#roofing-calculator-wrapper .calc-box {
background: #f9fbfd;
border: 1px solid #e1e4e8;
border-radius: 8px;
padding: 30px;
box-shadow: 0 4px 6px rgba(0,0,0,0.05);
margin-bottom: 40px;
}
#roofing-calculator-wrapper h2 {
color: #2c3e50;
border-bottom: 2px solid #3498db;
padding-bottom: 10px;
margin-top: 30px;
}
#roofing-calculator-wrapper h3 {
color: #34495e;
margin-top: 20px;
}
#roofing-calculator-wrapper .form-group {
margin-bottom: 20px;
}
#roofing-calculator-wrapper label {
display: block;
margin-bottom: 8px;
font-weight: 600;
color: #2c3e50;
}
#roofing-calculator-wrapper select,
#roofing-calculator-wrapper input[type="number"] {
width: 100%;
padding: 12px;
border: 1px solid #bdc3c7;
border-radius: 6px;
font-size: 16px;
box-sizing: border-box; /* Fix for padding increasing width */
}
#roofing-calculator-wrapper .checkbox-group {
display: flex;
align-items: center;
}
#roofing-calculator-wrapper input[type="checkbox"] {
width: 20px;
height: 20px;
margin-right: 10px;
}
#roofing-calculator-wrapper button.calc-btn {
background-color: #e67e22;
color: white;
border: none;
padding: 15px 30px;
font-size: 18px;
font-weight: bold;
border-radius: 6px;
cursor: pointer;
width: 100%;
transition: background-color 0.3s;
margin-top: 10px;
}
#roofing-calculator-wrapper button.calc-btn:hover {
background-color: #d35400;
}
#roofing-calculator-wrapper .results-box {
background-color: #fff;
border: 1px solid #27ae60;
border-radius: 8px;
padding: 20px;
margin-top: 25px;
display: none;
text-align: center;
}
#roofing-calculator-wrapper .result-value {
font-size: 32px;
font-weight: bold;
color: #27ae60;
margin: 10px 0;
}
#roofing-calculator-wrapper .breakdown-row {
display: flex;
justify-content: space-between;
border-bottom: 1px solid #eee;
padding: 8px 0;
font-size: 14px;
}
#roofing-calculator-wrapper .disclaimer {
font-size: 12px;
color: #7f8c8d;
margin-top: 15px;
font-style: italic;
}
#roofing-calculator-wrapper table {
width: 100%;
border-collapse: collapse;
margin: 20px 0;
}
#roofing-calculator-wrapper th, #roofing-calculator-wrapper td {
border: 1px solid #ddd;
padding: 12px;
text-align: left;
}
#roofing-calculator-wrapper th {
background-color: #f2f2f2;
}
function calculateRoofCost() {
// 1. Get Input Values
var areaInput = document.getElementById("roofArea").value;
var materialCostPerSqFt = parseFloat(document.getElementById("roofMaterial").value);
var pitchFactor = parseFloat(document.getElementById("roofPitch").value);
var includeTearOff = document.getElementById("tearOff").checked;
// 2. Validation
if (!areaInput || areaInput <= 0) {
alert("Please enter a valid roof area in square feet.");
return;
}
var area = parseFloat(areaInput);
// 3. Define Constants
// Base labor rate per sq ft (Standard walkability)
var baseLaborRate = 2.50;
// Tear off cost per sq ft
var tearOffRate = 1.25;
// Waste factor (10%)
var wasteFactor = 1.10;
// 4. Calculations
// Adjust labor based on pitch complexity
// Steep roofs cost more labor, not more material (though waste is higher, we handle waste separately)
var adjustedLaborRate = baseLaborRate * pitchFactor;
// Material Cost Calculation
// Material cost * Area * Waste Factor
var totalMaterialCost = materialCostPerSqFt * area * wasteFactor;
// Labor Cost Calculation
var totalLaborCost = adjustedLaborRate * area;
// Tear Off Calculation
var totalTearOffCost = 0;
if (includeTearOff) {
totalTearOffCost = tearOffRate * area;
}
// Total Base Estimate
var subTotal = totalMaterialCost + totalLaborCost + totalTearOffCost;
// Create a Low and High Range (+/- 10% for regional variance)
var lowEstimate = subTotal * 0.90;
var highEstimate = subTotal * 1.10;
// 5. Formatting Helper
var formatter = new Intl.NumberFormat('en-US', {
style: 'currency',
currency: 'USD',
maximumFractionDigits: 0
});
// 6. Output Results
document.getElementById("totalCostResult").innerHTML =
formatter.format(lowEstimate) + " – " + formatter.format(highEstimate);
document.getElementById("materialResult").innerHTML = formatter.format(totalMaterialCost);
document.getElementById("laborResult").innerHTML = formatter.format(totalLaborCost);
document.getElementById("tearOffResult").innerHTML = formatter.format(totalTearOffCost);
// Waste is implicitly included in material, but for breakdown let's show the added cost relative to net area
// Calculation: (Material Rate * Area * 0.10)
var wasteCostVal = (materialCostPerSqFt * area * 0.10);
document.getElementById("wasteResult").innerHTML = "~" + formatter.format(wasteCostVal) + " (Included in Material)";
// Show results div
document.getElementById("resultDisplay").style.display = "block";
}
Roof Replacement Cost Estimator
If you know your home's footprint, multiply by 1.5 for an estimate.
