What radon mitigation really costs.
Every price band on this site traces to a published source: EPA cost documents, EIA electricity tables and state radon program pages. No lead forms, no contractor markups hidden in the number.
Three ways in, no wrong order.
- Installed bands by system type
- Testing, permits, fan replacement
- What quotes leave out
- Basement, slab, crawl space, sump
- Active vs passive depressurization
- What each one actually does
- Zone 1, 2 and 3 by county
- Predicted averages, not house tests
- What your zone means for cost
Fresh from the desk
Does Home Insurance Cover Radon Mitigation?
Standard homeowners insurance usually does not pay for radon mitigation. Learn what policies typically cover, typical costs, and when testing makes sense.
Read the guide →
Radon Mitigation Cost by Foundation Type: 2026 Price Guide
Compare radon mitigation system costs for slab, basement, crawl space, and block wall foundations, plus fans, permits, and testing.
Read the guide →
Crawl Space Radon Mitigation Cost: What to Expect
Detailed breakdown of crawl space radon mitigation costs, system types, and ongoing expenses for US homeowners.
Read the guide →The four we hear first.
How much does a radon mitigation system cost?
The EPA publishes an installed range of $800–$2,500 for a fan-based sub-slab depressurization system in an existing home, with many installs landing near $1,200. Crawl-space sub-membrane systems and multi-foundation homes run higher; passive systems in new construction run lower.
What is the EPA action level for radon?
4 picocuries per liter (pCi/L) of air. EPA says fix at 4 pCi/L or above, and consider fixing between 2 and 4 pCi/L because there is no safe level of radon. Mitigation typically brings a home below 2 pCi/L.
How much does radon testing cost?
A do-it-yourself short-term kit with lab analysis runs $20–$45. Long-term kits run $20–$50 and give a better picture of a year-round average. A certified professional measurement runs about $150–$250, and consumer continuous monitors cost $100–$200.
What does a radon fan cost to run?
A mitigation fan draws under 90 watts — usually 60–90 W. At the August 2026 US average residential price of 18.16 cents per kWh (EIA), an 80-watt fan running all year uses about 701 kWh and costs roughly $127 a year. EPA budgets $50–$200 a year for operating costs.