Your result
Enter your numbers and press the button.
Mitigation prices
The University of Georgia Extension, citing EPA, reports an average mitigation cost of about $1,500 and a range of $900–$3,000, depending on the house, the radon level, and local labor and material costs.
| Item | Typical cost |
|---|---|
| Mitigation system | $900–$3,000 |
| Average | $1,500 |
Basement finishing and radon
Sub-slab depressurization pulls air from under the slab with a fan and vents it above the roof. In a basement you are about to finish, plan where the pipe will run and leave access to the fan and gauge. Test again after the work is done.
Moisture comes first
Finishing materials hide water problems until they become mold problems. Before framing, tape a 2 × 2 ft sheet of plastic to the slab and to a wall for two days: water under it means moisture is coming through the concrete; water on top means humid air is condensing. The first calls for drainage or sealing, the second for dehumidification. Keep a hygrometer in the finished space afterward and aim for the EPA's 30%–50% range.
- Extend downspouts several feet from the foundation.
- Slope soil away from the house.
- Use materials that tolerate moisture below grade: foam board, treated bottom plates, vinyl plank.
- Leave access to the sump pit, the radon fan and the main water shutoff.
Where basement moisture comes from
| Source | Sign | Usual fix |
|---|---|---|
| Rain and snowmelt | Wet floor edges after storms | Gutters, downspout extensions, grading |
| Groundwater | Water through cracks or under walls | Interior drain and sump pump |
| Humid outdoor air | Musty smell, sweating pipes in summer | Dehumidifier, keep windows shut on humid days |
| Vapor through concrete | Damp under a plastic test sheet | Vapor barrier, foam board, sealer |
| Plumbing and appliances | Local stains | Repair leaks, vent the dryer outside |
How a mitigation system works
- The installer drills a suction hole through the slab and digs a small pit in the soil beneath.
- A sealed pipe runs from the pit to a fan, usually in the attic or outside.
- The fan keeps the soil under the slab at lower pressure than the room, so soil gas goes up the pipe instead of into the house.
- Cracks and openings in the slab are sealed and a gauge on the pipe shows the system is running.
- A follow-up test confirms the result.
What drives the price
- Number of suction points needed to reach the whole slab.
- Pipe route: inside through closets and the attic, or up an outside wall.
- Crawl spaces that need a sealed membrane.
- Finished ceilings and walls that must be opened.
Common questions
How much does radon mitigation cost?
About $1,500 on average, with most systems between $900 and $3,000.
Related calculators
Sources
- https://fieldreport.caes.uga.edu/publications/C1065/
- https://www.dep.pa.gov/OurCommonWealth/Pages/Article.aspx?post=89