There are different ways to find the Radon Potential for an address or area of land.
DEFINITIVE SEARCHES
These use the full radon data set of 25 metre x 25 metre squares
Individual address searches (with valid postcode)
Suitable for homes and small workplaces no larger than 25 metres in any direction. The search is available on this website for a fee of £3.90. More information and to order the search.
Large buildings and land
British Geological Survey also provide a search service covering larger areas. The fee for each search is around £50. British Geological Survey
Local Authorities and Environmental Search Companies
Some other organisations are licensed to use the definitive radon data set in their search services.
INDICATIVE SEARCHES
These use data grouped by area or postcode
Indicative Maps
These show the worst level of radon potential for every 1 kilometre square and can be accessed here
Postcode List Assessment - indicative search
This is a cost effective way to complete a radon potential assessment against a large number of properties at one time. The fee is based on the number of addresses. More information
| Radon potential band (%) |
General risk |
Affected area? |
Test advised? |
Building Control Regulations? |
| England & Wales |
Scotland |
Northern Ireland |
| 0 - 1 |
Low |
No |
No# |
No# |
No# |
No# |
| 1 - 3 |
Medium |
Yes |
Yes |
No# |
Yes - Stage 1 |
Yes - Zone 1 |
| 3 - 5 |
Medium |
Yes |
Yes |
Yes - Basic |
Yes - Stage 1 |
Yes - Zone 1 |
| 5 -10 |
Medium |
Yes |
Yes |
Yes - Basic |
Yes - Stage 1 |
Yes - Zone 1 |
| 10 - 30 |
High |
Yes |
Yes |
Yes - Full
|
Yes - Stage 2
|
Yes - Zone 2 |
| Over 30 |
High |
Yes |
Yes |
Yes - Full |
Yes - Stage 2 |
Yes - Zone 2 |
# Testing existing buildings and fitting radon prevention in new buildings might still be considered, particularly if there is a high risk location such as a routinely occupied basement.