Air Tightness Testing

Service Overview

We are based in Norfolk and cover all of East Anglia & more. This includes Norfolk, Suffolk, Essex, Cambridgeshire, Hertfordshire, Bedfordshire, Buckinghamshire, Lincolnshire and London.

We can usually attend well within 5 working days, and will send your official ATTMA certificate, by email, within 24 hours of test completion.

We will provide a pre-test checklist when you book your test and can give you advice on how to prepare for a successful test.

Coming from a construction background, we always take the builders point of view and aim to work with you to cause minimum disruption and help your project achieve compliance as efficiently as possible.

What happens during the test

When we arrive, we carry out a brief walk around inspection of the property to identify any obvious issues which would prevent the property passing the test. We then make sure all the windows, doors and trickle vents are closed.

We then carry out our temporary sealing. There are very strict rules and regulations as to what can be temporarily sealed prior to an Air Leakage Test, so we are only allowed to temporary seal  the following:

  • Mechanical Ventilation (Extractors, MVHR & Air Handling)
  • Trickle Vents
  • Air Conditioning
  • Passive Ventilation
  • Chimney Flues

Anything other than the above, cannot be temporarily sealed for the Air Leakage Test.

After we have completed temporary sealing, we proceed to set our equipment up, usually in the front door.  We then begin the test, usually by depressurising the building. The final result is taken at a negative or positive pressure of 50pa.

If all is well, and the property is achieving under the desired Design Air Permeability (Air Test Target) we then proceed in carrying out the full test.

If we run into any issues, preventing the building from reaching the desired Design Air Permeability, we then work with you in trying to find the cause of any leaks. Hopefully the issue can be sorted whilst we are on site, allowing us to carry out a re-test while on site (free of charge) and the achieve below the desired design air permeability.

Once we are happy the building has passed, we then disassemble our equipment, write you a brief advise note confirming the property address & achieved result. We will then provide you with your official ATTMA lodged Air Test Certificate within 24 hours of the test.

If you need anymore info/advice, or need to book an Air Test:

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