Do Home Buyers Need Radon or Mold Testing Before Closing?

Whether radon or mold testing is required as part of a home purchase depends on your specific transaction, lender, and local requirements — this isn't something we can state as a blanket legal rule, and it's worth confirming with your real estate agent or attorney for your specific situation.

Why Many Home Buyers Choose to Test

That said, both tests are extremely common, and for good reason. A home can look completely move-in ready and still have elevated radon levels or a mold issue that isn't visible during a standard walkthrough — remember, radon has zero visible or detectable signs, and mold can be present behind walls or under flooring with no outward indication.

The Advantage of Testing Before Closing

Many buyers choose to test during the inspection period specifically because it's one of the few windows where you have negotiating leverage if something is found — after closing, any remediation or mitigation cost is entirely on you.

Testing during the transaction gives you the option to request repairs, a price adjustment, or in some cases walk away, depending on your contract terms.

How Long Do the Tests Take?

From a timing perspective, both tests are fast enough to fit inside a typical inspection contingency window: radon testing takes about 48 hours on-site plus roughly a day for the report, and mold testing takes about 30 minutes on-site plus about 3 business days total for lab results and the written report.

Schedule a radon or mold test today with DezAir Quality Testing online at dezairqualitytesting.com.