Radon

Can the surveyor smell or see radon during the inspection?

No. Radon is a radioactive gas from the ground. You cannot see it or smell it. A home survey records what is visible. A comment that the area is a radon area is not a reading, and silence is not a clearance below 200 Bq/m3. Measurement is a three-month test with detectors in a bedroom and a living room.

Last reviewed 24 October 2026. Written for buyers in England and Wales unless this answer says otherwise. No named surveyor has signed this page. It is general guidance, not a report on your house, and not legal advice.

What is the fuller explanation?

Surveyors are sometimes given a postcode flag by their desktop search. That flag belongs with the map, which shows chance, not the level in the house. Ask them to say which source they used. Do not let “environmental matters” in the limitations become either a crisis or a comfort.

If you want the number before you commit, you need the test booked, not a longer visual inspection. Report turnaround for the survey is unrelated to the three months the detectors sit there. The published address-search fee of £3.90, reviewed on 24 October 2026, buys a chance estimate, not this inspection and not a repair.

What should you ask your surveyor?

What did you actually consult before you mentioned radon?
Is radon listed as a limitation rather than a finding?
Did anyone provide a measurement with the papers?

What are the typical next steps?

Read the environmental section as sources and limits, not as a becquerel result.
Book a test if the decision depends on the level.
Do not ask the surveyor to “add radon” to the fee and expect a number the next day.

Costs vary with the building and with who you instruct. Where this page does not cite a published figure, ask the surveyor, a relevant specialist, or your solicitor for a written quote. Do not treat a forum average as the price.

Also asked about this

Is a musty cellar radon?

Musty air is a smell, usually moisture or a lack of ventilation. Radon has no smell. Deal with the moisture on the evidence you can see.

Should every survey in the country mention radon?

The survey should follow its scope. It should not pretend to have measured a gas it cannot see. Ask how this firm treats environmental searches.