How often should householders retest their radon levels after remediation?
HPA advises householders to retest their radon levels every 5 to 10 years after remediation, and after any major building works, such as new double glazing, central heating, adding an extension, or converting a basement, to check that the remediation remains effective. In addition, regular, say quarterly, simple visual or audio checks should be made to ensure any fans are still operating.
