Radon is a gas you cannot see, smell, or taste, and it can collect inside a house without any hint that it is there. It comes from the natural breakdown of uranium in soil and rock, and it seeps up through cracks, slab joints, and gaps around pipes. Radon testing is the only way to know how much is in your home. This post explains why testing matters across North Carolina, how a test works during a home sale, and what to do with the answer.
Why Radon Testing Matters in North Carolina
Radon levels depend on the ground under a house, and North Carolina’s geology varies from the mountains to the Piedmont to the coast. Two homes on the same street can produce very different results, so the only reliable answer comes from testing the specific house. The North Carolina Radon Program recommends that every home be tested, including homes without basements, and suggests retesting at least every five years, even for homes that already have a mitigation system. Many owners assume radon is a problem only for houses with basements, and that belief leaves a lot of slab and crawlspace homes untested.
How a Radon Test Works During a Home Sale
A radon test for a real estate transaction usually runs for at least 48 hours with a continuous monitor placed in the lowest livable level of the home. Conditions matter, so the house is kept closed during the test, which means windows stay shut and exterior doors are opened only for normal entry and exit. The monitor records readings hour by hour, and the report shows an average along with any unusual swings that could point to tampering or open windows. Professional radon testing gives a buyer a defensible number to use in negotiations, and a seller can use a current result to remove a question before it slows down a deal.
What the Results Mean
The EPA recommends fixing a home when the average level reaches 4 picocuries per liter or higher, and it suggests considering mitigation for results in the range just below that. A result under the action level is good news, but it is a snapshot. Weather, season, and changes to the house can all shift radon levels, which is why retesting every few years is a sensible habit. A result above the action level is not a reason to abandon a purchase. Mitigation systems are common, and they generally work by pulling gas from beneath the foundation and venting it outside the home. The state program notes that mitigation fans are generally covered by a warranty of about five years, and it points homeowners to certified professionals for the work.
Scheduling Your Radon Test With Your Inspection
The easiest way to handle radon testing is to schedule it alongside your home inspection so the two share a visit and a timeline. The monitor goes in at the start of the inspection and comes out two days later, so tell your agent early to leave time before your due diligence period ends. If you are a homeowner who has never tested, start now. A test that confirms a low level gives you peace of mind, and a test that finds a high level gives you time to act.
Sellers and Long-Time Owners
Sellers sometimes avoid radon testing because they fear a high number will cost them a sale. In practice, a known and fixable result is easier to manage than a surprise from a buyer’s test late in the process. A seller who tests early can install a system on their own schedule and hand a buyer a clean report. Long-time owners benefit too. If your last test was many years ago, or you have renovated, finished a basement, or sealed up the house to save on energy bills, your radon levels may have changed.
Ready to find out what is in your air? You can schedule your inspection with ASIST and add professional radon testing to your visit.
Frequently Asked Questions
How long does radon testing take? A typical test for a home sale runs at least 48 hours, and the results are available shortly after the monitor is retrieved.
Do I need radon testing if my home has no basement? Yes. The North Carolina Radon Program recommends testing all home types, including slab and crawlspace homes.
Can a high radon result be fixed? Yes. A certified mitigation professional can install a system that vents the gas from beneath the house to the outdoors.
How often should I retest? The state program suggests retesting at least every five years, and after major changes such as renovations or a new mitigation system.
ASIST serves homeowners, buyers, and sellers throughout North Carolina. Call or schedule online to confirm service in your area.
