Custom Window Size Cost Calculator
Price any non-standard replacement window by exact width, height, frame material, and glass package. Get an instant 2026 installed cost estimate for custom-size vinyl, wood, and fiberglass windows — including arched, oversized, and odd-dimension openings.
TL;DR
Custom-size replacement windows cost $450–$1,800 installed in 2026, or roughly $28–$110 per square foot depending on frame material. Non-rectangular shapes add $150–$250 per window. Vinyl is the cheapest custom option; wood and fiberglass cost 2–3× more. Use the calculator to price your exact dimensions in seconds.
Avg. Installed
$850
Per Sq Ft
$28–$110
Lead Time
3–6 wks
Custom Window Size Cost Calculator
Enter exact dimensions for a custom quote
Estimated Installed Cost (15 sq ft each)
$480 – $885
$480 – $885 per window
How the Custom Window Size Cost Calculator Works
Custom windows are quoted by square footage or united inches (width + height). Our calculator converts your exact dimensions to square feet, then applies real 2026 contractor pricing based on frame material, window style, glass package, and shape complexity.
- Enter exact width & height in inches (accurate to the nearest ¼").
- Pick your frame material — vinyl is cheapest, wood is premium.
- Choose window style — casement, picture, arched, or bay all price differently.
- Select a glass package — Low-E argon is the 2026 standard; triple-pane and impact glass add cost.
- Add quantity & shape — non-rectangular custom shapes carry a $175 surcharge.
Custom Window Cost by Size (2026)
Installed pricing for common custom sizes in vinyl, wood, and fiberglass. Includes standard Low-E double-pane glass and professional installation. Regional labor rates may adjust totals by ±20%.
| Custom Size | Vinyl (Installed) | Wood (Installed) | Fiberglass (Installed) |
|---|---|---|---|
| 24" x 36" (6 sq ft) | $450 - $650 | $700 - $1,000 | $620 - $900 |
| 30" x 48" (10 sq ft) | $550 - $780 | $900 - $1,300 | $820 - $1,150 |
| 36" x 60" (15 sq ft) | $680 - $980 | $1,100 - $1,700 | $1,000 - $1,500 |
| 48" x 72" (24 sq ft) | $920 - $1,400 | $1,650 - $2,650 | $1,500 - $2,300 |
| 60" x 84" (35 sq ft) | $1,250 - $1,950 | $2,400 - $3,850 | $2,150 - $3,300 |
| Arched 36" x 72" (custom) | $780 - $1,180 | $1,300 - $2,050 | $1,200 - $1,800 |
Need a stock size instead? Try the Window Installation Cost Calculator or the Vinyl Window Replacement Cost guide.
What Drives Custom Window Size Cost?
- Dimensions – price scales with square footage; oversized units (>40 sq ft) may need reinforced frames.
- Frame material – vinyl is 40–60% cheaper than wood or fiberglass at the same size.
- Shape complexity – arched, circular, and trapezoid units add $150–$250 in tooling.
- Glass package – Low-E, triple-pane, and hurricane impact glass add $60–$240 per unit.
- Installation access – second-story or oversized picture windows may require lift equipment.
- Location & labor – custom install labor averages $250–$500 per window in 2026.
Custom vs. Standard: Cost Difference
Custom sizing typically adds 15–40% over the nearest standard size.
How to Save on Custom-Size Windows
Order in bulk
Buying 5+ custom windows in one order drops per-unit pricing 8–15%.
Round to nearest stock size
If your opening is within 2" of a stock size, reframing can save $200–$400 per window.
Skip triple-pane if not needed
Triple-pane adds $180+ per window; Low-E argon is enough for most climates.
Get 3+ contractor quotes
Labor rates for custom installs vary 30–50% between local pros.
Off-season install
Booking in winter (Nov–Feb) cuts labor 10–20% in most U.S. markets.
Bundle with other work
Combine with siding or trim replacement to share setup costs.
Custom Window Size Cost FAQs
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