Basically when the building is completed, typically everything has been finished apart from the carpets being laid. But before handover.

Inviting the test body to site too early is likely to jeopardise the result, mean testing is impossible or not satisfy the building inspector.

This does place extra pressure on getting things right first time, remedial works at this stage may be awkward and cause expensive delays.

It is important that the air barrier is complete and any penetrations have been fitted and finished.

For dwellings we have produced a checklist to gauge whether the units are sufficiently complete.

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