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Hindhead - Air Testing - 020 3390 0301

Around Hindhead and the surrounding areas our air testing consultants will offer professional advice on how to achieve your target rating.

An air test, or air tightness test, is undertaken to demonstrate compliance with Part L by determining the air permeability rating of a building. Air leakage areas can cause a considerable amount of lost heat and thus lower the energy efficiency of a building. For this reason, Building Regulations in Hindhead require all new buildings to meet certain permeability targets.

During an air test the pressure of the room will be tested and as such all windows and doors that lead outside must be securely closed to avoid them swinging open and the test being abandoned. Similarly, all internal doors should be wedged open to avoid being slammed shut. Furniture will not be affected during the test, but smaller items such as paper must be held down or removed completely so they're not blown about.

We've put together the following table to show how many air tests you may require.

We have professional, accredited consultants who can help you comply with EPBD Article 9 and the Energy Performance of Buildings Regulations.

No. of Dwelling Type Instances No. of Tests Per Type
4 or less One test of each type
Greater than 4, but equal or less than 40 Two tests of each type
More than 40 At least 5% of each type, unless the first 5 units pass, when the frequency can be reduced to 2%

Our expert consultants will undertake an assessment of the efficiency of your air conditioning system, reviewing sizing / capacity and offering advice on any improvements or alternative solutions. These solutions, if implemented, can in many instances reduce costs and thus pays for the inspection in the first year.

It is a requirement under the Building Regulations 2006 Part L that new dwellings in Hindhead must pass an air test prior to occupation; this test certificate must be produced for the dwelling to be signed off by local Hindhead building control.


Area (m2)

Leakage Rates (m3/hr at 50Pa)
5 7.5 10 15 20 25
2000 0.51 0.76 1.01 1.52 2.03 2.54
5000 1.27 1.90 2.54 3.80 5.07 6.34
7500 90 2.85 3.80 5.71 7.61 9.51
10000 2.54 3.80 5.07 7.61 10.14 12.68
12500 3.17 4.75 6.34 9.51 12.68 15.85
15000 3.80 5.71 7.61 11.41 15.21 19.02
20000 5.07 7.61 10.14 15.21 20.29 25.36

To carry out such a test with accurate results, we need some general requirements to be made available at the time of the test:

  • SAP Design air pressure test figure
  • An electricity supply
  • A water supply to enable traps to be filled

The report has all the details required by the regulations to indicate that a valid test has been performed.

We will seal all of the intentional leakage areas in the house prior to testing. These include:

  • Fireplaces
  • Extractor fans
  • Exhaust fans
  • Trickle vents
  • The odd uninstalled component

Everything else will have to stay 'as is' in the property.

For a quote or for more information, call our Hindhead air tightness / pressure testing consultant on 020 3390 0301 or email

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