e.g. 50
e.g. 30
e.g. 9
~15 sq ft each subtracted
~20 sq ft each subtracted
10% standard, 15% for complex walls
Hardie Board Estimate
HardiePlank Lap Siding - Quantity
Accessories
Cost Breakdown
Estimated Total (Siding + Trim + Labor)
$6,649 – $13,381
1,280.00 sq ft of hardieplank lap siding
12,800+ estimates calculated this month
Last updated: 2026-07-05
Quick Answer: How Much Hardie Board Do You Need?
Take your net wall area (perimeter x wall height, minus doors and windows), add 10% for waste, then divide by the coverage per plank. The most common 6.25" HardiePlank at 5" exposure covers 5 sq ft per 12-foot board, so 1,500 sq ft of wall area needs about 330 planks (15 squares). Installed, HardiePlank fiber cement siding runs $5 to $10 per square foot, or roughly $7,500 to $15,000 for that same wall.
Hardie Board Siding Cost by Product (2026)
| Product | Material $/SF | Labor $/SF | Installed $/SF | Best For |
|---|---|---|---|---|
| HardiePlank Lap | $1.50–$4.00 | $3.50–$6.00 | $5.00–$10.00 | Most homes (traditional look) |
| HardiePanel Vertical | $1.75–$4.50 | $3.00–$5.50 | $4.75–$10.00 | Modern / board-and-batten |
| HardieShingle | $2.50–$6.00 | $5.00–$8.00 | $7.50–$14.00 | Cape Cod / craftsman styles |
| HardieTrim (per LF) | $1.50–$3.50 | Incl. in labor | $1.50–$3.50 | Corners, windows, door frames |
Prices are per square foot (siding) or per linear foot (trim). ColorPlus pre-finished adds $0.50–$1.00/sf over primed. Regional pricing varies by market.
HardiePlank Count and Cost by Wall Area (2026)
| Net Wall Area | Squares | HardiePlank (6.25", +10% waste) | Installed Cost |
|---|---|---|---|
| 500 sq ft | 5 | ~110 planks | $2,500 - $5,000 |
| 1,000 sq ft | 10 | ~220 planks | $5,000 - $10,000 |
| 1,500 sq ft | 15 | ~330 planks | $7,500 - $15,000 |
| 2,000 sq ft | 20 | ~440 planks | $10,000 - $20,000 |
| 2,500 sq ft | 25 | ~550 planks | $12,500 - $25,000 |
Plank counts use the common 6.25" HardiePlank (5" exposure, 5 sq ft per board) with a 10% waste factor. Wall area is siding area, not floor area: a single-story 1,500 sq ft house typically has 1,100 to 1,400 sq ft of wall area, and a two-story home of the same footprint has close to double.
Where Hardie Board Estimates Go Wrong
- Estimating off floor area instead of wall area. A two-story house has almost double the siding area of its footprint. Measure the walls, not the square footage on the listing.
- Forgetting HardieTrim. Corners, windows, and doors add up fast. A single-story home can eat 170 to 200 linear feet of trim, and at $1.50 to $3.50 per foot that is $300 to $700 nobody budgeted.
- Using the wrong nails. Fiber cement needs stainless steel or hot-dipped galvanized siding nails. Regular nails rust and leave brown streaks down a brand new wall inside a year.
- Skipping the weather barrier. James Hardie requires a housewrap behind every install. Leave it out and you void the warranty. Budget $0.15 to $0.30 per square foot to do it right.
- Running 10% waste on a cut-heavy house. Gable ends, dormers, and a wall full of windows push waste to 15%. Snap one $8 plank on the last course and you are driving back to the supplier instead of finishing the job.
Hardie Board Siding Cost & Sizing Guide
Pricing, plank sizes, installation requirements, and product comparisons for James Hardie fiber cement siding.
How Much Does Hardie Board Siding Cost in 2026?
HardiePlank fiber cement siding costs $5-$10 per square foot installed, making it one of the best value upgrades over vinyl. Total project costs for a typical 1,500-2,000 sq ft home run $12,000-$30,000 depending on product style and wall complexity.
- HardiePlank lap siding: $1.50-$4.00/sf material, $3.50-$6.00/sf labor
- HardiePanel vertical siding: $1.75-$4.50/sf material, $3.00-$5.50/sf labor
- HardieShingle siding: $2.50-$6.00/sf material, $5.00-$8.00/sf labor
- HardieTrim: $1.50-$3.50 per linear foot installed
Material costs vary by texture (smooth vs. cedarmill), color (primed vs. ColorPlus pre-finished), and regional availability.
