Basic
$3.89 – $8.76 per sq ft
2-ply SBS: fastened base sheet plus charcoal granulated cap sheet, torch-applied, new metal edge, base flashings at walls and curbs
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How Much Does Modified Bitumen Roof Cost in Seattle, Washington?
Install a 2-ply modified bitumen (SBS or APP, torch, cold or self-adhered) membrane on a residential or light-commercial low-slope roof.
Modified Bitumen Roof in Seattle, Washington typically costs $4.58 to $10 per sq ft as of 2026. Prices reflect local labor and material rates. Use our calculator below for a detailed, ZIP-code-adjusted estimate.
Modified Bitumen Roof in Seattle, Washington
$4.58 – $10
per sq ftPrices in Seattle are 19.0% higher than the national average for modified bitumen roof.
National average: $4 – $9 per sq ft
What you get at each price level
Standard
$4.58 – $10 per sq ft
2-ply SBS: fastened base sheet plus light gray granulated cap, torch-applied, new metal edge, base flashings at walls and curbs
Rendering: BuildX
Find a pro to do thisPremium
$5.73 – $13 per sq ft
2-ply SBS: heavier base sheet plus white reflective granulated cap over a cover board, torch-applied, new metal edge and base flashings
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Cost Breakdown in Seattle
| Component | Category | Price Range | Unit |
|---|---|---|---|
| Materials | material | $1.87 – $4.21 | sq ft |
| Labor | labor | $1.88 – $4.22 | sq ft |
| Supplies & Other | supplies | $0.50 – $1.12 | sq ft |
| Equipment & Disposal | equipment | $0.33 – $0.75 | sq ft |
Prices adjusted for Seattle local market conditions.
Cost Factors in Seattle, Washington
What Affects Pricing
- Materials ($1.80-$4.05 per square foot)
- Labor ($1.40-$3.15 per square foot)
- Supplies & Other ($4-$9 per square foot)
- Equipment & Disposal ($4-$9 per square foot)
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
- Modified Bitumen Roof: 2026 Cost | The Roofing Brief, The Roofing Brief, retrieved Nov 2026
- Modified Bitumen Roofing Cost | Rooflio, Rooflio, retrieved Nov 2026
- Modified Bitumen Roofing Cost Guide | Well Built Florida, Well Built Florida, retrieved Nov 2026
- Modified Bitumen Roofing Guide | Roofr, Roofr, 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 modified bitumen roof contractors in Seattle for personalized quotes based on your specific project.