On 1st October 2019, the Ministry of Housing Communities and Local Government (MHCLG) published The Future Homes Standard consultation. Within Chapter 5 of this consultation, it was proposed that an airtightness testing methodology written by the Chartered Institution of Building Services Engineers (CIBSE) should be approved. The reasoning for this is to ensure that the approved methodology for airtightness testing is independent of all organisations with an associated competent person scheme. In response to this, CIBSE released a revised draft of TM23 on 17th October.

Having listened to members’ views iATS has now published our ‘draft’ consultation response to the revised draft of TM23. Our overall key messages are:

  1. Having appropriate governance by CIBSE taking ownership of the testing methodology is a positive move.
  2. The proposed revised draft CIBSE TM23 document does however need work to make sure it structured for, and includes all required information for airtightness testers.

iATS Scheme Coordinator, Jennifer Hartley, urges airtightness testers to have their input: “Please take the time to read through and respond to the consultation on the proposed TM23 document. There is no one better placed to comment than our members who carry out airtightness testing for a living.”

iATS are now seeking input on this draft consultation response which will influence its final response before it is submitted by the deadline of 10th January 2020. The final submission will also be published for the benefit of members.

Please note that iATS has had confirmation from CIBSE that the original deadline of the 10th January shall not be extended for responses to the proposed revisions of TM23.


To read the draft CIBSE TM23 document click here.

To read iATS’s draft response click here.

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