Basic
$2,433 – $5,840 each
Fiberglass bay with fixed center and two double-hung flankers, white frames, low-E double-pane glass, insulated seat, cable support, primed boards
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How Much Does Fiberglass Bay Window Cost in Seattle, Washington?
Replace or install one fiberglass bay window unit (three-panel projection), including installation, trim and support.
Fiberglass Bay Window in Seattle, Washington typically costs $2,863 to $6,870 each as of 2026. Prices reflect local labor and material rates. Use our calculator below for a detailed, ZIP-code-adjusted estimate.
Fiberglass Bay Window in Seattle, Washington
$2,863 – $6,870
eachPrices in Seattle are 19.0% higher than the national average for fiberglass bay window.
National average: $2,500 – $6,000 each
What you get at each price level
Standard
$2,863 – $6,870 each
Fiberglass bay with fixed center and two double-hung flankers, tan frames, low-E argon glass, insulated seat, cable support, primed boards
Rendering: BuildX
Find a pro to do thisPremium
$3,578 – $8,588 each
Fiberglass bay with fixed center and two double-hung flankers, dark exterior frames, low-E argon glass, wood-look interior finish, insulated seat, cable support
Rendering: BuildX
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Cost Breakdown in Seattle
| Component | Category | Price Range | Unit |
|---|---|---|---|
| Materials | material | $1,170 – $2,808 | each |
| Labor | labor | $1,173 – $2,814 | each |
| Supplies & Other | supplies | $312 – $749 | each |
| Equipment & Disposal | equipment | $208 – $499 | each |
Prices adjusted for Seattle local market conditions.
Cost Factors in Seattle, Washington
What Affects Pricing
- Materials ($1,125.00-$2,700.00 per unit)
- Labor ($875.00-$2,100.00 per unit)
- Supplies & Other ($300.00-$720.00 per unit)
- Equipment & Disposal ($200.00-$480.00 per unit)
Local Price Adjustments
Material costs4.0% above avg
Labor costs34.0% above avg
Labor costs in Seattle run proportionally higher than materials, which may favor material-heavy solutions.
Frequently Asked Questions
References
- Pella: Bay Window Replacement, pella.com, retrieved Nov 2026
- Windows by Toll: Bay Window Replacement Costs, windowsbytoll.com, retrieved Nov 2026
- EcoWatch: Bay Window Cost 2026, ecowatch.com, retrieved Nov 2026
- Construction wages by metro and rural area, used for the labor adjustment by ZIP code, U.S. Bureau of Labor Statistics, Occupational Employment and Wage Statistics, May 2025
- Regional price parities for goods, used for the materials adjustment by ZIP code, U.S. Bureau of Economic Analysis, 2024
Get Free Estimates in Seattle
Connect with local fiberglass bay window contractors in Seattle for personalized quotes based on your specific project.