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Roofing Replacement Cost Calculator

Include garage and overhangs. 100 sq ft = 1 "Square".
Asphalt Shingles (Standard) Architectural Shingles (Premium) Standing Seam Metal Clay or Concrete Tile Natural Slate
Flat or Low Slope (Walkable) Standard Pitch (4/12 to 8/12) Steep Pitch / Complex Valleys
Standard / Rural Area High Cost of Living Area (Major City)

Estimated Project Total:

function calculateRoof() { var area = parseFloat(document.getElementById('roofArea').value); var materialPrice = parseFloat(document.getElementById('roofMaterial').value); var pitchMultiplier = parseFloat(document.getElementById('roofPitch').value); var laborMultiplier = parseFloat(document.getElementById('laborCost').value); var resultDiv = document.getElementById('roofResult'); var priceDisplay = document.getElementById('priceRange'); var breakdownDisplay = document.getElementById('breakdownText'); if (isNaN(area) || area <= 0) { alert("Please enter a valid roof area."); return; } // Calculation logic // Base cost = Area * (Material Price per sq ft) // Adjusted by Pitch (Steeper = more labor/danger) // Adjusted by regional labor rates // 10% waste factor included var wasteFactor = 1.10; var baseCost = area * materialPrice * pitchMultiplier * laborMultiplier * wasteFactor; // Create a range (+/- 15%) to account for site-specific variables var lowEstimate = baseCost * 0.9; var highEstimate = baseCost * 1.15; priceDisplay.innerHTML = "$" + lowEstimate.toLocaleString(undefined, {minimumFractionDigits: 0, maximumFractionDigits: 0}) + " – $" + highEstimate.toLocaleString(undefined, {minimumFractionDigits: 0, maximumFractionDigits: 0}); breakdownDisplay.innerHTML = "Based on " + area + " sq ft with a 10% waste factor. This estimate includes tear-off, disposal, materials, and labor for a standard installation."; resultDiv.style.display = 'block'; }

Understanding Roofing Replacement Costs in 2024

Replacing a roof is one of the most significant investments a homeowner will make. On average, most homeowners spend between $6,500 and $15,000 for a standard asphalt shingle roof. However, your specific price depends heavily on the "square" count, material choice, and architectural complexity.

Key Factors That Influence Your Quote

  • Roof Size (Squares): In the roofing industry, one "square" is 100 square feet. A 2,000 sq. ft. roof equals 20 squares. Contractors buy materials and calculate labor based on this unit.
  • Material Type: Asphalt shingles are the most affordable, while metal and slate offer superior longevity at a much higher price point. Metal roofs can last 50+ years, whereas standard shingles typically last 15-25 years.
  • Pitch and Slope: A "walkable" roof (low pitch) is easier and faster to install. A steep-pitched roof requires specialized safety equipment and more labor hours, increasing the cost by 20% to 50%.
  • Underlying Damage: Our calculator assumes your roof deck (the wood beneath the shingles) is in good condition. If your contractor finds rot or water damage during the tear-off process, expect to pay $75–$120 per plywood sheet replaced.

Detailed Calculation Example

Let's look at a realistic scenario for a standard suburban home:

Component Estimated Cost
2,000 Sq. Ft. Asphalt Shingles $8,000 – $11,000
Old Roof Tear-off & Disposal $1,500 – $3,000
Flashing, Vents & Underlayment $1,000 – $2,000
Total Estimated Investment $10,500 – $16,000

How to Use This Calculator

To get the most accurate result from our tool, measure the footprint of your home and add roughly 10-15% to account for the angle of the roof and overhangs. If you have a two-car garage that is attached, don't forget to include its area in your total square footage calculation. While this tool provides a high-quality estimate, always get at least three quotes from licensed and insured local contractors to verify current regional pricing and supply chain costs.

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