Basic
$8.76 – $16 per sq ft
Polymer slate tiles in one width and a single color over synthetic underlayment, ice barrier at eaves where code requires, matching hip and ridge
How Much Does Synthetic Slate Roof Cost in Seattle, Washington?
Synthetic (polymer or composite) slate roofing installed over underlayment on a pitched roof, materials and labor, per square foot of roof.
Synthetic Slate Roof in Seattle, Washington typically costs $10 to $18 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 Slate Roof in Seattle, Washington
$10 – $18
per sq ftPrices in Seattle are 19.0% higher than the national average for synthetic slate roof.
National average: $9 – $16 per sq ft
What you get at each price level
Standard
$10 – $18 per sq ft
Polymer slate tiles in mixed widths and a two-tone blend, synthetic underlayment, ice-and-water membrane at eaves and valleys
Premium
$13 – $23 per sq ft
Thicker polymer slate in mixed widths with deeper chiseled edges and multi-color blend, high-temp membrane at eaves and valleys
Cost Breakdown in Seattle
| Component | Category | Price Range | Unit |
|---|---|---|---|
| Materials | material | $4.21 – $7.49 | sq ft |
| Labor | labor | $4.22 – $7.50 | sq ft |
| Supplies & Other | supplies | $1.12 – $2 | sq ft |
| Equipment & Disposal | equipment | $0.75 – $1.33 | sq ft |
Prices adjusted for Seattle local market conditions.
Synthetic Slate Roof photo examples
Composite slate tile roof with fading on a low-slope building
Photo: WereItNotSoSimple · CC BY-SA 4.0 · Source
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Cost Factors in Seattle, Washington
What Affects Pricing
- Materials ($4.05-$7.20 per square foot)
- Labor ($3.15-$5.60 per square foot)
- Supplies & Other ($1.08-$1.92 per square foot)
- Equipment & Disposal ($0.72-$1.28 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
- The Roofing Brief: 2026 roofing cost report, theroofingbrief.com, retrieved Nov 2026
- Landmark Roofing: Synthetic slate roofing cost, landmarkroof.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 slate roof contractors in Seattle for personalized quotes based on your specific project.