Keeping it tight: How to save time and money on your air test

When it comes to air tightness tests, nothing is more important than planning in advance.

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Whether you’re preparing for a residential or commercial test, it can mean the difference between a fuss-free job and the headache of increased costs and missed completion deadlines.

Paying attention to detail from day one of the project is the best way to save on stress and needless cost increases. If you don’t pass your air tightness test, fixing problems on a failing plot can cost dearly in both time and money. 

Missing plaster under window sills, gaps between floorboards, unsealed pipes penetrating walls - there are several common problem areas that can mean an air test could fail. But the pitfalls are easy to avoid if you know where to look.

Get ahead of the game: spy areas of weakness, implement pressure-testing tips and pass first time round with this handy air test checklist:

  • Make sure your SAP assessors set a realistic DAP target. This can be the difference between a pass or a fail on your as built SAP and EPC - so if you don’t think it’s achievable, shout up.
  • Before air test teams arrive, all other trades should be finished. Ideally, they should also have vacated the plot, ready for the test to take place.
  • Don’t have your carpet fitted before an air test.
  • Do have the house as close to completion as possible.
  • All electrical sockets and light switches should be fully fitted.
  • Your plot should have power. If generators are needed, make sure you discuss this first with your testing company. 
  • Bathroom suites and kitchens should be fully fitted including plinths. One common issue to watch out for is services behind units - make sure these are properly sealed to avoid air leakage.
  • Skirting boards should be fitted and sealed where appropriate.
  • All external windows and doors should be fitted and sealed accordingly before the air test begins.
  • Drainage traps in all wet rooms should be filled.
  • Make sure that all waste and supply pipes are fitted correctly and sealed effectively.
  • Check that there’s an airtight seal between the loft hatch and frame. This is a real problem area for air leakage.
  • Avoid expanding foam. Instead, use flexible foams, which are more effective in the long term and are tested for air tightness applications.

24 hours from air test to EPC

Our efficient and reliable team can help you get the certification you need, headache-free and cost-effectively. And if something goes wrong, we’ll keep our boots on-site, give remedial advice and work to re-test, wherever we can.

We also guarantee a 24-hour turnaround of your air test certificate and EPC, when you order our Part L package of services.

Ready for an air tightness test? Call us for a chat and see how we can go above and beyond your compliance needs.

01904 674890


Contact us

We’re always happy to talk about your project, however big or small.


01904 674890

Clifford Chambers,
4 Clifford Street,


0207 0969186

161-165 Greenwich High Road,
SE10 8JA