hips, and ridges require cutting shingles, leading to roughly 10-15% material waste.

Example Calculation

Imagine a 2,000 sq ft home (ground footprint) with a standard 6:12 pitch using architectural shingles:

Component	Calculation
Actual Surface Area	2,000 sq ft × 1.15 (Pitch) = 2,300 sq ft
With Waste (10%)	2,300 × 1.10 = 2,530 sq ft
Total Cost ($6.50/sq ft)	$16,445.00

Frequently Asked Questions

Does this include the cost of removing the old roof?
Typically, labor costs for "tear-off" range from $1.00 to $2.00 per square foot. This calculator factors in a baseline labor cost that includes standard disposal and installation.

How long does a roof replacement take?
Most residential roofs can be replaced in 1 to 3 days, depending on the size and complexity of the structure.

function calculateRoofCost() { var groundSqFt = parseFloat(document.getElementById("sqFootage").value); var pitchMultiplier = parseFloat(document.getElementById("roofPitch").value); var materialRate = parseFloat(document.getElementById("materialType").value); var complexityMultiplier = parseFloat(document.getElementById("complexity").value); if (isNaN(groundSqFt) || groundSqFt <= 0) { alert("Please enter a valid square footage."); return; } // Calculation Logic var wasteFactor = 1.10; // 10% waste standard var actualSurfaceArea = groundSqFt * pitchMultiplier; var totalAreaWithWaste = actualSurfaceArea * wasteFactor; // Labor estimation (Base labor $3.00/sqft adjusted by complexity) var baseLaborRate = 3.50; var adjustedLaborRate = baseLaborRate * complexityMultiplier; var materialTotal = totalAreaWithWaste * materialRate; var laborTotal = totalAreaWithWaste * adjustedLaborRate; var grandTotal = materialTotal + laborTotal; // Update DOM document.getElementById("totalPrice").innerText = "$" + grandTotal.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2}); document.getElementById("actualArea").innerText = Math.round(totalAreaWithWaste).toLocaleString(); document.getElementById("matCostDisplay").innerText = "$" + materialTotal.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2}); document.getElementById("laborCostDisplay").innerText = "$" + laborTotal.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2}); document.getElementById("roofResult").style.display = "block"; }