Washington State Income Tax Rate Calculator

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Roof Replacement Cost Estimator

3-Tab Asphalt Shingles (Economy) Architectural Shingles (Standard) Metal Seam (Premium) Clay/Concrete Tile Natural Slate
Flat / Low Slope (Walkable) Medium Slope (Standard 4/12 – 7/12) Steep Slope (Hard 8/12 – 12/12) Very Steep (Requires Harness)
Material Cost (inc. 10% waste): $0.00
Labor & Installation: $0.00
Tear-off & Disposal: $0.00
Total Estimated Cost: $0.00
*Estimated cost range:

Understanding Your Roof Replacement Quote

Replacing a roof is a significant investment for any homeowner. This calculator provides a realistic estimate based on the specific variables that contractors use to bid jobs. Understanding these factors can help you budget effectively and evaluate quotes.

1. Roofing Material Costs

The material you choose has the largest impact on price. While standard Asphalt Shingles are the most affordable option (averaging $4.50-$6.50 per sq. ft. installed), premium materials like Metal or Slate last significantly longer but come with a higher upfront cost. Our calculator accounts for a standard 10% waste factor, which is industry standard for cutting and overlapping materials.

2. Pitch and Complexity

Roof pitch refers to the steepness of your roof. A "steep" roof is more dangerous and difficult to work on, requiring special safety equipment, harnesses, and slower working speeds.

  • Low Slope: Easier to walk on, lower labor costs.
  • Medium Slope: Standard residential pitch.
  • Steep Slope: Increases labor costs by 35% or more due to difficulty.

3. Tear-off and Disposal

If you have an existing layer of shingles, they usually need to be removed (torn off) before the new roof is installed. This process involves labor to strip the roof and dump fees for disposal. Skipping this step (overlaying) is cheaper but can hide structural issues and shorten the lifespan of the new roof.

4. Regional Variances

Please note that labor rates vary by zip code. This estimator uses national averages for 2024. In high-cost-of-living areas, expect to pay towards the higher end of the estimated range.

function calculateRoofCost() { // Get Inputs var areaInput = document.getElementById('roofArea').value; var materialPricePerSqFt = parseFloat(document.getElementById('roofMaterial').value); var pitchFactor = parseFloat(document.getElementById('roofPitch').value); var includeTearOff = document.getElementById('tearOff').checked; // Validation if (!areaInput || isNaN(areaInput) || areaInput Assuming dropdown is full installed price? // No, let's treat dropdown values as "Material Cost per Sq Ft" roughly: // Asphalt: $1.50 material + Labor. // Let's re-map the dropdown values to be Pure Material Cost for calculation accuracy. // Asphalt 3-tab: ~$1.20 | Arch: ~$1.50 | Metal: ~$4.00 | Tile: ~$5.00 | Slate: ~$8.00 // The values in HTML option values currently look like "Installed" prices (4.50, etc). // Let's treat the HTML value as the BASE INSTALLED COST per sq ft (Material + Basic Labor). var baseInstalledRate = materialPricePerSqFt; // Extract Material vs Labor portion roughly (40% Mat, 60% Labor is typical) var materialPortion = baseInstalledRate * 0.45; var laborPortion = baseInstalledRate * 0.55; // Apply Pitch Multiplier ONLY to the labor portion var adjustedLabor = laborPortion * pitchFactor; // Total Base Cost per Sq Ft (adjusted for pitch) var finalRatePerSqFt = materialPortion + adjustedLabor; // Total Project Cost Calculation var totalProjectCost = totalAreaWithWaste * finalRatePerSqFt; // Add Tear Off if selected var tearOffCost = 0; if (includeTearOff) { tearOffCost = area * tearOffPricePerSqFt; // Tear off usually calculated on actual area, not waste area totalProjectCost += tearOffCost; } // Calculate breakdown for display var displayMaterial = (totalAreaWithWaste * materialPortion); var displayLabor = (totalAreaWithWaste * adjustedLabor); // Calculate Range (+/- 15%) var lowEnd = totalProjectCost * 0.85; var highEnd = totalProjectCost * 1.15; // Output Formatting var formatter = new Intl.NumberFormat('en-US', { style: 'currency', currency: 'USD', minimumFractionDigits: 2 }); document.getElementById('resMaterial').innerText = formatter.format(displayMaterial); document.getElementById('resLabor').innerText = formatter.format(displayLabor); var tearOffRow = document.getElementById('rowTearOff'); if (includeTearOff) { tearOffRow.style.display = 'flex'; document.getElementById('resTearOff').innerText = formatter.format(tearOffCost); } else { tearOffRow.style.display = 'none'; } document.getElementById('resTotal').innerText = formatter.format(totalProjectCost); document.getElementById('resRange').innerText = formatter.format(lowEnd) + " – " + formatter.format(highEnd); // Show Results document.getElementById('roofResult').style.display = 'block'; }

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