Total Siding Needed
1430 sq ft
Squares
14.30
Cost
$7150
Typical Costs:
1300 sq ft
14.30
130 sq ft
$7,150
1 square = 100 sq ft (9.29 sq m)
Note: Does not include labor, trim, or installation materials
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Siding needed = Total wall area - Window/door area + Wastage (10-15%). Measure all walls, subtract openings, and add 10-15% for cuts, corners, and waste.
A square of siding covers 100 square feet. It's a standard measurement for ordering siding. For 1,500 sq ft of walls, you need 15 squares (1,500 ÷ 100 = 15).
Plan for 10-15% waste for standard walls. Add 15-20% for complex designs with many corners, gables, or dormers. More cuts mean more waste.
| Wall Complexity | Waste Factor | Example: 1,500 sq ft net |
|---|---|---|
| Simple (rectangle) | 10% | 1,650 sq ft total |
| Moderate (L-shape) | 12–15% | 1,725 sq ft total |
| Complex (dormers) | 15–20% | 1,800 sq ft total |
| Diagonal pattern | 20–25% | 1,875 sq ft total |
Siding costs vary by material: Vinyl $3-8/sq ft, Fiber cement $5-11/sq ft, Wood $6-12/sq ft, Metal $7-15/sq ft. Installation adds $2-8/sq ft depending on complexity.
| Siding Type | Material Cost/sq ft | Installed Cost/sq ft | Lifespan |
|---|---|---|---|
| Vinyl | $3–$8 | $5–$12 | 20–40 years |
| Fiber Cement | $5–$11 | $8–$16 | 30–50 years |
| Wood (Cedar) | $6–$12 | $9–$18 | 15–30 years |
| Metal (Aluminum) | $7–$15 | $10–$20 | 40–50 years |
| Engineered Wood | $4–$9 | $7–$14 | 30+ years |
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Inputs
Result
Net area = 1,500 - 200 = 1,300 sq ft. Wastage = 1,300 × 0.10 = 130 sq ft. Total = 1,300 + 130 = 1,430 sq ft. Squares = 1,430 / 100 = 14.30. Cost = 1,300 × $5 = $6,500.
Inputs
Result
Net area = 2,400 - 400 = 2,000 sq ft. Wastage = 2,000 × 0.15 = 300 sq ft. Total = 2,000 + 300 = 2,300 sq ft. Squares = 2,300 / 100 = 23.00. Cost = 2,000 × $8 = $16,000.
Net Area = Total Wall Area - Window/Door AreaSubtracts all openings from the total exterior wall area.
Where:
Total Wall Area= Total exterior wall surface in sq ftWindow/Door Area= Combined area of all windows and doors in sq ftTotal = Net Area × (1 + Waste% / 100)Adds waste percentage for cuts, corners, and fitting.
Where:
Waste%= Waste percentage (typically 10-15%)Squares = Total / 100, Cost = Total × Price per Sq FtConverts to roofing-style squares (100 sq ft each) and calculates material cost.
Where:
100= Square feet per squarePrice per Sq Ft= Cost of siding material per square foot1,500–2,000 sq ft of exterior wall area is typical for an average 2,000 sq ft home, with 15–20% of that wall surface occupied by windows and doors that must be subtracted. The net siding area — total walls minus openings — forms the base for all material calculations before waste is added.
Measure each wall face separately: height × width for rectangular walls, plus the triangular gable area (1/2 × base × gable height) for walls under gable roofs. A 40-foot-long wall at 9 feet tall with a 5-foot gable peak = (40 × 9) + (1/2 × 40 × 5) = 360 + 100 = 460 sq ft. Forgetting gable areas underestimates material by 10–15% on a typical home.
Standard window openings average 15 sq ft (3 × 5 ft) and doors average 21 sq ft (3 × 7 ft). A home with 12 windows and 2 doors has approximately 222 sq ft of openings. The paint calculator follows the same wall-minus-openings logic, making these measurements reusable across multiple projects.
