Details of external sound insulation of the building envelope in pursuant to condition 10 of planning application ref: 214645FUL dated 23/03/2022 for: Conversion of a single dwellinghouse into four self-contained flats; part single, part two storey rear extension; alteration of roof from hip to gable end, rear roof extension; installation of three rooflights to the front roof slope, associated parking, boundary wall alterations, landscaping, cycle and refuse storage