Air Leak Test

What Is An Air Leak Test?

An air leakage test is the practice of the air tightness testing of a building. Air leakage can occur within the building through holes, gaps and cracks within the building. Air permeability of a building can have a significant impact on how much heat is kept inside and how much cold is let into a building which can have a significant impact on fuel bills for the building’s owner. The air leak test will occur at structural completion, generally just before the building handover. If your building shows differential pressure upon inspection and air tightness testing, Complete Sustainability can identify the key air leakage paths and recommend the most suitable course of action needed.

Air Leakage testing is a requirement of Building Regulations Part L1A/L2A

For buildings assessed under Part L2A (Commercial Units), any unit with a floor area of above 500m2 must have an air leak test carried out.
Buildings under 500m2 do not have to carry out an air leakage test, however a default figure must be used within the SBEM calculations which will have a detrimental impact on the assessment.

For buildings assessed under Part L1A (Residential Units) you can opt to test every dwelling on the site, or a certain number of types (generally agreed with Building Control). However, if not all dwellings are testing, a ‘confidence factor’ of 2 will be applied to all plots meaning you will have to work harder on the plots that are tested.

At Complete Sustainability, our  air leak test engineers team cover sites for air pressure tests throughout England and Wales, working closely with our technical team to ensure reports are produced and issued on the same day. To find out more about our air leak test solutions, please call 0161 706 0298 or email any enquiries to Alternatively, fill in your details below and we will aim to get back to you as soon as possible.