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Roofing Replacement Cost Calculator

Estimate your roofing project cost based on square footage, material type, and roof complexity.

Flat (0/12 – 2/12) Low Pitch (3/12 – 5/12) Medium Pitch (6/12 – 9/12) Steep Pitch (10/12 – 12/12)
Asphalt Shingles (Basic) Architectural Shingles (Premium) Metal Roofing Slate or Clay Tile
None (New Construction) 1 Layer 2 Layers

Projected Cost: $0.00

Estimated Squares: 0 (100 sq ft each)

Labor & Material Rate: $0.00 per sq ft

*This is an estimate based on average national rates. Local labor prices, waste factors (usually 10-15%), and specific flashing/venting requirements may change final quotes.

Understanding Your Roofing Estimate

A new roof is one of the most significant investments a homeowner can make. When calculating costs, contractors look at several critical factors beyond just the size of your home.

1. Roof Size and "Squares"

In the roofing industry, the term "square" is used to describe a 10-foot by 10-foot area (100 square feet). If your roof is 2,000 square feet, it consists of 20 squares. Most material prices and labor rates are quoted "per square."

2. Pitch and Complexity

The steeper the roof (pitch), the more difficult and dangerous it is to work on. High-pitched roofs require specialized safety equipment and more time, which increases labor costs. Additionally, complex roof designs with multiple valleys, dormers, and chimneys require more flashing and detail work, increasing both material waste and labor hours.

3. Material Selection

  • Asphalt Shingles: The most common and cost-effective option, lasting 15-30 years.
  • Architectural Shingles: A thicker, more durable version of asphalt that provides a 3D look.
  • Metal: Highly durable, fire-resistant, and can last 50+ years, though more expensive upfront.
  • Slate/Tile: The most expensive and heaviest materials, often requiring structural reinforcement but lasting over a century.

4. Tear-off and Disposal

If you are replacing an old roof, the old shingles must be removed and disposed of. Removing two layers of old shingles costs significantly more than one layer due to the extra weight and labor involved in demolition.

Example Calculation

If you have a 2,500 sq ft roof with a medium pitch (1.25 multiplier) and choose Asphalt Shingles ($4.50/sq ft) with 1 layer of removal ($1.50/sq ft):

  • Adjusted Area: 2,500 x 1.25 = 3,125 sq ft
  • Total Rate: $4.50 (Material) + $1.50 (Tear-off) = $6.00 per sq ft
  • Total Estimate: 3,125 x $6.00 = $18,750
function calculateRoofCost() { var area = parseFloat(document.getElementById('roofArea').value); var pitchMultiplier = parseFloat(document.getElementById('roofPitch').value); var materialRate = parseFloat(document.getElementById('roofMaterial').value); var removalRate = parseFloat(document.getElementById('removalLayers').value); if (isNaN(area) || area <= 0) { alert("Please enter a valid roof area."); return; } // Step 1: Adjust area for pitch (steeper roofs have more surface area for the same footprint) var adjustedArea = area * pitchMultiplier; // Step 2: Calculate squares (standard roofing unit) var squares = adjustedArea / 100; // Step 3: Combine rates var totalRatePerSqFt = materialRate + removalRate; // Step 4: Final calculation var totalCost = adjustedArea * totalRatePerSqFt; // Formatting var formattedTotal = totalCost.toLocaleString('en-US', { style: 'currency', currency: 'USD', }); var formattedRate = totalRatePerSqFt.toLocaleString('en-US', { style: 'currency', currency: 'USD', }); // Display Results document.getElementById('totalPriceDisplay').innerText = formattedTotal; document.getElementById('squaresDisplay').innerText = squares.toFixed(2); document.getElementById('rateDisplay').innerText = formattedRate; document.getElementById('roofResult').style.display = 'block'; // Smooth scroll to result document.getElementById('roofResult').scrollIntoView({ behavior: 'smooth', block: 'nearest' }); }

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