Official guidance at UKHSA’as UKRadon website states:
Radon levels can change if the structure of the home changes or if you change the way the home is occupied. Changes likely to alter the radon levels include home improvements (for example installing central heating, double glazing or extra insulation), major building works (extensions, loft or basement conversions) or changes such as whether particular rooms are used or heated differently, as might happen when there is an addition to the family or when occupants retire. A change in occupants can also alter the level.
If the original result was well below the target level (100 Bq m-3) and there are no significant changes to your home or to your living style, there is no need to retest.
If the original result was between the Target Level (100 Bq m-3) and the Action Level (200 Bq m-3) and there are no significant changes to your home or your living style you should consider remediation. If the test was carried out for a previous occupier or you have improved your home or added an extension or converted a basement you should consider re-measuring the radon level.
You may two options for radon measurement retesting, using either passive or electronic detectors.
Passive detectors, with no display, must be left in situ for significant periods of time ranging from 10 days to 3 months and afterwards sent to an accredited laboratory for analysis, only show long term averages and annualised values and no short term range fluctuations.
Electronic detectors typically comprise a digital display and show levels within minutes or hours but it must be noted any such readings are unofficial and should only be used for indicative purposes and never in place of official passive measurements. Electronic detectors should be accompanied by a calibration certificate from an accredited service provider.
Better Indoors is a highly experienced radon service provider. We offer both passive and real-time measurement services across the UK. Book an appointment today.
