Buying a home involves dozens of checklist items — here’s exactly where radon fits into that process.
- Add radon testing to your inspection contingency with a neutral, certified tester.
- Request written disclosure of any prior test results from the seller.
- Ask new-construction builders specifically about RRNC features.
- Keep all test results and mitigation documentation after closing for future reference.
During the Inspection Period
Add radon testing to your inspection contingency if it isn’t already included, using a neutral certified tester with tamper-resistant devices. Request the seller’s disclosure of any prior radon test results in writing, even if a new test is also being conducted.
Questions to Ask the Seller or Builder
For new construction, ask specifically whether radon-resistant new construction (RRNC) features were included — a passive rough-in that makes future mitigation cheap and easy if needed. For existing homes, ask about any past mitigation work, including fan model, installation date, and warranty status if a system already exists.
Documentation to Keep After Closing
Save your inspection-period test result, any seller disclosure documents, and (if applicable) any existing mitigation system’s warranty and installation paperwork. This becomes your baseline for future retesting and eventual resale disclosure.
Fitting the Test Inside the Inspection Window
The constraint most buyers meet late is a calendar one. An inspection contingency is often a single-digit number of days, and a radon measurement is not instant: the device has to sit undisturbed under closed-house conditions, and a mail-in kit then needs laboratory turnaround on top of that. Ordered at the same time as the general inspection, the result usually lands with room to act on it. Ordered after the general inspection report comes back, it can arrive once the contingency has already expired, which leaves you holding a number you can no longer negotiate against.
That timing is also the practical argument for a neutral certified tester rather than a device the seller supplies or places. The party with a financial interest in a low number should not be the party controlling the conditions the measurement runs under.
What a Result Actually Changes in the Deal
A high radon result is one of the more tractable things an inspection can turn up, because the remedy is a known and bounded system rather than an open-ended investigation. That shapes how it gets negotiated. The usual outcomes are a price credit, an escrow holdback that funds the work after closing, a seller-arranged installation completed before closing, or, where the contingency allows it, walking away.
Each carries a trade-off worth knowing before you pick one. A seller-arranged installation puts the system in before you own the house, but the seller is choosing the contractor and has an incentive to choose the cheapest quote. A credit or holdback leaves you selecting the contractor and holding the warranty, at the cost of managing the project yourself shortly after moving in. Ask for the post-installation retest either way, because a system that was installed is not the same thing as a system that was proven to work.
Why the Paperwork Matters Later
Keep the inspection-period result, any seller disclosure, and any existing system’s installation and warranty documents, because eventually you are the seller. EPA’s guidance for home buyers and sellers treats a test as something a buyer can reasonably ask to have repeated: if the last test is not recent, for example within two years, if the home has been renovated or altered since it was tested, or if the buyer plans to live on a lower level of the house than the one that was tested.
Every one of those is a condition you can create yourself between now and your own sale. A dated result, a record of what was changed and when, and proof that a system was installed and verified is what turns your eventual disclosure from an unknown into a documented one.
FAQ
Is radon testing automatically included in a standard home inspection?
Not always — it’s often a separate add-on. Confirm with your inspector or agent whether it’s included or needs to be requested specifically.
Requirements and norms vary by state and local market — confirm specifics with your real estate agent.
These statements have not been evaluated by the Food and Drug Administration. This information is not intended to diagnose, treat, cure, or prevent any disease. Content is for informational purposes only and is not medical advice; consult a qualified healthcare provider before starting any supplement. As an Amazon Associate we earn from qualifying purchases.
