No, overlay existing
Yes, remove one layer ($1.50/sf)
Yes, remove two layers ($2.50/sf)
Budget / Rural Area ($2.50/sf)
Average / Suburban ($3.50/sf)
Premium / Metro Area ($5.00/sf)
Total Roof Area (incl. waste factor):0 sq ft
Estimated Material Cost:$0
Estimated Labor & Tear-off:$0
Total Estimated Cost:$0
*Estimates include a 10% waste factor for materials. Final costs vary by contractor and location.
function calculateRoofCost() {
// Get input values using var
var footprint = parseFloat(document.getElementById("homeFootprint").value);
var pitchMultiplier = parseFloat(document.getElementById("roofPitch").value);
var materialPricePerSf = parseFloat(document.getElementById("roofMaterial").value);
var tearOffPricePerSf = parseFloat(document.getElementById("tearOff").value);
var laborPricePerSf = parseFloat(document.getElementById("laborCost").value);
// Validation
if (isNaN(footprint) || footprint <= 0) {
alert("Please enter a valid home square footage.");
return;
}
// Calculate actual roof area based on pitch
// Add 10% for eaves, overhangs, and waste
var wasteFactor = 1.10;
var actualRoofArea = footprint * pitchMultiplier * wasteFactor;
// Calculate Costs
// Material is based on actual roof area
var totalMaterialCost = actualRoofArea * materialPricePerSf;
// Labor is based on actual roof area
var totalLaborCost = actualRoofArea * laborPricePerSf;
// Tear off is usually charged on the actual roof area being removed
var totalTearOffCost = actualRoofArea * tearOffPricePerSf;
var finalLaborAndTearOff = totalLaborCost + totalTearOffCost;
var grandTotal = totalMaterialCost + finalLaborAndTearOff;
// Update DOM
document.getElementById("displayArea").innerHTML = Math.round(actualRoofArea).toLocaleString() + " sq ft";
document.getElementById("displayMaterial").innerHTML = "$" + Math.round(totalMaterialCost).toLocaleString();
document.getElementById("displayLabor").innerHTML = "$" + Math.round(finalLaborAndTearOff).toLocaleString();
document.getElementById("displayTotal").innerHTML = "$" + Math.round(grandTotal).toLocaleString();
// Show results
document.getElementById("resultsArea").style.display = "block";
}
Understanding Your Roof Replacement Estimate
Replacing a roof is a significant investment for any homeowner. This Roof Replacement Cost Estimator helps you budget effectively by accounting for the critical variables that contractors use when preparing a quote.
Key Factors Influencing Roofing Costs
Roof Pitch (Steepness): A steeper roof increases the surface area significantly compared to the ground floor footage. It also requires more safety equipment and slower labor, increasing costs by 15-60%.
Material Choice: Asphalt shingles are the most common and affordable option. Premium materials like Metal, Clay, or Slate can cost 3 to 5 times more but offer superior longevity (50+ years).
Tear-Off: If your home already has multiple layers of shingles, building codes often require removing them before installing a new roof. This adds labor and disposal fees.
Waste Factor: Professional roofers always calculate 10-15% extra material to account for cutting shingles to fit valleys, hips, and ridges.
Material Cost Guide (Per Square Foot)
While labor varies by region, material costs remain relatively consistent. Here is a quick breakdown:
Asphalt Shingles: $3.50 – $5.50 per sq. ft. (Duration: 15-30 years)
Metal Roofing: $9.00 – $14.00 per sq. ft. (Duration: 40-70 years)
Clay/Concrete Tile: $12.00 – $20.00 per sq. ft. (Duration: 50+ years)
Natural Slate: $18.00 – $30.00 per sq. ft. (Duration: 100+ years)
Use the calculator above to experiment with different materials and see how they impact your overall budget.