Residential Testing

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

Part L1A regulations: Relevant to New Dwellings

Air testing regime using Approved Construction Details

• One of each dwelling type will need to be tested.
• One of each dwelling type will still 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

• 4 or less dwellings : one test on each dwelling type
• More than 4 but less than 40 dwellings: 2 tests on each dwelling type
• More than 40 dwellings:  at least 5% of each dwelling type, unless the first 5 units tested pass the Design Air Permeability. If so, the sampling can 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.

Normal and Best Practice:

For Developments of two or less houses then a figure of 15 m³/hr/m² can be used for the DER 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. (DER: Design Emission Rate – normally the SAP calculations)

Should a residential test fail by site staff, 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.