Basic
$0.96 – $2.43 per sq ft
Lightweight woven synthetic underlayment, one layer with printed lap lines, fastened with plastic cap nails
How Much Does Synthetic Roof Underlayment Cost in Seattle, Washington?
Install synthetic roof underlayment on a roof deck, material and labor (as a reroof line item).
Synthetic Roof Underlayment in Seattle, Washington typically costs $1.13 to $2.86 per sq ft as of 2026. Prices reflect local labor and material rates. Use our calculator below for a detailed, ZIP-code-adjusted estimate.
Synthetic Roof Underlayment in Seattle, Washington
$1.13 – $2.86
per sq ftPrices in Seattle are 19.0% higher than the national average for synthetic roof underlayment.
National average: $1 – $2.50 per sq ft
What you get at each price level
Standard
$1.13 – $2.86 per sq ft
Mid-weight synthetic underlayment with a walkable non-slip surface, cap nails at listed spacing, extra lap at valleys
Premium
$1.41 – $3.58 per sq ft
Heavier high-tear-strength synthetic with non-slip coating, tighter cap-nail spacing, wider laps at eaves, valleys and rakes
Cost Breakdown in Seattle
| Component | Category | Price Range | Unit |
|---|---|---|---|
| Materials | material | $0.52 – $1.16 | sq ft |
| Labor | labor | $0.40 – $1.18 | sq ft |
| Supplies & Other | supplies | $0.10 – $0.31 | sq ft |
| Equipment & Disposal | equipment | $0.10 – $0.21 | sq ft |
Prices adjusted for Seattle local market conditions.
Cost Factors in Seattle, Washington
What Affects Pricing
- Materials ($0.50-$1.12 per square foot)
- Labor ($0.30-$0.88 per square foot)
- Supplies & Other ($0.10-$0.30 per square foot)
- Equipment & Disposal ($0.10-$0.20 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
- CyanBuild: Underlayment cost guide, cyanbuild.com, retrieved Nov 2026
- RealCostIQ: Roof underlayment calculator, realcostiq.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 synthetic roof underlayment contractors in Seattle for personalized quotes based on your specific project.