If the home has already been tested, decide whether to accept the test results from the seller or ask the seller to do another test by Presidential Inspections (The buyer cannot legally do a test; only the homeowner can). Perform a long-term test after occupying the home.

If the home has not yet been tested for radon, test as soon as possible, either by the seller or by a licensed tester and the test is done in the lowest level of the home which is suitable for occupancy. Consider including provisions specifying who will conduct the test, what type of test to do, costs, additional escrow money for radon mitigation, etc.