A radon mitigation system costs $800 to $2,500 in 2026
Most homes land near $1,200 to $1,500. Wisconsin's health department puts the average at $1,000 to $2,000. The usual system is sub slab depressurization: a fan and a pipe that pull radon from under the floor and vent it above the roof. It is usually installed in less than a day.
Cost by home
| Radon test first | $15 to $50 for a DIY kit, $100 to $150 for a pro test. |
|---|---|
| Standard basement system | $800 to $1,500 with one fan and a vent pipe. |
| HomeAdvisor range | $771 to $1,185, about $978. Large or complex homes up to $3,000. |
| Health department average | $1,000 to $2,000. |
| Crawl spaces and slabs | Often more than basements. |
| Wide range | $700 to $4,000 in one guide. |
What pushes a quote up
| Foundation type | Basement, crawl space and slab need different approaches. |
|---|---|
| House size and sections | More foundation sections can need more suction points or fans. |
| Soil | Tight soil can need more work to draw air. |
| Pipe route | Inside or outside the house, and how far to the roof. |
| Starting level | Very high readings may need a stronger system. |
Radon mitigation system cost by region
| Lower cost states | $650 to $2,000. Alabama, Arkansas, Indiana, Iowa, Kansas, Kentucky, Mississippi, Missouri, Oklahoma, Tennessee, West Virginia and most rural areas. |
|---|---|
| Average cost states | $800 to $2,500. Arizona, Florida, Georgia, Michigan, North Carolina, Ohio, Pennsylvania, Texas, Virginia and most mid size cities. |
| Higher cost states | $1,050 to $3,200. California, Connecticut, Hawaii, Massachusetts, New Jersey, New York, Washington, plus big metros such as Chicago, Denver and Washington DC. |
These rows are our estimate. We took the typical national range and adjusted it for local labor costs, which run about 20 percent lower in the cheapest states and about 30 percent higher in the dearest ones. Radon is common in the Midwest, the Northeast and the Appalachian area, but any home can have it.
When to fix it, and who should do it
The EPA action level is 4.0 picocuries per liter. Massachusetts public health guidance says to mitigate above that level and to consider it between 2 and 4, because no level is risk free. See our radon test cost page to test first.
Hire a contractor certified by the National Radon Proficiency Program or the National Radon Safety Board. Both state guides warn that a system installed badly can make radon worse. After it is installed, test again to confirm the level dropped.
Worth it
In December 2025, the EPA published a cost benefit analysis that Wisconsin summarizes: fixing homes above the action level returns up to $15 for every dollar spent. Radon is the leading cause of lung cancer after smoking.
Why this costs more in 2026
A mitigation system is a fan, PVC pipe and a day of labor. PVC is made from oil and gas.
The short version is oil. Diesel passed $6 a gallon on the AAA national average for the first time on September 11, 2026. A year earlier it was about $3.70 (CBS 8 reporting AAA). That lands in trip charges, deliveries and anything made from petroleum. In March 2026, construction input prices were up 4.8 percent on the year, the biggest annual gain since January 2023, according to Associated Builders and Contractors, and the Associated General Contractors measured a 37.8 percent one month jump in diesel, the largest since 1990 (Roofing Contractor, April 2026). Quotes are being held open for shorter periods this year, so ask for the expiry date in writing.
How to judge the quote in your hand
- Test before you buy a system.
- Hire an NRPP or NRSB certified installer.
- Ask for a post install test.
- Ask where the pipe will run.
- Check the fan warranty.
Ways to pay less
- Use a DIY test first. $15 to $50.
- Seal cracks as part of the job.
- Ask the seller to pay in a home sale.
- Get two quotes.
What will this cost me?
Pick the job, your state's cost level and the last detail. The estimate updates as you change them.
An estimate built from published 2026 cost guides. It is not a quote. Get a written quote before work starts.
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Book a free 15 minute callNo pitch deck. We run your audit live on the call.Common questions
How much does a radon mitigation system cost?
$800 to $2,500, with most homes near $1,200 to $1,500.
At what radon level should I mitigate?
At or above 4.0 pCi/L. Consider it between 2 and 4.
How long does radon mitigation take?
Usually less than a day.
Does a radon system run all the time?
Yes. The fan runs continuously.
Is radon mitigation worth it?
The EPA's December 2025 analysis found returns up to $15 per dollar spent for homes above the action level.