Part L1A Regulations - Relevant to New Dwellings

Using CPS's own specialised designs and manufactured equipment we can test Houses, bungalows and individual flats.

Air testing regime using Approved Construction Details

One of each dwelling type will need to be tested
If any dwelling fails the test then the remedial work needs to be carried out and a further test carried out. A further dwelling also needs to be tested.

Air testing regime when not using Approved Construction Details

Number of Instances of the *dwelling Type*	Number of tests to be carried out on each dwelling type
4 or Less	One test of each *dwelling type*
Greater than 4, but equal or less than 40	Two tests of each *dwelling type*
More than 40	At least 5% of the *dwelling type*, unless the first 5 units of the type tested achieve the Design air permeability, the sampling frequency can then be reduced to 2%

If any dwelling fails the test then the remedial work needs to be carried out and a further test carried out. A further dwelling also needs to be tested.

For Developments of two or less houses then a figure of 15 m³/hr/m² can be used for the BER Calculation and no test is required. Alternatively if the same contractor has built the same design in the previous 12 months and can prove a compliant result then also no test is required. (BER: Building Emission Rate – from SAP calculations)

All Inclusive Service

Should a residential test fail, CPS's experienced staff will work with you to locate the air leakage paths and advise on sealing. Once the leakage paths are sealed by site staff we will carry out further air tests on the same day to try to obtain compliance at no extra cost.

Further visits however, on another day, will charged at the same fee again.

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