Asphalt Shingles (Standard) – Approx $4.50/sq.ft
Architectural Shingles – Approx $6.50/sq.ft
Metal Roofing (Standing Seam) – Approx $11.00/sq.ft
Clay/Concrete Tile – Approx $14.00/sq.ft
Natural Slate – Approx $20.00/sq.ft
Wood Shake – Approx $8.00/sq.ft
Flat or Low Slope (Walkable)
Medium Slope (Average Home)
Steep Slope (Difficult to walk)
Very Steep/Complex (Requires safety harness)
Estimated Total Cost Range
$0 – $0
Material Estimate:
–
Labor & Installation:
–
Old Roof Removal:
–
Waste Factor (10%):
–
*Estimates are national averages including materials and professional labor. Actual contractor quotes may vary based on location, access, and market rates.
Understanding Roofing Costs in 2024
Replacing a roof is one of the most significant investments a homeowner can make. The cost varies drastically depending on the materials selected, the size of your home, and the complexity of the roof's design. This Roofing Cost Calculator provides a realistic estimate based on current market data for materials and labor.
Key Factors Affecting Your Quote
- Material Choice: Asphalt shingles are the most affordable and common option, typically costing between $3.50 and $5.50 per square foot installed. Premium materials like slate or copper can cost 4x to 5x more.
- Roof Pitch (Slope): Steeper roofs require more safety equipment and move slower, increasing labor costs significantly. A "walkable" roof is cheaper to replace than a steep Victorian-style roof.
- Tear-Off: Removing existing layers of shingles adds labor and disposal fees. If you have two layers of old shingles, this cost can double.
- Accessibility: If a truck cannot get close to the house, or if there are extensive gardens to protect, contractors may charge extra for logistics.
Average Costs by Material Type
Here is a breakdown of what you might expect to pay per "square" (a roofing term for 100 square feet) for materials and labor combined:
| Material | Average Cost per Sq. Ft. | Lifespan |
|---|---|---|
| Asphalt (3-Tab) | $3.50 – $5.50 | 15-20 Years |
| Architectural Shingles | $5.50 – $8.00 | 25-30 Years |
| Metal (Standing Seam) | $9.00 – $14.00 | 40-70 Years |
| Clay/Concrete Tile | $12.00 – $18.00 | 50+ Years |
| Natural Slate | $18.00 – $30.00 | 100+ Years |
How to Measure Your Roof
Most homeowners know their floor plan square footage, but the roof is always larger due to overhangs and the slope. A good rule of thumb for a quick estimate is to take your home's ground floor footage (including garage and porches) and multiply it by 1.5 to account for pitch and overhangs.
Frequently Asked Questions
Is it cheaper to overlay a new roof over the old one?
Yes, overlaying (reroofing) saves the cost of tearing off the old materials, usually saving $1,000 to $2,000. However, most building codes only allow two layers, and overlaying can mask underlying deck rot and shorten the lifespan of the new shingles.
Does homeowners insurance cover roof replacement?
Typically, insurance covers replacement if the damage is caused by an act of nature (hail, wind, fallen trees). It generally does not cover replacement due to normal wear and tear or age.