RadonPilot

Transactions

Radon When Buying or Selling a Home

Radon becomes urgent in a transaction not because the risk changes, but because the timeline does. Understanding the sequence in advance is what keeps the decision technical rather than reactive.

The transaction workflow

Buying a home with an elevated radon result1Radon test during inspection period2Elevated result reviewed3Certified professional evaluates the home4Mitigation scope and cost negotiated5Post-mitigation test documents result
A transaction workflow: a radon test is performed during the inspection window, the result is reviewed against published guidance, quotes are gathered from certified professionals, mitigation is negotiated, and a post-mitigation test documents the outcome.
Who pays, what deadlines apply and what each party may require are governed by the contract and by applicable law and disclosure practice. We do not state that a seller or a buyer always pays, or that you have a specific number of days. Confirm those details with your agent and, where appropriate, an attorney.
Source: US EPA — Home Buyer's and Seller's Guide to Radon · United States · guidance · Last verified: verification date not recorded

Buying a home

A radon test during the inspection period is the standard route to a number you can act on. Because those tests are usually short-term and conducted under time pressure, conditions matter enormously: an open window during the measurement can change the outcome.

  • Have a radon test performed within the inspection window, by a certified tester where appropriate.
  • Confirm closed-building conditions were maintained throughout the test.
  • Compare the result against published EPA action guidance.
  • Get the home evaluated by a certified professional before agreeing a remedy — the design determines the price.
  • Collect written mitigation quotes describing the same scope.
  • Agree who arranges and pays for the work, and by when, in writing.
  • Require a post-mitigation test and get the report before closing where the timeline allows.
  • Keep the installation documentation, warranty and all test reports.

Interpreting an elevated result · What mitigation costs

Selling a home

A seller's position is strongest when radon is documented rather than discovered. If the property has been tested before, or already has a system, assemble that history early — missing paperwork can cost more in negotiation than the work itself.

  • Gather existing radon test results, including dates and test types.
  • Locate installation records for any existing mitigation system.
  • Confirm an existing system is operating, and note the system monitor reading.
  • Consider testing before listing so the number is not a surprise mid-contract.
  • If mitigation is agreed, use a professional certified in Pennsylvania.
  • Provide the post-mitigation test report as part of the transaction file.
  • Follow applicable disclosure practice for your transaction — confirm specifics with your agent.

A home that already has a system

An installed system is a positive, not a red flag — provided it is documented and working. Buyers should ask for the installation record, the most recent radon test, and confirmation that the system monitor shows suction. A current test resolves most disagreement quickly.

If the system looks questionable · Maintenance and documentation

Timing pressure and short-term tests

Transaction testing is usually short-term because it has to be. That is a legitimate use of a short-term measurement, and it also means the number is a snapshot. Where the result is borderline, a further measurement — before or after closing — often clarifies the picture.

How to make a test result usable

Source: US EPA — A Citizen's Guide to Radon · United States · guidance · Last verified: verification date not recorded

Where to go next

Radon testingConditions, placement and measurement types.High result?Next steps after an elevated reading.CostScope drivers for negotiating a remedy.Verify a professionalCheck certification before the clock runs out.

Request quotes during your inspection window

Share your test result, foundation type and project details. We pass your request to independent radon professionals — we do not perform the work ourselves.

Request Quotes