Data, updated every 6 months, on membership numbers of third party certification air tightness testing schemes for new buildings.
The Department for Communities and Local Government has authorised 2 third party air tightness testing certification schemes.
Every 6 months we ask the schemes to provide us with information on their total registered membership at the end of the 6-month period and the number of jobs the registered members have undertaken in the period.
The latest published data covers the period from April 2016 to March 2017.
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