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Air Tightness Testing & Air Leak Testing

Air tightness testing is the measurement of the airflow through the envelope ( external walls/ windows/door etc)

In most existing buildings the air-tightness levels are very poor as up to recent years it was not a requirement in the building regulations.

From 2008 building regulations require an air-tightness test with 10 or less ach (air changes per hour). From 2011 this has improved to 7 ach.

To achieve this level of air-tightness in the building envelope it is important for all of the trades to be aware of potential air leaks and the importance of minimising and reducing unintentional air paths as far as is practicable.


  1. When building a new house.
  2. When building an extension.
  3. When retrofitting existing building.
  4. When changing windows.
  5. If you feel the house is draughty/cold.

Air Tightness Testing in Practice


The Test

Airtightness Blower DoorWe give practical guidance to our clients before the test on where the possible areas of leakage are during and after the air tightness testing process.
During the test we help pinpoint the areas which may require attention by using tools like a smoke test and thermal imaging camera. When combined they can quickly show any problems. A clear course of action can then be implemented to eliminate the air leak in question which will enhance the buildings energy conservation and comfort in most cases.

We are certified by the Passiv House Academy to measure the airtightness of dwellings.

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Air Quality & Energy Conservation

It has been proved that Indoor Air Quality of homes significantly affects comfort and health of their occupants. In particular, air leakages have been identified as one of the major causes of energy consumption and discomfort by the building industry. Indeed, the elimination of air leaks is a crucial factor in ensuring that insulation really does perform and that the building structure remains free of structural damage.