Basic
$0.29 – $0.68 per sq ft
Soft wash with a standard algaecide mix in one application, loose moss brushed off, plantings pre-wetted and rinsed
Photo: S.Buckalew · CC BY-SA 3.0 · Source
How Much Does Clean a Roof Cost in Seattle, Washington?
Soft-wash cleaning of a residential asphalt, metal or tile roof to remove algae, moss and stains, priced per square foot of roof surface.
Clean a Roof in Seattle, Washington typically costs $0.34 to $0.80 per sq ft as of 2026. Prices reflect local labor and material rates. Use our calculator below for a detailed, ZIP-code-adjusted estimate.
Clean a Roof in Seattle, Washington
$0.34 – $0.80
per sq ftPrices in Seattle are 19.0% higher than the national average for clean a roof.
National average: $0.30 – $0.70 per sq ft
What you get at each price level
Standard
$0.34 – $0.80 per sq ft
Soft wash with mix strength matched to the roof material, surfactant for dwell, loose moss removed, plantings wetted before and rinsed after
Premium
$0.43 – $1 per sq ft
Soft wash with longer dwell and a second spot application on heavy streaks, moss hand-removed, plants covered, eaves and downspouts rinsed
Cost Breakdown in Seattle
| Component | Category | Price Range | Unit |
|---|---|---|---|
| Materials | material | $0.14 – $0.32 | sq ft |
| Labor | labor | $0.13 – $0.34 | sq ft |
| Supplies & Other | supplies | $0.04 – $0.08 | sq ft |
| Equipment & Disposal | equipment | $0.03 – $0.06 | sq ft |
Prices adjusted for Seattle local market conditions.
Clean a Roof photo examples
Asphalt shingle roof partly cleaned, light patch among dark stained shingles
Photo: S.Buckalew · CC BY-SA 3.0 · Source
Find a pro to do thisMetal shingle roof being cleaned with a pole-mounted brush, leaving a lighter area
Photo: Stormsinger54 · CC BY-SA 4.0 · Source
Find a pro to do this
Cost Factors in Seattle, Washington
What Affects Pricing
- Materials ($0.13-$0.31 per square foot)
- Labor ($0.10-$0.25 per square foot)
- Supplies & Other ($0.04-$0.08 per square foot)
- Equipment & Disposal ($0.03-$0.06 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: Soft wash roof cleaning cost 2026, theroofingbrief.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 clean a roof contractors in Seattle for personalized quotes based on your specific project.