Hardie Board Siding Calculator

Hardie Board Siding Cost Calculator

Estimate the materials and costs for your Hardie Board siding project. This calculator helps you determine the number of boards, trim, house wrap, and overall project cost based on your home's dimensions and chosen materials.

Project Dimensions

Windows & Doors

Siding & Material Details

Cost Estimates

function calculateHardieSiding() { // Get input values var totalWallAreaSqFt = parseFloat(document.getElementById("totalWallAreaSqFt").value); var avgWallHeightFt = parseFloat(document.getElementById("avgWallHeightFt").value); var numWindows = parseFloat(document.getElementById("numWindows").value); var avgWindowWidthFt = parseFloat(document.getElementById("avgWindowWidthFt").value); var avgWindowHeightFt = parseFloat(document.getElementById("avgWindowHeightFt").value); var numDoors = parseFloat(document.getElementById("numDoors").value); var avgDoorWidthFt = parseFloat(document.getElementById("avgDoorWidthFt").value); var avgDoorHeightFt = parseFloat(document.getElementById("avgDoorHeightFt").value); var numCorners = parseFloat(document.getElementById("numCorners").value); var sidingBoardLengthFt = parseFloat(document.getElementById("sidingBoardLengthFt").value); var sidingBoardExposedWidthIn = parseFloat(document.getElementById("sidingBoardExposedWidthIn").value); var wasteFactorPercent = parseFloat(document.getElementById("wasteFactorPercent").value); var costPerSidingBoard = parseFloat(document.getElementById("costPerSidingBoard").value); var costPerLinearFootTrim = parseFloat(document.getElementById("costPerLinearFootTrim").value); var costPerSqFtHouseWrap = parseFloat(document.getElementById("costPerSqFtHouseWrap").value); var laborCostPerSqFt = parseFloat(document.getElementById("laborCostPerSqFt").value); // Input validation if (isNaN(totalWallAreaSqFt) || totalWallAreaSqFt < 0 || isNaN(avgWallHeightFt) || avgWallHeightFt <= 0 || isNaN(numWindows) || numWindows < 0 || isNaN(avgWindowWidthFt) || avgWindowWidthFt < 0 || isNaN(avgWindowHeightFt) || avgWindowHeightFt < 0 || isNaN(numDoors) || numDoors < 0 || isNaN(avgDoorWidthFt) || avgDoorWidthFt < 0 || isNaN(avgDoorHeightFt) || avgDoorHeightFt < 0 || isNaN(numCorners) || numCorners < 0 || isNaN(sidingBoardLengthFt) || sidingBoardLengthFt <= 0 || isNaN(sidingBoardExposedWidthIn) || sidingBoardExposedWidthIn <= 0 || isNaN(wasteFactorPercent) || wasteFactorPercent 100 || isNaN(costPerSidingBoard) || costPerSidingBoard < 0 || isNaN(costPerLinearFootTrim) || costPerLinearFootTrim < 0 || isNaN(costPerSqFtHouseWrap) || costPerSqFtHouseWrap < 0 || isNaN(laborCostPerSqFt) || laborCostPerSqFt < 0) { document.getElementById("result").innerHTML = "Please enter valid positive numbers for all fields."; return; } // Calculate opening areas var totalWindowAreaSqFt = numWindows * avgWindowWidthFt * avgWindowHeightFt; var totalDoorAreaSqFt = numDoors * avgDoorWidthFt * avgDoorHeightFt; var totalOpeningAreaSqFt = totalWindowAreaSqFt + totalDoorAreaSqFt; // Calculate net siding area var netSidingAreaSqFt = totalWallAreaSqFt – totalOpeningAreaSqFt; if (netSidingAreaSqFt < 0) { netSidingAreaSqFt = 0; // Cannot have negative siding area document.getElementById("result").innerHTML = "Warning: Total opening area exceeds total wall area. Siding area set to 0."; } // Calculate siding boards needed var sidingBoardExposedWidthFt = sidingBoardExposedWidthIn / 12; var areaPerBoardSqFt = sidingBoardLengthFt * sidingBoardExposedWidthFt; var sidingAreaWithWaste = netSidingAreaSqFt * (1 + wasteFactorPercent / 100); var numSidingBoards = Math.ceil(sidingAreaWithWaste / areaPerBoardSqFt); // Calculate trim linear feet var cornerTrimLength = numCorners * avgWallHeightFt; var windowTrimLength = numWindows * (2 * avgWindowWidthFt + 2 * avgWindowHeightFt); var doorTrimLength = numDoors * (2 * avgDoorWidthFt + 2 * avgDoorHeightFt); var totalLinearFeetTrim = cornerTrimLength + windowTrimLength + doorTrimLength; // Calculate costs var sidingMaterialCost = numSidingBoards * costPerSidingBoard; var trimMaterialCost = totalLinearFeetTrim * costPerLinearFootTrim; var houseWrapCost = totalWallAreaSqFt * costPerSqFtHouseWrap; // House wrap covers total wall area var totalMaterialCost = sidingMaterialCost + trimMaterialCost + houseWrapCost; var laborCost = netSidingAreaSqFt * laborCostPerSqFt; var totalProjectCost = totalMaterialCost + laborCost; // Display results var resultsHtml = "

