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Radon is a natural gas found in soil and rocks that has no colour, taste or smell. Levels of radon vary from country to country, region to region and even from house to house in the same street.

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Where does radon come from?

Radon comes from uranium, which is present to a small extent in all soils and rocks. It seeps out of the ground and can collect in enclosed spaces, such as houses. As amounts of uranium in the ground vary from place to place and because some ground allows air to move more freely than others, radon levels are higher in some parts of the country than in others.

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How does it get into my home?

In open spaces, when radon mixes with air, it is quickly diluted into the atmosphere, but when air, containing radon rises from the rocks and soil beneath your home it may find its way inside - mainly through cracks in floor, walls and gaps around service pipes. The level of radon indoors depends mainly on how much radon is in the ground and on the way in which the house is built.

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What are the risks?

Health studies around the world have linked radon with lung cancer. People who are exposed to high levels of radon are at risk of getting lung cancer and this risk is much higher to smokers than it is to non-smokers.

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What is considered to be a high level of radon?

The government has set an 'action level' for radon in houses of 200 becquerels. If the levels in a house are higher than this, the householder is advised to take action. Most homes in the United Kingdom do not have significant radon levels. However, surveys have shown that some parts of Somerset are at risk from levels that require action.

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How can I tell what level of radon is in my house?

Surveys have shown areas of the country that are at risk of radon. The British Geological Survey (telephone 0115 936 3143) can, for a fee, examine available data and advise whether or not precautions may be required in the particular area.

Public Health England also have an informative radon website on which you can search UK maps of radon to check your area for radon.  If you are concerned you can also order a radon measurement pack to find out the yearly average radon level for a property, and if it is above or below the Action Level.  Further information can be found at

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What precautions are needed if levels are high?

The Government has drawn up three categories of area with regard to radon:

  • Not radon-affected - no precautions required.
  • Basic radon precautions required - a well -sealed damp proof course, including a cavity tray.
  • Advanced radon precautions including a sump, beneath the floor, connected to the outside air  with a pipe to which a pump can be connected at a later date.

Building regulations now require precautions to be taken, where necessary, to prevent the ingress of radon gas into new dwellings. Building Control is the appropriate department to give definitive advice about radon precautions in new dwellings.

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Buying a piece of land that could be affected by Radon

If you are concerned that you are buying, or about to buy a property which you believe may be in a radon affected area and are awaiting test results, please talk to your solicitor about taking out a Radon Bond.

pdf Radon Information Sheet [74.12KB]