Radon comes up in a lot of Lawrence home sales. Douglas County is in EPA Radon Zone 1, and every Kansas residential sales contract must include a radon notice saying KDHE recommends that buyers have an indoor radon test before purchasing or moving in. Here is how testing usually fits into a transaction. This is general information, not legal or real estate advice. Your contract and your agent control the details.
A valid test needs at least 48 hours of measurement, plus 12 hours of closed-house conditions beforehand, plus time to schedule placement and pickup. If your inspection window is short, order the radon test as soon as the contract is signed, ideally alongside the general home inspection. If the result is high, you still need time to get a mitigation quote and negotiate before your deadline.
The EPA suggests the contract spell out where the test will be placed, who will conduct it, what type of test it is, when it happens, how results and costs are shared, and when any mitigation will be done and who pays for it.
Buyers commonly order the radon test with their other inspections, but who pays is whatever the contract says. If the result is 4.0 pCi/L or higher, KDHE recommends the buyer negotiate with the seller for a mitigation system that meets the state adopted standards. Common outcomes include the seller having a system installed before closing, a credit or price reduction so the buyer can install one after closing, or splitting the cost. KDHE puts a typical Kansas system at about $1,000 to $1,200, which helps frame the conversation. See our radon cost guide.
KDHE reports that mitigation systems bring radon below 4.0 pCi/L in 95% or more of homes. Learn how systems work on our radon mitigation page.
The EPA defines closed-house conditions as keeping all windows closed, keeping exterior doors closed except for normal entry and exit, and not running fans or other equipment that brings in outside air. For tests of 2 to 4 days, those conditions start at least 12 hours before the test. Run heating and cooling normally, but for tests under a week use only air conditioning that recirculates indoor air. Do not move or cover the device. Testers may use tamper seals or ask the occupants to sign a non-interference agreement, and the EPA notes that interfering with a test can invalidate the result.
The EPA says it is better to correct a radon problem before the home goes on the market, because you have more time. A pre-listing test lets you fix a high result on your own schedule rather than under an inspection deadline. The Kansas Radon Program also notes that many relocation companies want a home to test below 4 pCi/L before they buy it. For the basics, see radon testing in Lawrence. Selling outside Lawrence? Read our Eudora and Baldwin City radon guides.
No. KDHE says Kansas does not require radon testing or mitigation as part of a sale. Every contract must include a radon notice, and sellers must disclose known information showing elevated radon.
KDHE says a radon test performed as part of a buyer's home inspection in Kansas must be done by a state certified radon measurement professional, so a DIY kit is not the right tool for the transaction.
The measurement runs at least 48 hours, after at least 12 hours of closed-house conditions. Add time for setup and pickup and schedule it early in the inspection period.
It is negotiable. Kansas does not require mitigation, so buyer and seller decide. Common outcomes are a seller-installed system before closing, a credit to the buyer, or a split.
Sources: EPA Map of Radon Zones · EPA Home Buyer's and Seller's Guide to Radon · KDHE radon laws · KDHE Radon & Real Estate · Kansas Radon Program: mitigation · Kansas Radon Program FAQ
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