Who Pays for Radon Mitigation or Mold Remediation in a Home Sale?

There's no single, universal answer to this — who pays for mitigation or remediation after a radon or mold issue is found during a home sale typically comes down to negotiation between buyer and seller, the specific terms of the purchase contract, and sometimes local market norms.

This isn't something we can state as a fixed rule, and your real estate agent or attorney is the right resource for guidance specific to your transaction.

What Usually Happens When an Issue Is Found?

That said, a few general patterns show up often in practice.

If testing happens during an inspection contingency period and reveals an issue, buyers frequently use that finding as a negotiating point — requesting the seller either complete mitigation/remediation before closing, provide a credit at closing to cover the cost, or adjust the sale price.

Sellers, in turn, may agree to some, all, or none of that request, and the outcome depends heavily on the overall negotiation, market conditions, and how motivated each party is.

What If the Issue Is Found After Closing?

If an issue is discovered after closing, the cost responsibility typically falls to the new owner, unless the seller failed to disclose a known issue they were legally required to disclose — which is a different, more legal question specific to your state's disclosure requirements.

Why Testing Before Closing Matters

This is exactly why testing during the transaction — while there's still room to negotiate — tends to be more useful than testing after the fact, when the negotiating window has closed.

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