Key Takeaways
- HardiePlank installed: $5-$10/sq ft total
- Typical whole-house project: $12,000-$30,000
- ColorPlus pre-finished costs $0.50-$1.00/sf more than primed
HardiePlank Plank Sizes and Exposure
HardiePlank comes in 12-foot lengths with widths ranging from 5.25" to 12". The exposure (visible face after overlap) determines how many planks you need per square foot of wall.
| Plank Width | Exposure | Coverage per Plank |
|---|---|---|
| 5.25" | 4" | 4.0 sq ft |
| 6.25" | 5" | 5.0 sq ft |
| 7.25" | 6" | 6.0 sq ft |
| 8.25" | 7" | 7.0 sq ft |
| 9.25" | 8" | 8.0 sq ft |
| 12" | 10.75" | 10.75 sq ft |
The 6.25" width with 5" exposure is the most popular choice for residential lap siding. Wider planks create a more modern look but cost slightly more per square foot installed.
Key Takeaways
- All planks are 12 feet long
- 6.25" width (5" exposure) is most popular
- Wider planks = fewer pieces but higher material cost
Hardie Board vs. Vinyl Siding: When Fiber Cement Wins
Fiber cement siding lasts 30-50 years compared to vinyl's 20-40 years, and it handles heat, moisture, and impact far better than vinyl.
- Fire resistance: Hardie board is non-combustible (Class A fire rating). Vinyl melts.
- Impact resistance: Won't dent or crack from hail or debris the way vinyl does
- Moisture: Fiber cement doesn't absorb water. Vinyl can trap moisture behind it.
- Resale value: Fiber cement recoups 77-85% of cost at sale vs. 68-74% for vinyl
- Paint: Hardie holds paint 2-3x longer than wood. ColorPlus finish is warranted 15 years.
Vinyl is still the right call when budget is the primary constraint. But for homes in harsh climates or areas with wildfire risk, fiber cement is the better long-term investment.
Key Takeaways
- Hardie: 30-50 year lifespan, Class A fire rating
- Vinyl: 20-40 years, cheaper upfront
- Fiber cement recoups 77-85% at resale
Installation Requirements for Fiber Cement Siding
Fiber cement requires blind nailing into studs at 16" on-center with corrosion-resistant siding nails. Improper fastening is the #1 installation failure.
- Fasteners: Stainless steel or hot-dipped galvanized siding nails, 6d or 8d
- Nailing: 1" minimum from edges, 3/8" from top, into studs (not sheathing only)
- Gap at joints: Leave 1/8" gap between butt joints, caulk with paintable sealant
- Housewrap: Required WRB (weather-resistant barrier) behind all fiber cement
- Cutting: Score-and-snap or fiber cement shears. Circular saw with dust collection for straight cuts.
James Hardie requires HardieBacker starter strip at the bottom course. Without it, the warranty can be voided.
Key Takeaways
- Nail into studs at 16" OC with stainless or HDG nails
- Housewrap/WRB required behind all installations
- Starter strip required at bottom course for warranty
How to Use This Calculator
Enter your house dimensions
Input the length and width of your home, or enter the total perimeter directly. Set the wall height and number of stories to calculate gross wall area.
Subtract doors and windows
Enter the number of exterior doors and windows. The calculator deducts 20 sq ft per door and 15 sq ft per window from your total wall area.
Select your Hardie product and plank width
Choose between HardiePlank lap siding, HardiePanel vertical siding, or HardieShingle. For HardiePlank, select the plank width to get exact piece counts based on exposure.
Set your waste factor
Use 10% for straightforward rectangular walls. Bump to 15% for homes with lots of gable ends, angles, dormers, or architectural details that generate more cuts.
Review quantities and costs
See the total number of planks or panels, HardieTrim linear footage, fastener count, and a full material-plus-labor cost breakdown for your project.
Hardie Board Calculation Formulas
Gross Wall Area = Perimeter x Wall Height x Stories
Net Area = Gross Area - (Doors x 20 sq ft) - (Windows x 15 sq ft)
Area with Waste = Net Area x (1 + Waste %)
Planks Needed = Area with Waste / Coverage per Plank
Coverage per Plank = 12 ft x (Exposure in inches / 12)
HardieTrim (LF) = (Corners x Wall Height) + (Windows x 12) + (Doors x 17)Where:
- Exposure
- = Visible face of each plank after overlap (varies by plank width)
- Square
- = 100 square feet of siding area
- HardieTrim
- = Fiber cement trim boards for corners, windows, and door frames
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Frequently Asked Questions
How many HardiePlank boards do I need for my house?
How much does Hardie board siding cost installed?
What is the exposure on HardiePlank siding?
Is Hardie board better than vinyl siding?
How much HardieTrim do I need?
What nails do I use for Hardie board?
Does Hardie board need a weather barrier behind it?
What waste factor should I use for Hardie board?
How many pieces of Hardie board are in a square?
How much Hardie board do I need for a 2,000 sq ft house?
How do contractors price a Hardie board siding job?
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