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Radon Mitigation Cost Calculator (2026)
Radon test came back high? Choose your foundation and options to see what a mitigation system costs in 2026.
| Item | Typical |
|---|---|
| Sub-slab depressurization: fan, pipe, and manometer | $1,300 |
| Seal slab cracks and openings | $300 |
| Professional radon test | $250 |
Installed prices including labor and materials. Your quotes can differ with site conditions.
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Radon mitigation cost: examples
| House | Range | Typical |
|---|---|---|
| Basement, one suction point | $800 – $2,500 | $1,300 |
| Basement, sealing + follow-up test | $1,050 – $3,500 | $1,850 |
| Large basement, two suction points, attic routing | $1,300 – $4,800 | $2,300 |
| Slab home, one point | $800 – $2,500 | $1,300 |
| Crawl space with sealed membrane | $1,650 – $4,400 | $2,750 |
Cost by item
| Item | Unit | Price range | Typical |
|---|---|---|---|
| Sub-slab system (basement or slab) | per system | $800 – $2,500 | $1,300 |
| Sub-membrane system (crawl space) | per system | $1,500 – $4,000 | $2,500 |
| Additional suction point | per point | $300 – $1,500 | $600 |
| Attic pipe routing | per job | $200 – $800 | $400 |
| Seal cracks and openings | per job | $100 – $600 | $300 |
| Professional radon test | per test | $150 – $400 | $250 |
How radon mitigation works
The most common system is sub-slab depressurization. A contractor drills a hole through the basement floor or slab, digs out a small pit underneath, and connects a PVC pipe to a fan that runs continuously. The fan pulls radon from under the house and vents it above the roofline, where it disperses. A U-tube gauge called a manometer shows the system is working.
For crawl spaces with dirt floors, the ground is covered with a sealed plastic membrane and the fan pulls from underneath it. This is similar to crawl space encapsulation, and the two are often done together.
What drives the price
- Foundation type: crawl spaces and mixed foundations cost the most.
- Soil under the slab: tight clay may need extra suction points.
- Pipe route: running through the attic or garage looks cleaner but costs more than an exterior pipe.
- Local rules: some states require licensed mitigators and permits.
Test first, then test again. A home radon test kit costs $15–$50. If results are 4 pCi/L or higher, confirm with a second test before mitigating, and always test after the system is installed.
Frequently asked questions
How much does radon mitigation cost?
Most homes pay $800 – $2,500 for a sub-slab system with one suction point. Crawl spaces cost more because the dirt floor must be sealed under a membrane, typically $1,500 – $4,000.
What radon level requires mitigation?
The EPA recommends fixing your home if radon is 4 picocuries per liter (pCi/L) or higher, and suggests considering it between 2 and 4 pCi/L. There is no known safe level.
How well do radon systems work?
A properly designed active system typically cuts radon levels by 50–99%. Always retest after installation, and again every two years or after major renovations.
How much does it cost to run a radon fan?
Radon fans run continuously and usually use 20–100 watts, which adds roughly $30–$150 a year to an electric bill depending on the fan and local rates. Fans typically last 5–10 years or more.
Can I install a radon system myself?
It is possible, but many states require certified mitigators, and a system that is not balanced correctly may not lower radon enough. Real estate transactions usually need a certified installer.