Estimated Project Costs

"; resultsHtml += "Total Siding Area Needed: " + netSidingAreaSqFt.toFixed(2) + " sq ft"; resultsHtml += "Number of Siding Boards: " + numSidingBoards + " boards"; resultsHtml += "Total Linear Feet of Trim: " + totalLinearFeetTrim.toFixed(2) + " ft"; resultsHtml += "Estimated Siding Material Cost: $" + sidingMaterialCost.toFixed(2) + ""; resultsHtml += "Estimated Trim Material Cost: $" + trimMaterialCost.toFixed(2) + ""; resultsHtml += "Estimated House Wrap Cost: $" + houseWrapCost.toFixed(2) + ""; resultsHtml += "Estimated Total Material Cost: $" + totalMaterialCost.toFixed(2) + ""; resultsHtml += "Estimated Labor Cost: $" + laborCost.toFixed(2) + ""; resultsHtml += "

Estimated Total Project Cost: $" + totalProjectCost.toFixed(2) + "

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Understanding Hardie Board Siding and Your Project Costs

Hardie Board, also known as fiber cement siding, is a popular choice for homeowners due to its exceptional durability, resistance to pests, fire, and rot, and its aesthetic versatility. Mimicking the look of wood siding, stucco, or cedar shingles, Hardie Board offers a long-lasting, low-maintenance exterior solution. However, estimating the cost for a Hardie Board siding project can be complex, involving various material and labor considerations.

Why Use a Hardie Board Siding Calculator?

A specialized calculator like this helps you get a preliminary estimate for your project, allowing for better budgeting and planning. It breaks down the costs into key components, giving you a clearer picture of where your money will go. This is crucial for comparing quotes from contractors and ensuring you have enough material.

Key Factors Influencing Hardie Board Siding Costs

1. Total Wall Area: The most significant factor. The larger your home's exterior, the more siding material you'll need. Accurately measuring the total square footage of your walls is the first step.
2. Openings (Windows & Doors): While these reduce the amount of siding needed, they increase the demand for trim materials. Each window and door requires specific trim pieces for a finished look.
3. Siding Board Dimensions: Hardie Plank comes in standard lengths (e.g., 12 feet) and various widths. The "exposed width" (the part visible after overlapping) directly impacts how many boards are needed to cover a given area.
4. Waste Factor: Cutting siding to fit around windows, doors, and corners inevitably leads to some material waste. A typical waste factor of 10-15% is usually added to material estimates to account for this.
5. Cost per Siding Board: Prices vary based on the specific Hardie product line (e.g., Plank, Shingle, Panel), color, texture, and your local supplier.
6. Trim Materials: HardieTrim boards are used for corners, around windows and doors, and as fascia. Their cost is calculated by linear foot.
7. House Wrap/Underlayment: A crucial component installed beneath the siding to provide an additional layer of moisture protection and improve energy efficiency. This is typically priced per square foot of the total wall area.
8. Labor Costs: Installing Hardie Board is a labor-intensive process requiring specialized skills. Labor costs are often quoted per square foot and can vary significantly based on your location, the complexity of the installation (e.g., multi-story homes, intricate architectural details), and the contractor's experience.

How to Measure for Your Hardie Board Project

• Total Wall Area: Measure the length of each exterior wall and multiply by its height. Sum these areas for your total wall square footage. For complex homes, consider breaking down walls into simpler rectangles.
• Windows and Doors: Measure the width and height of each window and door to calculate their individual areas. Sum these to get the total opening area. This area will be subtracted from your total wall area to determine the net siding area.
• Corners: Count the number of exterior corners on your home. Each corner will require trim from the ground to the roofline.
• Average Wall Height: This is used to estimate the linear feet of trim needed for corners.

Example Calculation Scenario:

Let's consider a small, single-story home with:

• Total Exterior Wall Area: 1500 sq ft
• Average Wall Height: 9 ft
• 8 Windows (avg 3ft W x 4ft H)
• 2 Doors (avg 3ft W x 7ft H)
• 4 Exterior Corners
• Hardie Plank (12 ft Length, 7.25 inch Exposed Width)
• 10% Waste Factor
• Siding Board Cost: $35/board
• Trim Cost: $3.50/linear ft
• House Wrap Cost: $0.25/sq ft
• Labor Cost: $8/sq ft

Using the calculator with these inputs:

• Total Window Area: 8 * (3ft * 4ft) = 96 sq ft
• Total Door Area: 2 * (3ft * 7ft) = 42 sq ft
• Total Opening Area: 96 + 42 = 138 sq ft
• Net Siding Area: 1500 – 138 = 1362 sq ft
• Siding Board Exposed Width: 7.25 inches = 0.604 ft
• Area per Board: 12 ft * 0.604 ft = 7.25 sq ft
• Siding Area with Waste: 1362 sq ft * 1.10 = 1498.2 sq ft
• Number of Siding Boards: ceil(1498.2 / 7.25) = 207 boards
• Corner Trim: 4 corners * 9 ft = 36 linear ft
• Window Trim: 8 windows * (2*3ft + 2*4ft) = 8 * (6+8) = 8 * 14 = 112 linear ft
• Door Trim: 2 doors * (2*3ft + 2*7ft) = 2 * (6+14) = 2 * 20 = 40 linear ft
• Total Linear Feet Trim: 36 + 112 + 40 = 188 linear ft
• Siding Material Cost: 207 boards * $35/board = $7245
• Trim Material Cost: 188 ft * $3.50/ft = $658
• House Wrap Cost: 1500 sq ft * $0.25/sq ft = $375
• Total Material Cost: $7245 + $658 + $375 = $8278
• Labor Cost: 1362 sq ft * $8/sq ft = $10896
• Total Project Cost: $8278 + $10896 = $19174

This example demonstrates how the calculator processes your inputs to provide a comprehensive cost breakdown. Remember that these are estimates, and actual costs may vary based on market fluctuations, specific product choices, and contractor bids.