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Air Tightness Testing

Air Tightness Testing Services

We conduct Air Tightness testing throughout the Midlands and are able to provide air testing throughout the UK on request, providing a fast and reliable service.

What Is Air Tightness Testing?

Since 2006, Air Tightness testing has been required to comply with Part L1A & L2A of the Building Regulations for Domestic and Commercial new builds. Air testing measures the amount of uncontrolled leakage from gaps and cracks in the building envelope using a specialised fan to depressurise (or pressurise) the dwelling.

Target Scores

In terms of air test requirements, building regulations have a maximum air permeability value of 10 m3.h/m2. However, each new build has a designated air permeability target, this can range from 1-10 and is usually assigned at the start of your project by your SAP assessor.

We test your dwelling to meet this initial target set by your SAP assessor. If your dwelling meets the target score, building control can approve both your air permeability score and your SAP calculations based on review.

Test Sampling

A sample test may be possible when you have multiple houses of the same build type and size. This sampling method, however, forces you to apply a 2 m3.h/m2 penalty to all houses not tested. Making it crucial for a higher build specification of the dwellings to meet air test requirements.

From our experience, air testing is often more cost-effective when all houses are tested individually. This means that you are able to avoid penalties being applied to each new build.

When Should I Book My Air Test?

When Should I Get Air Tightness Testing?

  • SAP completed – this will set the target value for the air tightness 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


Expert Advice

Airtight Testing Staffordshire are here to help you move quickly and easily through the air testing process. Our experienced test engineers can offer expert advice to achieve compliance.

We also offer a wide range of other services that make it easier to pass building regulations than ever before!