How Much Does Radon Mitigation Cost in Seattle, WA?
Seattle pricing is 30% above the national average. Updated for 2026.
Based on local labor rates, oceanic climate conditions, and Seattle's tech-aerospace-trade economy.See our methodology
Radon Mitigation Pricing in Seattle, WA
Seattle is a high-cost market where radon mitigation runs about 30% above the national average. The city's tech-aerospace-trade economy supports higher wages, which translates to elevated contractor rates. With a population of 735K, competition among providers exists but demand keeps prices firm.
Local climate plays a direct role in radon mitigation costs here. Persistent rain creates moisture management challenges for roofing, siding, and foundations; mild temperatures reduce HVAC extremes.
Market-specific factors matter in Seattle: tech economy drives premium pricing; green building requirements may add cost; high minimum wage affects labor rates.
Seattle has strict permitting requirements. Budget an additional 5-15% for permits, inspections, and code compliance when planning your radon mitigation project. Licensed contractors familiar with local codes can navigate this process efficiently.
Seattle vs National Average
What Affects Radon Mitigation Cost in Seattle?
Foundation
Basement: $800-$1,500. Slab-on-grade: $1,000-$1,800. Crawl space: $1,200-$2,500. Multiple foundation types: $1,500-$2,500
System
Sub-slab depressurization: $800-$1,500. Sub-membrane: $1,200-$2,000. Heat recovery ventilator: $1,500-$2,500
Seattle Market Conditions
tech economy drives premium pricing; green building requirements may add cost; high minimum wage affects labor rates
Local Climate Impact
persistent rain creates moisture management challenges for roofing, siding, and foundations; mild temperatures reduce HVAC extremes
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Tips to Save on Radon Mitigation in Seattle
- 1.Start with a radon test kit ($15-$40) before hiring a pro
- 2.Sub-slab depressurization is the most cost-effective method
- 3.Some states offer tax credits or subsidies for radon mitigation
- 4.DIY-friendly test kits are available at hardware stores
- 5.In Seattle, verify your contractor handles local permits — the permitting process here is more involved than average and DIY permit applications can cause delays.
📈 Radon Mitigation in Seattle Cost Trends (2020–2024)
Prices have increased +17.7% over the last 5 years
| Year | National Avg | YoY Change |
|---|---|---|
| 2020 | $1,325 | — |
| 2021 | $1,381 | +4.2% |
| 2022 | $1,471 | +6.5% |
| 2023 | $1,512 | +2.8% |
| 2024 | $1,560 | +3.2% |
Based on national averages adjusted for annual inflation. Actual costs vary by location and project scope.
💬 What Did You Pay?
Real costs reported by homeowners for Radon Mitigation in Seattle
Recent Reports
Frequently Asked Questions
What radon level requires mitigation?
The EPA recommends mitigation if radon levels are at or above 4 pCi/L (picocuries per liter). Many experts suggest considering mitigation at 2 pCi/L.
Why does radon mitigation cost different in Seattle than other cities?
Seattle's costs reflect local labor rates driven by the tech-aerospace-trade economy, oceanic climate conditions that affect materials and scheduling, and strict permitting requirements. The expensive labor market also influences competitive pricing.
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