Published ranges for do-it-yourself kits, professional tests and mitigation systems. Each row links to where it was published.
Testing
| What | Range | Source |
|---|---|---|
| Short-term DIY kit (2 to 7 days), national | $10 to $40 | Angi, How Much Does Radon Testing Cost?, checked Nov 2, 2026 |
| Long-term DIY kit (90 days or more), national | $25 to $60 | Angi, How Much Does Radon Testing Cost?, checked Nov 2, 2026 |
| Lab fee for a mailed-in kit, national | $10 to $40 | Angi, How Much Does Radon Testing Cost?, checked Nov 2, 2026 |
| Professional test, Spokane (reported May 2021) | $146.29 to $167.15, average $156.72 | ProMatcher, Spokane radon costs, checked Nov 2, 2026 |
| Short-term test during a home purchase, Spokane | $150 to $250 | RadonResources, Spokane, WA, checked Nov 2, 2026 |
| Professional testing, national | $421 average; most pay $145 to $714 | Angi, How Much Does Radon Testing Cost?, checked Nov 2, 2026 |
Mitigation systems
| What | Range | Source |
|---|---|---|
| Mitigation system, Spokane (reported December 2020) | $893.46 to $1,362.49, average $1,127.98 | ProMatcher, Spokane radon costs, checked Nov 2, 2026 |
| Mitigation, Spokane, typical | $1,100 to $2,200 | RadonBase, radon mitigation in Spokane, WA, checked Nov 2, 2026 |
| Crawl space system, Spokane | $1,400 to $2,200 | RadonBase, radon mitigation in Spokane, WA, checked Nov 2, 2026 |
| Second suction point, Spokane | $200 to $300 extra | RadonBase, radon mitigation in Spokane, WA, checked Nov 2, 2026 |
| Finished basement routing, Spokane | $300 to $500 extra | RadonBase, radon mitigation in Spokane, WA, checked Nov 2, 2026 |
| Mitigation, Spokane, another directory | $800 to $2,000; standard basement $1,000 to $1,500 | RadonResources, Spokane, WA, checked Nov 2, 2026 |
| Mitigation system, national | $1,043 average; most pay $805 to $1,326 | Angi, How Much Does a Radon Mitigation System Cost?, checked Nov 2, 2026 |
| Permits, national | $25 to $150 | Angi, How Much Does a Radon Mitigation System Cost?, checked Nov 2, 2026 |
Spokane rows from ProMatcher are older reports (2020 and 2021). They are shown with their dates so you can weigh them against the newer ranges.