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Roof Replacement Cost Estimator

Flat/Low Slope (Easiest) Medium Slope (Standard) Steep Slope (Difficult)
Asphalt Shingles (Most Common) Metal Roofing (Standing Seam) Clay/Concrete Tile Natural Slate
function calculateRoofCost() { var areaInput = document.getElementById('roofArea'); var areaSqFt = parseFloat(areaInput.value); var resultBox = document.getElementById('roofingResultBox'); if (isNaN(areaSqFt) || areaSqFt <= 0) { resultBox.style.display = 'block'; resultBox.innerHTML = 'Please enter a valid positive number for the roof area.'; return; } var pitchSelect = document.getElementById('roofPitch'); var pitchValue = pitchSelect.value; var pitchMultiplier = 1.0; // Pitch affects labor difficulty and actual surface area vs footprint if (pitchValue === 'medium') { pitchMultiplier = 1.15; } else if (pitchValue === 'steep') { pitchMultiplier = 1.35; } var materialSelect = document.getElementById('roofMaterial'); var materialValue = materialSelect.value; // Base installed cost per sq ft (material + standard labor overhead) var baseCostPerSqFt = 4.50; // asphalt default if (materialValue === 'metal') { baseCostPerSqFt = 12.00; } else if (materialValue === 'tile') { baseCostPerSqFt = 18.00; } else if (materialValue === 'slate') { baseCostPerSqFt = 28.00; } var tearOffCheckbox = document.getElementById('tearOffRequired'); var tearOffAdder = 0; if (tearOffCheckbox.checked) { // Additional cost per sq ft for removal and disposal tearOffAdder = 2.50; } // Calculate adjusted area based on pitch var adjustedArea = areaSqFt * pitchMultiplier; // Calculate total base cost var totalBaseCost = adjustedArea * (baseCostPerSqFt + tearOffAdder); // Apply a market variance range (+/- 15%) var lowEstimate = totalBaseCost * 0.85; var highEstimate = totalBaseCost * 1.15; // Helper function to format currency function toUSD(num) { return num.toLocaleString('en-US', { style: 'currency', currency: 'USD', maximumFractionDigits: 0 }); } var roofing Squares = adjustedArea / 100; var outputHTML = '

Estimated Project Total

'; outputHTML += " + toUSD(lowEstimate) + ' – ' + toUSD(highEstimate) + "; outputHTML += 'Based on approximately ' + roofingSquares.toFixed(1) + ' Roofing Squares (' + adjustedArea.toFixed(0) + ' actual sq. ft. adjusted for pitch).'; outputHTML += 'Note: This is a preliminary estimate for budgeting purposes. Final costs depend on local labor rates, material availability, complex roof features (dormers, valleys), and contractor pricing.'; resultBox.style.display = 'block'; resultBox.innerHTML = outputHTML; }

Understanding Your Roof Replacement Estimate

Budgeting for a new roof is a significant undertaking for any homeowner. The total cost of a roofing project is rarely a single fixed number; it fluctuates based on material choices, the complexity of your roof's architecture, and necessary labor.

Our Roofing Cost Estimator is designed to give you a realistic price bracket based on the primary drivers of roofing expenses. Below is a breakdown of how these factors influence your final quote.

Key Factors Influencing Roofing Costs

  • Total Roof Area (Square Feet): This is the most critical factor. Roofers often measure in "squares," where one square equals 100 square feet. The larger the roof, the more materials and man-hours required.
  • Roof Pitch (Slope): The steepness of your roof significantly affects labor costs. A flat or low-slope roof is easier and safer to walk on. A steep roof requires special safety equipment, takes longer to install, and actually has more surface area than its footprint suggests.
  • Material Type: The material you choose has the largest impact on the price per square foot.
    • Asphalt Shingles: The most common and generally most affordable option.
    • Metal Roofing: More durable and long-lasting, but comes at a higher material and installation premium.
    • Tile or Slate: Premium materials that are extremely heavy, requiring specialized labor and sometimes structural reinforcement, leading to the highest costs.
  • Tear-off Requirements: If your existing roof has multiple layers of old shingles, or if the decking underneath is damaged, the old roof must be "torn off" before the new one is installed. This adds significant labor and disposal fees to the project.

Realistic Cost Estimate Example

To understand how these variables interact, consider a typical suburban home.

Let's assume a homeowner has a house with a 2,200 sq. ft. roof footprint. The roof has a standard medium pitch, making it moderately difficult to work on. They choose standard architectural asphalt shingles and require the single existing layer of old shingles to be torn off.

Using these inputs in the calculator above, the estimated range would likely fall between $15,000 and $20,500. This estimate accounts for the material costs, the extra labor due to the pitch, and the disposal fees for the old roof. A homeowner choosing premium slate for the same roof could easily see estimates exceed $50,000 due to the high material cost and specialized installation required.

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