PART L & BUILDING ENVELOPE

Air permeability testing.
Know where the building stands.

Coordinated air-pressure testing, leakage advice and completion evidence for residential and commercial projects across the UK.

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01

Testing coordinated with the energy model

Air-pressure testing measures uncontrolled leakage through the building envelope. We coordinate the test with the design-stage SAP or SBEM target so the result can be incorporated into the final compliance assessment without unnecessary delay.

02

Prepare before the tester arrives

A pre-test review can identify common leakage paths around service penetrations, windows, doors, loft hatches, membranes and junctions. This helps the project team understand the test conditions and reduces the risk of avoidable failure at completion.

03

Clear results and practical next steps

Following the test, the project receives the measured air-permeability result and appropriate test documentation. Where additional work is required, leakage investigation and remedial guidance can be coordinated before a repeat test.

04

Domestic and non-domestic projects

Testing can be arranged for individual homes, apartment developments, offices, retail units, industrial buildings and mixed-use schemes. Requirements and reporting are matched to the applicable regulations and project location.

COMMON QUESTIONS

Clear answers.
No guesswork.

01When should the air test be booked?+

Book early enough to secure a suitable completion date, but test only when the building envelope is complete and all items required by the tester are ready.

02What happens if the building fails?+

We can help interpret the result, identify likely leakage routes, coordinate diagnostic testing where appropriate and update the compliance model once a satisfactory result is achieved.

03Is air permeability the same as air changes per hour?+

No. They are related measurements but use different reference values. The required test method and result depend on the building type and applicable standard.

04Who completes the test?+

Testing is completed by an appropriately qualified EnergyWise Services assessor or an approved specialist testing partner, depending on building type and location.

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