Test before you list
A pre-listing radon test costs very little and changes the dynamic entirely. If the result is low, you have documentation that removes a common inspection concern. If it is elevated, you can mitigate on your own schedule, get competitive pricing, and market the home with a system already installed and verified — instead of negotiating under a deadline with a buyer who now has leverage.
Disclosure
If you know your home has elevated radon, disclose it. Disclosure requirements vary and this is not legal advice, but concealment of a known condition is the risk you do not want to carry into a closing. Disclosing an elevated result alongside a completed mitigation and a verification test is a strong position, not a weak one.
Timeline if radon comes up mid-transaction
Radon timeline inside a home sale
Typical scheduling. Actual dates depend on contractor availability and your contract terms.
Order the radon test at the same time as the general home inspection. Closed-house conditions start 12 hours before the device is placed.
The full sequence — test, mitigate, verify — typically fits inside a week when scheduled promptly. The failure mode is delay: waiting three days to call, then a week to schedule, then discovering the verification test still needs 48 hours.
Your options mid-transaction
| Option | Trade-off |
|---|---|
| Mitigate before closing | Most reassuring to the buyer; you choose the contractor |
| Offer a credit | Fast and simple; buyer controls the work |
| Split the cost | Common compromise on marginal results |
| Decline | Viable in a strong market; may cost the buyer |
How to present a mitigated home
- Keep the pre-mitigation result, system description, and post-mitigation verification together in one packet.
- Point out the manometer and explain what it shows.
- Note the fan's install date and location.
- List the system in the disclosure as a completed improvement, not an unresolved issue.
Related services
Keep learning
- Buying a Home With Radon: A Buyer's GuideAn elevated radon result is one of the most fixable findings in a home inspection. Handled early, it rarely threatens a closing.
- What Radon Mitigation Costs — and What Drives the PriceRadon mitigation is priced on how hard it is to move air under your specific foundation — not on square footage. Here is what each line item actually represents.