The government has now released an updated version of Approved Document L (Conservation of fuel and power) for England. This update signals a move towards more energy efficient new buildings. These new regulations will come into force from the 15th June 2022.

A summary of the information relevant to Airtightness Testers can be found below:

Airtightness Testing made mandatory for all new builds
Airtightness Testers will be getting busier come June 2022, with the new approved document highlighting the requirement for an airtightness test to be undertaken on every single dwelling. Buildings that are not dwellings (including extensions which are being treated as new buildings to comply with Part L) must also be pressure tested- some exemptions will apply here.

Pulse introduced as alternative air testing method
From June 2022, Airtightness Testers can use either the traditional blower door test or the Pulse test, to determine the air permeability of a dwelling. In order to lodge airtightness tests using Pulse through the iATS scheme you must attend a training course, more information on this can be found here

Changes to equipment calibration
Originally calibration of testing equipment was required every 12 months, however, Airtightness Testers can now choose to recalibrate according to the manufacturer’s guidance. It is still recommended that recalibration is completed at least every 24 months.

Awaiting the new CIBSE TM23 standard
Approved Document L states that Airtightness tests should be performed following the guidance in the approved airtightness testing methodology- CIBSE’s TM23. This guidance will replace the existing one from ATTMA. We have yet to see the full published version of this guidance, but will of course provide further information when it is released.


You can take a look at the Approved Document in full here: https://www.gov.uk/government/publications/conservation-of-fuel-and-power-approved-document-l

To read the draft CIBSE TM23 document click here.

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