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Air Permeability Testing

Air Permeability Testing

Air Permeability testing is required for every domestic and commercial new build to be fully compliant with Part L1A & L2A of the Building Regulations. An air permeability test is carried out with a specialised fan that depressurises or, where required, pressurises the dwelling. This is done to measure the amount of air lost as a result of the building’s design.

Why Airtight Testing Staffordshire?

At Airtight Testing Staffordshire, we provide a fast and reliable air permeability test service for new builds across the Midlands. We are also able to provide our air permeability testing throughout the UK on request.

What are the Air Permeability Requirements?

When it comes to building regulations, while there is a maximum air permeability value of 10 m3.h/m2, this is only a guideline. This is because every new build has its own designated air permeability target. This is something known as a ‘target score’ and is usually assigned by your SAP assessor at the beginning of your project.

Our air permeability test is carried out to ensure that your dwelling meets this initial target set by your SAP assessor. If your new build meets your required air permeability target, building control can then approve both the air permeability score along with your SAP calculations.

When Should I Book My Air Test?

When Should I Get an Air Permeability Test?

  • SAP completed – this will set the target value for the air permeability testing
  • Trickle vents fitted
  • Loft hatch fitted and sealed around the perimeter
  • Plumbing complete and traps filled
  • Power available in dwelling
  • All lights and sockets fitted
  • Incoming services sealed (Electric, Water, Gas etc.)
  • Boiler flue and ventilation system penetrations sealed.
  • All windows and doors fitted
  • Skirting board fitted and sealed


What is Test Sampling?

When there are multiple buildings of the same build type and size, you may be able to get a sample test. While this can save some time, this air permeability testing method does incur a 2 m3.h/m2 penalty to all dwellings that have not been tested. That’s why it is vital for a higher build specification across the tested dwellings to meet building regulation requirements.

With the requirements being more difficult to meet, it is often more cost-effective to test dwellings individually. Doing your air permeability test this way ensures that you are able to avoid penalties being applied to each dwelling by building control.