Buying a home
Radon is the longest item in a typical inspection period: twelve hours of conditions, the measurement, then a quote if the result is elevated. Buyers lose on the calendar far more often than on the argument.
Nothing here is legal advice. Where an item turns on your contract, take it to your agent.
Day one of the inspection period
Order the radon test now, not after the general inspection report — hard to reverse later
It is a separate service on a longer clock, and the days are the constraint.
Confirm who is placing the device and what credential they hold
Measurement is separately credentialed from mitigation in states that license both.
Ask for a continuous monitor if the result may be disputed
The hourly log evidences whether conditions held, which turns an argument into a document.
Notify the seller and listing agent in writing of the conditions required — hard to reverse later
An open window during a showing is the most common way a transaction test is lost.
If the house already has a system
Test anyway — hard to reverse later
An installed system proves an owner acted once. It does not prove it works today.
Check the manometer columns are offset — hard to reverse later
Two seconds, and it tells you whether the system is developing suction at all.
Confirm the fan runs and is outside conditioned living space
Standard requirement, and it governs future replacement cost.
Ask for the original post-mitigation verification report and installer credential — hard to reverse later
Without them you are buying an undocumented system.
Ask whether the warranty transfers
Sometimes it does. Worth asking in writing.
If the result is elevated
Get a written quote from a credentialed contractor who has seen the house — hard to reverse later
A specific scope and number is a far stronger request than a general one.
Decide which ask you are making before you make it
Seller installs, seller credits, split, or you absorb it. Leverage and your contract decide which is realistic.
Put certified contractor, written scope, and verification-before-closing into the amendment — hard to reverse later
A system with no verification test is equipment, not a remedy.
If a credit, size it from the quote and not from an average — hard to reverse later
A credit short of the real scope leaves you holding the difference.
Before closing
Collect the verification test result, dated — hard to reverse later
This is the deliverable. Leverage disappears at the table.
Collect the credential number, scope, and warranty terms
Start the folder you will hand the next buyer.
If work is not finished, confirm the escrow or holdback arrangement in writing — hard to reverse later
A promise to finish after closing is worth what the document says it is worth.
What this checklist does not cover
A checklist that pretends to be complete is worse than one that states its edges. These are the things deliberately left out, each with somewhere better to go:
- Nothing here is legal advice. What your contract requires and what a deadline means belong with your agent and, where warranted, an attorney.
- This does not tell you what to ask for in dollars. That comes from a written quote.
- It does not tell you how often each negotiation outcome occurs — we publish the taxonomy and not a distribution.
Confidence and limits of this page
Every decision resource on this platform states its own boundaries. This is not a disclaimer — it is the part of this checklist you should read before relying on it.
- What we knowClaims on this page we stand behind, each traceable to an approved source or to observable structure.
- No state this platform serves requires a seller to test or to mitigate an existing home; the response is negotiated.
- A short-term test needs twelve hours of closed-building conditions before it starts plus its measurement period, which makes it the longest item in a typical contingency.
- An installed system does not evidence current performance. Fans fail silently and pipe runs get altered during renovation.
- What we do not knowQuestions you may reasonably have that this page does not answer.
- How often each negotiation outcome actually occurs, in your state or anywhere. Our frequency instrument holds zero observations.
- What your local market custom is. Your agent knows; we do not.
- What research would settle itWhat it would actually take to answer the above — naming it is the difference between honesty and hedging.
- Three hundred post-closing homeowner reports coded against the published outcome taxonomy would establish the real distribution. That instrument exists and holds nothing yet.
- Measured laboratory turnaround by region would let this checklist give you a real timeline rather than a planning range.
- What we do not claimClaims you might expect to find here and will not, with the reason.
- We do not give legal advice and route contract questions to an agent or attorney.
- We do not claim a universal rule on who pays.
- We do not claim a dollar figure for any remedy.
- What we cannot independently verifyFacts this page relies on that we could not confirm ourselves.
- Your contract language, your state’s current disclosure form, and your local market conditions. All three bear on this and none is visible to us.
Sources
- U.S. EPA — Radon
- U.S. EPA — Home Buyer’s and Seller’s Guide to Radon
- U.S. EPA — A Citizen’s Guide to Radon
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