Any conversions that are carried out whereby a "material change of use"occurs will likely need to satisfy regulation E and will need a regulation E test to satisfy building control that the works have met a sufficient standard and are compliant with regulation E.
The tests involve a machine generating noise in a room adjacent to or above the receiving room. Typically this is a speaker that plays a range of frequencies. It is the average result that is then calculated. This average is known as the Rw. This however is corrected for bass frequency performance ( Ctr correction) and this is known as the Rw + Ctr . It is this final figure that is what is used to determine a pass or fail.
RJ ACOUSTICS- We have an associated company that can both carry out the sound test and provide on site consultation pre the test should you desire.You can contact them directly at RJ acoustics. 01923 518 923. They also carry out aritightness testing.