This method requires the contractor to test 1:10 units adopting each specific construction. All tests must be carried out by accredited acoustic engineers with the structure needing to achieve the minimum prescribed acoustic values.

This method eliminates the need for continual testing. Contractors can select from a number of rigorously tested approved robust constructions that will, if installed correctly, provide a level of sound insulation in excess of Part E requirements. The contractor then registers each unit that adopts the detail with Robust Details Limited, tel 0870 240 8209 and pays a registration fee.