Yes, you should test for radon before buying a home. The EPA recommends testing during the inspection period. Elevated radon levels can affect your health and may impact your decision to move forward with the purchase
Why Radon Testing Matters When Buying a Home
Radon is a colorless, odorless gas that can cause lung cancer with long-term exposure. Since levels vary by location—and even from home to home in the same neighborhood—you can’t assume a home is safe without testing.
Testing before you buy ensures:
- You know what you’re walking into
- You can request mitigation as part of the purchase agreement
- You protect yourself and your family from a serious health risk
When to Test for Radon During the Homebuying Process
Radon testing should be done during the home inspection period, before finalizing the sale. This gives you:
- Time to negotiate mitigation with the seller
- The ability to back out of the deal if levels are dangerously high
- A record for future resale or homeowner documentation
Most real estate agents are familiar with this process and may even recommend radon testing in your due diligence period.
Who Pays for Radon Testing?
This can vary by state and negotiation, but generally:
- The buyer requests and pays for the test
- The seller may agree to cover mitigation costs if radon levels are high (usually over 4.0 pCi/L)
- If using a VA or FHA loan, radon testing may be required by your lender
Average radon testing costs range from $150 to $300 depending on the region and method used.
What Happens If Radon Levels Are High?
If radon test results come back above 4.0 pCi/L, the EPA recommends immediate action. As the buyer, you can:
- Request the seller install a mitigation system before closing
- Negotiate a price reduction to cover future mitigation
- Require a re-test after mitigation is completed
Radon mitigation systems usually cost $800–$2,500 and can reduce levels by 99% or more.
Can a Home Still Be Sold With High Radon?
Yes—but most buyers will require mitigation before closing, especially in states like Utah, Colorado, or Illinois where radon risks are higher. If you fall in love with a home that has elevated radon, don’t panic—professional systems are highly effective and last for decades with minimal upkeep.
Final Recommendation
Always test for radon before you buy a home—even if the seller claims the house has already been tested. If a previous test was done years ago or renovations were made since then, a new test is necessary.