Home hazardsGuide 5 of 8
Radon mitigation cost: what a system costs to install and run
From Below the Sill · belowthesill.com/radon/mitigation-cost/
Short answer
Radon mitigation cost is usually about $800 to $1,300 for a simple sub-slab system. Crawl spaces, finished basements, several suction points or a hard pipe route can push it to $2,000–$5,000 or more. Running the fan adds roughly $65 to $145 a year (about $5 to $12 a month) in electricity at the national average rate. Prices checked October 2026.
On this page
How much does radon mitigation cost?
Published figures for a simple system are close to each other:
| Source | Range | Covers | Updated |
|---|---|---|---|
| Virginia Department of Health | $800–$1,200 for a typical sub-slab system; $2,000 or more for crawl spaces or homes with several sections | Virginia | Dec. 2025 |
| Angi | Average $1,000; most $800–$1,300; up to $2,500 for larger or more complex homes | U.S. | Apr. 2026 |
| HomeAdvisor | Average $1,028; typical $786–$1,274 | U.S. | June 2026 |
| Minnesota Department of Health | $1,500–$3,000 | Minnesota | Oct. 2024 |
Radon mitigation system cost by scope
Those figures mostly describe fairly basic jobs, and some houses need a lot more work. Here are the ranges we use for first quotes, by scope:
| Scope | Quote range (USD) | What changes it |
|---|---|---|
| Simple, easy-to-reach sub-slab system | $900–$1,800 | Pipe route, electrical work and finishing |
| Sub-slab with two or more suction points, or a finished basement | $1,800–$3,500+ | Poor airflow under the slab, interior work and repairs |
| Crawl space with a new membrane and suction | $2,000–$4,500+ | Area, height, ground prep, sealing and drainage |
| Mixed foundations or several sections | $2,500–$5,000+ | Separate circuits, fans, access and pipe routes |
Robert Stulpt’s quoting ranges, 2026. Prices can come in below or above these depending on the state, the house and the install.
Don’t know your level yet? Start with how to test for radon. When you get a quote, check whether it includes electrical work, permits, ground prep, the post-installation test and any moisture work that has to come first. I wouldn’t expect any of those to be included unless the quote says so.
What changes the price
Most of the time, the fan isn’t what drives the price. Extra suction points, material under the slab that restricts airflow, a difficult pipe route and a finished basement are what push it up.
A crawl space with rocks, pipes and posts and very little room to work can take many hours. If water is getting in, you first need to sort out what drainage work is needed. Electrical work and going through the roof can also be extra line items.
| Item | USD |
|---|---|
| Fan, pipe, fittings, sealants and gauge | $425 |
| Site visit, drilling and labor | $1,050 |
| Electrical hookup and finishing | $375 |
| Total | $1,850 |
Monthly cost of a radon mitigation system: electricity and maintenance
Since a radon fan runs nonstop, it’s worth knowing what it costs to run. For a basic house, a fan that actually draws about 40 to 90 watts is reasonable. Some homes need less and some need over 100 watts. Use the fan’s real running wattage, not just the catalog number, to work out your cost.
Example (hypothetical): a 65-watt fan running 24 hours a day uses 0.065 × 24 × 365 = 569.4 kWh a year. At the U.S. average residential rate of 18.16 cents per kWh (EIA, August 2026), that’s about $103 a year, or roughly $8.60 a month. The same math gives about $64 for a 40-watt fan and about $143 for a 90-watt fan. Your rate may be higher or lower.
| Fan draw | kWh per year | Cost per year at 18.16¢/kWh |
|---|---|---|
| 40 W | 350.4 | about $64 |
| 65 W | 569.4 | about $103 |
| 90 W | 788.4 | about $143 |
The EPA notes that most systems also pull out some heated or cooled air, which can raise your heating and cooling bill a little. It doesn’t give a figure.
Other costs over time:
- Fan replacement: about $150 to $350, typically every 5 to 10 years (Angi, April 2026). See radon fan replacement.
- Retesting: the EPA recommends testing at least every two years with a system in place. A short-term kit costs about $10 to $40 (Angi, September 2026).
How to compare radon mitigation quotes
- Credentials. Check what your state requires. Virginia requires NRPP or NRSB certification; Pennsylvania and Ohio certify or license mitigators themselves. Your state radon program can tell you.
- What’s included. Electrical, permits, membrane, sealing, finishing and the post-installation test.
- A result guarantee. It’s common for contractors to offer some promise of getting below 4 pCi/L, but read it. Get in writing what level it covers, in which areas, how it will be tested, for how long, and what adjustments are included if the follow-up test comes back high. A result guarantee is not the same as the fan’s warranty. And if someone later changes the foundation, unplugs the fan or alters the pipes, the terms will need another look.
- An independent test afterward. The EPA suggests one, to avoid a conflict of interest.
See how radon mitigation systems work to know what you’re comparing. If your quote includes crawl space work, our crawl space encapsulation cost guide covers the moisture side.
Does homeowners insurance cover radon mitigation?
Normally no. Routine radon testing and a mitigation system aren’t covered by a homeowners policy, because high radon is a condition of the house and the soil under it, not damage from a sudden event. Assume you’ll pay for testing and mitigation yourself.
Where the cost often does get shared is in a home sale. If a test during the purchase comes back high, the buyer and seller can negotiate who pays for the system, or for a retest, as part of the deal; there’s no general rule that the seller pays. If you’re buying, put the test, and what happens if it’s high, in writing before closing.
Our radon testing guide explains how to get a result you can rely on before you negotiate. Insurance information reviewed by Nathaniel Calderbrook.
Who wrote this guide
Written by
Licensed contractor in Virginia who specializes in moisture, water, mold and radon.
- Five IICRC certifications, including Building Moisture Inspection and Mold Remediation Specialist
- Virginia contractor license, Residential Building Contractor (RBC) class
- NRPP certified Radon Measurement Professional (2018) and Radon Mitigation Specialist (2020)
- EPA RRP Certified Renovator (lead-safe renovation)
Below the Sill is independent and educational. We don’t provide inspections, engineering or repair services, contractor referrals or estimates.
Share this guide
All 8 guides in Home hazards
Home hazards topic pageA seasonal check, by email
Four emails a year, before each season changes: what to look at in your basement, crawl space and yard, and the guides we’ve published since the last one.
Sources
- Virginia Department of Health, Radon Testing and Mitigation (opens in a new tab) (updated Dec. 17, 2025). Checked October 2026.
- Angi, How Much Does It Cost to Remediate Radon? (opens in a new tab) (updated Apr. 6, 2026). Checked October 2026.
- Angi, How Much Does Radon Testing Cost? (opens in a new tab) (updated Sept. 23, 2026). Checked October 2026.
- HomeAdvisor, Radon Mitigation System Cost (opens in a new tab) (updated June 19, 2026). Checked October 2026.
- Minnesota Department of Health, Radon Mitigation System (opens in a new tab) (updated Oct. 3, 2024). Checked October 2026.
- U.S. Energy Information Administration, Electricity Monthly Update (opens in a new tab) (released Oct. 23, 2026). Checked October 2026.
- U.S. EPA, Consumer’s Guide to Radon Reduction, EPA 402/K-10/005 (opens in a new tab). Checked October 2026.
Prices checked October 2026. The quoting ranges and the Kentucky breakdown are Robert Stulpt’s; Below the Sill doesn’t send him customers.