Radon is a standard question in the conveyancing process. It is on the CON29 form and appears as section 3.14 of environmental searches. The standard wording will be similar to:

'records indicate that the property is located within 25 metres from the centre of a search in a radon affected area.'


'records indicate that the property is in a 'Radon Affected Area' as identified by UK Health Security Agency.'

What does this mean?

The wording can sometimes be ambiguous: The important question is: Is this property in a radon affected area? You can look up the area your building is in by downloading the relevant atlas.


The Atlas for Northern Ireland will tell you if the property is in an affected area or not, and if so, what the risk banding is. The Atlas for both England and Wales and Scotland are based on a worst case scenario. The geology for England and Wales has been plotted on the map, the country has then been divided into 1km grid squares. Then the square has been allocated a risk banding based on the highest probability that appears within that square. An Address Search can be completed, which will show the individual property risk, based on the geology. This costs £3.90 and is available instantly as a PDF.

If the property is in a >1% area (also called a radon affected area)

  • PHE recommends that the property is tested.
  • Enquiries should be made of the current owners to see if a test has already been done at that address
  • If not, you should advise your clients to test when they move in
  • A retained fund can be arranged to cover remedial costs

We have also compiled some information for you to pass onto your client if they are buying in a radon affected area.