Radon Testing Before Buying or Selling a Home

Whether you're buying or selling, radon testing tends to matter for a simple reason: it's one of the few home characteristics with zero visible signs, meaning neither party can assess it by looking at the property, no matter how thorough the walkthrough.

Why Buyers Should Consider Radon Testing

For buyers, testing during the inspection period gives you an actual answer before you're financially committed.

If levels come back elevated, that's information you can act on — negotiate mitigation, a credit, or in some cases reconsider the purchase, depending on your contract terms.

Waiting until after closing removes that leverage entirely; the cost of addressing an issue becomes yours alone.

Why Sellers May Benefit From Testing Early

For sellers, testing proactively — before listing, rather than waiting for a buyer to request it — can actually simplify a transaction.

A clean result becomes a straightforward, verifiable fact you can share early. An elevated result gives you the option to mitigate on your own timeline, rather than under pressure during a buyer's contingency deadline.

How Long Does Radon Testing Take?

Timing-wise, radon testing fits comfortably inside most standard inspection windows: 48 hours of on-site monitoring plus about a day for the report, roughly 3 business days total.

That's fast enough to coordinate around typical contingency periods without needing an extension.

What Illinois Sellers Should Know

It's also worth knowing that Illinois law requires sellers to disclose known radon hazards, but doesn't require testing in the first place — which means a "no known issues" disclosure doesn't necessarily mean the home has actually been tested.

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