How much does a radon test cost?
A radon test costs $150 to $250 from a professional in 2026. What changes your price is below.
A do it yourself kit is $15 to $50 including the lab fee. If the result is at or above the EPA action level of 4 pCi/L, a mitigation system is $800 to $2,500 installed.
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Is this price fair?
A fair price is $15 to $50.
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Middle of the range: $35
What you are paying for
How we calculate this
Prices are for the United States in 2026 from published cost guides, checked September 2026. This is an estimate, not a quote.
Cost by job
| DIY short term kit (2 to 7 days, lab fee included) | $15 to $50 |
|---|---|
| DIY long term kit (90 days) | $25 to $60 |
| Professional short term test (48 hour monitor) | $150 to $250 |
| Professional continuous monitor with report | $150 to $300 |
| Radon test added to a home inspection | $100 to $200 |
| Retest after mitigation | $100 to $200 |
| Radon in water test (private well) | $50 to $150 |
| Mitigation system installed | $800 to $2,500 |
What to know before you book
| The action level | The EPA says fix the home at 4 pCi/L or higher, and consider fixing at 2 to 4. About 1 in 15 US homes tests above 4. It is the second leading cause of lung cancer after smoking. |
|---|---|
| Where it is worst | Iowa, Pennsylvania, Ohio and much of the upper Midwest and Appalachia have the highest average levels. Basements and slab homes both can have it. Florida and coastal Texas are low, but not zero. |
| Short vs long term | A 48 hour test is what a home purchase uses because of the deadline. A 90 day test is more accurate because levels swing with the seasons. If you already own the home, do the long one. |
| Testing rules during a sale | Windows closed for 12 hours before and during the test. The tester will tamper seal the monitor. A test run with the windows open is worthless, which is why buyers pay a professional instead of trusting the seller's kit. |
| Mitigation | A sub slab depressurization system, a pipe and a fan that vents radon from under the foundation, is $800 to $2,500 depending on the foundation. Most sellers pay for it when a buyer's test comes back high. |
| Disclosure | Many states require sellers to disclose known radon results. Few require testing. If the seller has a result over two years old, test again. |
Why it costs what it costs
The test itself is a small box that sits on a shelf. What you pay a professional for is a tamper proof monitor, a chain of custody the lender or seller cannot argue with, and a report that holds up when you ask for a $1,500 mitigation credit. A $20 kit is fine for your own home. For a purchase, the $200 test is the one that gets the seller to pay.
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Common questions
How much does a radon test cost?
$150 to $250 for a professional test in 2026, or $15 to $50 for a DIY kit with the lab fee.
Is a radon test included in a home inspection?
No. It is an add on, usually $100 to $200 when the inspector does it during the same visit.
What radon level is unsafe?
The EPA action level is 4 pCi/L. Fix the home at or above that, and consider fixing between 2 and 4.
How much does radon mitigation cost?
$800 to $2,500 installed for a standard sub slab system.
How long does a radon test take?
48 hours minimum for a short term test. 90 days for a long term test, which is more accurate.
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