Buying and selling a home
Radon Testing During a Montana Home Purchase
Put the test protocol, contract dates, decision rights, mitigation scope, and final documents on one shared timeline.
Illustration for explanation only. It is not a photograph of our work.
Know the legal document and the technical test
Montana Code 75-3-606 requires a radon disclosure statement in at least one covered transaction document. It also addresses providing known prior test results and evidence of mitigation. That disclosure is not the same as a new test and does not predict the home’s current level.
The purchase agreement controls deadlines and remedies. The measurement protocol controls how the test is performed. Keep those roles clear and use licensed real-estate or legal professionals for contract advice.
Interactive checklist
Transaction file checklist
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Buyer checklist before the test
Ask for the complete history before ordering a new measurement. A prior low result may no longer represent current conditions if it is old, the home changed, or the buyer plans to occupy a lower level that was not tested.
Confirm who hires the measurement professional, who controls access, how interference is addressed, and when the report must be delivered.
Seller checklist before listing
Gather old tests, proposals, invoices, warranties, and post-mitigation results before they are requested. If an active system exists, check the warning device and arrange a radon test if the records no longer reflect current conditions.
Early action can create more time for confirmatory testing, bids, installation, and independent verification. Do not promise a result, cost, or schedule before a qualified provider reviews the home.
If the result changes the negotiation
A useful mitigation proposal describes foundation zones, suction strategy, pipe and fan route, electrical responsibility, sealing or membrane work, documentation, and post-mitigation testing. A single total with no scope can create disagreement later.
If work will occur before closing, assign responsibility for access, change orders, final payment, failed post-testing, warranty transfer, and delivery of records in writing through the transaction professionals.
The closing file should tell the whole story
Transfer the full before and after reports, contract or proposal, invoice, system description, labels, operating instructions, applicable permits, and written installer warranty. Record the date of the latest test and the normal state of the warning device.
The new owner should know that the warning device does not measure indoor radon. Periodic radon testing verifies the concentration over time.