Who pays for radon mitigation in an Indiana home sale?
Updated October 24, 2026. This is general information, not legal advice. Your agent or a real estate attorney can advise on your contract.
Short answer: it's negotiated. We found no Indiana law that makes the buyer or the seller pay for a radon system. It usually gets settled after the buyer's inspection, as part of the inspection response.
What Indiana law does require
- Sellers disclose what they know. Sellers of homes with up to four units fill out the Seller's Residential Real Estate Sales Disclosure form (Indiana Code 32-21-5). It asks about known hazards, including radon gas. A seller who never tested may have nothing to disclose. (source)
- Testers and mitigators must be state-certified. Anyone testing for or fixing radon in Indiana homes must be certified by the Indiana Department of Health (Indiana Code 16-41-38). (source)
- A stricter rule has been proposed. Senate Bill 61 (2026) would require sellers to give buyers a radon warning and a state radon guide before signing. As of October 2026 it was still in the Senate Judiciary Committee. (bill status)
How it usually plays out
- The buyer orders a radon test during the inspection period, often with the home inspection.
- If the result is at or above the EPA action level of 4 pCi/L, the buyer asks for a fix in the inspection response.
- The seller can agree to install a system before closing, offer a credit or price cut instead, or refuse. The buyer then decides whether to go ahead.
Tips for each side
| Buyers | Ask for the work to be done by a state-licensed mitigator, with a follow-up test after installation. A credit lets you choose the installer yourself. |
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| Sellers | Testing before you list avoids a surprise mid-deal. If you install a system, keep the paperwork and the post-installation test result for buyers. |
Whichever way it goes, check that the installer holds an active Indiana mitigator license. Browse licensed mitigators by region.