Tip: Photograph each wall before measuring and annotate window/door counts. This reference prevents miscounts on complex homes with bump-outs, bay windows, or recessed entries.
$3–$8 per sq ft for vinyl siding makes it the most affordable option, covering a 1,500 sq ft home for $4,500–$12,000 in materials. Fiber cement (HardiePlank) at $5–$11/sq ft costs 40–60% more but lasts 30–50 years versus vinyl’s 20–40 years and resists impact damage, termites, and fire.
Wood siding offers natural beauty at $6–$12/sq ft but demands repainting every 3–5 years ($1,500–$3,000 per cycle) and is vulnerable to rot and insect damage. Engineered wood products like LP SmartSide ($4–$9/sq ft) bridge the gap with a wood-grain appearance, 30+ year warranty, and minimal maintenance.
Metal siding (aluminum or steel) at $7–$15/sq ft is virtually maintenance-free with a 40–50 year lifespan but dents easily and costs the most upfront. For homes in high-wind or hail-prone areas, steel siding’s impact resistance justifies the premium. The total re-siding cost including installation ranges from $7,500 for vinyl on a small home to $30,000+ for fiber cement on a large two-story.
| Material | Material/sq ft | Installed/sq ft | Lifespan | Maintenance |
|---|---|---|---|---|
| Vinyl | $3–$8 | $5–$12 | 20–40 yrs | Wash only |
| Fiber cement | $5–$11 | $8–$16 | 30–50 yrs | Paint every 10+ yrs |
| Wood (cedar) | $6–$12 | $9–$18 | 15–30 yrs | Paint every 3–5 yrs |
| Engineered wood | $4–$9 | $7–$14 | 30+ yrs | Paint every 8–10 yrs |
| Aluminum | $7–$15 | $10–$20 | 40–50 yrs | None |
10% waste is the minimum for siding on simple rectangular walls, but L-shaped homes need 12–15% and complex designs with dormers, bump-outs, or diagonal patterns require 15–25%. Waste comes from cut pieces at corners, windows, and rooflines that cannot be reused elsewhere on the wall.
Trim accessories add 15–25% to the base siding cost and are frequently overlooked in estimates. Inside and outside corner posts ($3–$8 per linear foot), J-channel around windows and doors ($0.50–$1.50/ft), starter strip ($0.50–$1.00/ft), and undersill/finish trim ($0.50–$1.00/ft) are all required for a professional installation.
For a 1,500 sq ft siding job on a home with 8 corners and 14 window/door openings, budget approximately $300–$600 in trim accessories. Corner posts at 9 feet each (8 corners × $5/ft × 9 ft = $360) plus J-channel (300 linear feet at $0.75/ft = $225) totals $585 before starter strip and undersill trim.
A complete siding estimate takes 30–45 minutes to measure and calculate, but saves hundreds of dollars in over-ordering or costly mid-project supply runs. Start with the exterior walls and work systematically around the house, measuring each wall face separately.
Use the square footage calculator for complex wall shapes or break irregular walls into rectangles and triangles. Record all measurements on a sketch of the floor plan viewed from above, labeling each wall with its height, width, and number of openings.
Measure all wall surfaces
Record height × width for each wall. Include gable triangles (1/2 × base × peak height). Total wall area for an average ranch home: 1,200–1,600 sq ft.
Subtract openings
Count all windows (average 15 sq ft each) and doors (average 21 sq ft each). A home with 10 windows and 2 doors: 150 + 42 = 192 sq ft deducted.
Apply waste factor
Multiply net area by 1.10 for simple homes, 1.15 for moderate complexity, or 1.20 for complex rooflines. Example: 1,300 net sq ft × 1.12 = 1,456 sq ft to order.
Convert to squares or panels
Divide by 100 for squares (14.56 squares) or by panel coverage area. Vinyl: 2 boxes per square. Fiber cement: ≈14 planks per square.
Calculate trim and accessories
Measure total corner length, window/door perimeter for J-channel, and bottom perimeter for starter strip. Add 10% waste to trim quantities.
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Last Updated: Mar 26, 2026
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