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Roofing Cost Calculator

Asphalt Shingles (Standard) Architectural Shingles (Premium) Metal Roofing Slate or Tile Wood Shakes

Flat or Low Slope (1/12 – 3/12) Moderate Pitch (4/12 – 8/12) Steep Pitch (9/12+) Very Complex / High Slopes

Yes, Remove 1 Layer ($1.50/sqft) Yes, Remove 2 Layers ($2.50/sqft) No, Install over existing

Estimated Project Cost

$0.00

Breakdown:

function calculateRoofCost() { var area = parseFloat(document.getElementById("roofArea").value); var materialPrice = parseFloat(document.getElementById("materialType").value); var pitchMultiplier = parseFloat(document.getElementById("roofPitch").value); var tearOffPrice = parseFloat(document.getElementById("tearOff").value); if (isNaN(area) || area <= 0) { alert("Please enter a valid roof area."); return; } // Calculations var baseMaterialCost = area * materialPrice; var complexityAdjustment = baseMaterialCost * (pitchMultiplier – 1); var tearOffTotal = area * tearOffPrice; // Average labor is roughly 60% of material cost for standard installs, // but we adjust based on pitch complexity var estimatedLabor = (area * 3.50) * pitchMultiplier; var grandTotal = baseMaterialCost + complexityAdjustment + tearOffTotal + estimatedLabor; // Display Results document.getElementById("resultArea").style.display = "block"; document.getElementById("totalCostDisplay").innerText = "$" + grandTotal.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2}); document.getElementById("materialCostDetail").innerText = "• Materials: $" + (baseMaterialCost + complexityAdjustment).toLocaleString(undefined, {maximumFractionDigits: 0}); document.getElementById("laborCostDetail").innerText = "• Estimated Labor: $" + estimatedLabor.toLocaleString(undefined, {maximumFractionDigits: 0}); document.getElementById("tearOffDetail").innerText = "• Disposal/Tear-off: $" + tearOffTotal.toLocaleString(undefined, {maximumFractionDigits: 0}); }

Replacing a roof is one of the most significant investments a homeowner will make. Understanding the variables that drive the final quote can help you budget effectively and avoid surprises during the renovation process.

Key Factors Influencing Your Estimate

While square footage is the primary driver of cost, several other technical factors play a critical role in the final price of a roofing project:

• Roof Square Footage: Professional roofers measure in "squares," where one square equals 100 square feet. This calculator uses total square footage for higher precision.
• Material Choice: Asphalt shingles are the most common and budget-friendly, while premium materials like metal or slate can triple the material cost but offer much longer lifespans (50+ years).
• Pitch and Slope: A steep roof (anything over a 6/12 pitch) requires specialized safety equipment and more labor hours because installers cannot walk on the surface as easily.
• Tear-off Layers: If you have multiple layers of old shingles, the labor and disposal fees increase significantly. Most building codes allow a maximum of two layers before a full tear-off is required.

Real-World Roofing Cost Examples

Scenario 1: Standard Ranch Home
2,000 sq. ft. roof, standard asphalt shingles, moderate pitch, 1 layer tear-off.
Estimated Cost: $11,500 – $13,500

Scenario 2: Large Two-Story Home
3,500 sq. ft. roof, architectural shingles, steep pitch, 1 layer tear-off.
Estimated Cost: $22,000 – $26,000

Scenario 3: Modern Metal Upgrade
2,000 sq. ft. roof, standing seam metal, moderate pitch, no tear-off (install over).
Estimated Cost: $28,000 – $32,000

Frequently Asked Questions (FAQ)

Q: How long does a roof replacement take?
A: Most residential roofs can be replaced in 1 to 3 days, depending on weather and complexity.

Q: Does my location affect the price?
A: Yes. Labor rates vary by region, and local disposal fees for old materials can change the "Tear-off" portion of your quote.

Q: Should I choose metal over shingles?
A: Metal has a higher upfront cost but often lasts 2-3 times longer than asphalt, potentially increasing your home's resale value and lowering long-term maintenance costs.

Note: This calculator provides a rough estimate for educational purposes. Always obtain at least three quotes from licensed and insured local contractors before starting your project.