Buying or selling
Radon when buying or selling a home in Butler County
A radon test is one of the most common inspections in a Pennsylvania home sale. Here's how the test works, what sellers disclose, and what happens if the number comes back high.
$800–$1,200 typical system in PA
Pennsylvania DEP's range. Free quote, no obligation, from an installer certified by the PA Department of Environmental Protection.
What does your test result mean?
Enter the radon level from your test report.
General guidance from the EPA and Pennsylvania DEP, not a substitute for a certified professional's assessment.
The radon test during a sale
Buyers usually order a radon test during the inspection period in the agreement of sale. Most real-estate tests are short-term tests that run for at least two days. Anyone testing someone else's home for pay in Pennsylvania must be certified by DEP.
Keep the house closed
For short tests, the EPA calls for closed-house conditions: windows and outside doors closed for 12 hours before and during the test, apart from normal coming and going. Don't run whole-house fans. Sellers who open windows or move the test device can cause problems later.
What sellers disclose
Pennsylvania's seller property disclosure asks what the seller knows about radon tests and their results, including tests done by earlier buyers. If a system is already installed, have the paperwork and most recent test ready.
If the result is 4.0 pCi/L or higher
- Seller installs a system before closing, using a DEP-certified mitigator, and provides a follow-up test.
- Credit or price reduction so the buyer can have a system installed after closing.
- Buyer handles it after closing. A typical system runs $800 to $1,200, according to PA DEP.
After a system is installed, the EPA recommends a follow-up test no sooner than 24 hours and within 30 days of the system starting up.
Working against a closing date?
Put your closing date in the quote form below. Most systems are installed in a single day, and installers often schedule real-estate jobs first.
Sources: U.S. EPA radon guidance · PA DEP, January 2026 · Pennsylvania Association of Realtors
Who you'll talk to
An independent referral to a certified installer
Butler County Radon Help is a referral service, not an installer. When you request a quote, we pass it to a radon mitigation company certified by the Pennsylvania Department of Environmental Protection that serves Butler County. The quote is free, and you're never obligated to hire anyone.
Check any company yourself
Look it up in the PA DEP radon services directory, or call DEP at 1-800-23-RADON.
Service area
Serving all of Butler County
- Butler
- Cranberry Township
- Zelienople
- Harmony
- Evans City
- Mars
- Valencia
- Seven Fields
- Saxonburg
- Slippery Rock
- Chicora
- Prospect
- Adams Township
- Jackson Township
- Center Township
- Penn Township
Good to know
Your radon questions, answered.
Straight answers from EPA and Pennsylvania DEP guidance.
More guides: Radon mitigation cost · Radon when buying or selling a home
Does Pennsylvania require a radon test to sell a house?
No. State law doesn't require a test, but sellers must disclose what they know about past tests, and many buyers order one.
Who pays for the radon test?
Usually the buyer, as part of home inspections. Who pays for a fix is negotiated in the sale.
Can the house pass with an existing radon system?
Yes, if a test shows the level is below 4.0 pCi/L. Make sure the fan is running and the gauge on the pipe shows suction.
How fast can a system be installed before closing?
Most single-family homes are done in one day once the work is scheduled.
Free quote
Ready to lower your radon?
Tell us a little about your home. A DEP-certified installer serving Butler County will follow up with you.
- No cost to request a quote
- Shared with one certified installer, not sold to a list
- Mention a closing date and it's flagged as urgent