A radon mitigation system is usually a pipe through the slab or a membrane over the crawl space floor, with a fan that vents soil gas outside. The price depends mostly on the foundation, the size of the house, the pipe route and a few add-ons. This guide walks through each driver using the unit prices in the EstiCube radon calculator.
All figures are national planning numbers, not a quote. A real installer designs the system after inspecting the house, so use these to understand a quote, then enter your own estimate in the calculator.
The default system and its parts
The calculator starts from a basement home of 2,000 square feet with a measured level of 8 pCi/L, an exterior pipe run, crack and sump sealing and a post-mitigation test. The total is $1,475.
- The $1,050 base covers the fan, the piping and the first suction point, so it is the figure to compare other quotes against.
- Sealing and the post-mitigation test are separate lines, so you can see whether a quote includes them.
- Every option below is added to or subtracted from this default.
| Line | Cost |
|---|---|
| Mitigation system (fan, piping, first suction point) | $1,050 |
| Crack and sump sealing | $250 |
| Post-mitigation radon test | $175 |
| Total | $1,475 |
How the foundation changes the price
Basement and slab homes use the same base system. A crawl space instead gets a membrane over the earth floor, priced at $1.60 per square foot. With 1,000 square feet of crawl space the membrane is $1,600, and the crawl space total is $3,075. With 1,500 square feet it is $2,400 and the total is $3,875.
A mixed foundation, with a basement or slab plus a crawl space, adds both the membrane and an extra suction point. With the default 2,000 square foot footprint and 1,000 square feet of crawl space, that is $3,450.
House size and extra suction points
The calculator assumes one suction point covers about 2,000 square feet of slab, and each additional point is $375. A 2,500 square foot slab needs two points and costs $1,850. A 4,500 square foot slab needs three and costs $2,225.
A reading above 20 pCi/L also adds a point in the calculator. A 2,000 square foot basement at 25 pCi/L comes to $1,850 against $1,475 at 8 pCi/L. Below 20, the level does not change the price here, so a reading of 3 and a reading of 8 cost the same. A real installer designs from tests of the house, so treat this as a planning rule.
Pipe routing and electrical work
Where the vent pipe runs changes the price. An exterior run is included in the base. An interior run through the house adds $350, for $1,825 on the default job, and a run through the garage or attic adds $225, for $1,700. A dedicated electrical circuit for the fan is an optional $225, so $1,700 on the default job.
Sealing, testing and the minimum job
Sealing is $250 and the post-mitigation test is $175. Both are on by default. Sealing is best thought of as a supplement to a mitigation system rather than a substitute for one, so ask your installer what it is expected to do. Testing again after the fix is the way to confirm the level has come down, which is what the $175 line covers.
The calculator applies a $1,100 minimum job. With sealing and testing switched off, the $1,050 base is raised to $1,100. With the test alone, the total is $1,225.
Running cost and comparing quotes
The fan is meant to run all the time, so ask your installer before switching it off for any reason. The calculator assumes a 70-watt fan running 8,760 hours a year at $0.15 per kilowatt-hour, which is about $92 a year. Your fan and electricity rate will differ.
It is sensible to get more than one estimate, ask for references and use a certified or qualified radon mitigation contractor. NRPP, which describes itself as recognized by the EPA, credentials radon practitioners, so ask whether a contractor holds a current credential. Also ask:
- How many suction points the system uses and why.
- Which pipe route is proposed and whether it passes through living space.
- Whether sealing, an electrical circuit and a post-mitigation test are included.
- What alarm or gauge shows that the system is running.
A fuller worked example
A mixed-foundation home of 2,000 square feet with 1,000 square feet of crawl space, a reading of 25 pCi/L, an interior pipe run and a dedicated circuit comes to $4,400: $1,050 base, $750 for two extra suction points, $350 interior routing, $1,600 membrane, $250 sealing, $225 electrical and $175 post-test.
To reproduce it, choose the mixed foundation, enter 1,000 square feet of crawl space and a level of 25, pick the interior pipe run and tick the dedicated circuit. That is $2,925 more than the $1,475 default, and the calculator shows each line so you can see where the difference comes from.
Run your numbers with the Radon Mitigation Cost Calculator
Change any unit price to match your quote and see every line item add up. It is free, needs no sign-up and works on your phone.
Open the Radon calculatorFrequently asked questions
How much does radon mitigation cost?
In this calculator the default job is $1,475: a $1,050 system, $250 of sealing and a $175 post-mitigation test. A crawl space, extra suction points or a longer pipe route raise it. Your local quote may differ.
Does a higher radon level cost more to fix?
Only above 20 pCi/L in this calculator, where an extra $375 suction point is added. Below that, the level does not change the price. Real installers design from tests of the house.
How much does it cost to run a radon fan?
The calculator estimates about $92 a year, from a 70-watt fan running all year at $0.15 per kilowatt-hour. The fan is designed to run continuously.
Is sealing cracks enough?
Sealing is generally treated as a supplement to a mitigation system, not a replacement. In the calculator it is a $250 add-on to the system, so ask your installer what it is expected to do.
Should I retest after mitigation?
Yes. Testing again after the fix is how you confirm the level has come down, and the calculator includes a $175 post-mitigation test by default. The companion guide on radon levels explains the EPA's action levels.
Sources
- Radon — U.S. Environmental Protection Agency
- What is EPA's Action Level for Radon and What Does it Mean? — U.S. Environmental Protection Agency
- National Radon Proficiency Program — NRPP
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