Airtightness Testing


An airtightness test is a method of measuring the uncontrolled airflow in and out of a building, not to be confused with ventilation, which is the controlled airflow.




Why test your home’s airtightness?

Air inlets are often challenging to find. They are often caused by gaps around plumbing pipes, which should have been sealed when they were installed.

Airtightness tests commonly find holes of which the householder was entirely unaware.

So very useful for assessing the airtightness of renovations!


How is an airtightness test performed?


The test uses similar equipment to our draught detection service but differs in that it quantifies the amount of air leakage, allowing a comparison with standard values and re-tests to highlight improvements.



Tests are carried out in accordance with BS EN 13829: 2001 as outlined in ATTMA TSL1.


Test Results


The final report gives a number of results such as:


The values can be compared against future tests, highlighting any improvements from draught-proofing.



All new houses are airtightness tested. The aim is to get below 10 air changes per hour, although half of this is easily achievable. PassivHaus buildings are considerably tighter but are then fitted with whole house ventilation, with heat recovery.


Call: 01467 643113

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