39. For regulation 20(1) and the preceding heading, substitute—
20.—(1) Regulations 20 (provisions applicable to self-certification schemes), 25A (consideration of high-efficiency alternative systems for new buildings), 27 (CO² emission rate calculations), 29 (energy performance certificates), 37 (wholesome water consumption calculation), 41 (sound insulation testing), 42 (mechanical ventilation air flow rate testing), 43 (pressure testing) and 44 (commissioning) of the Principal Regulations apply in relation to building work which is the subject of an initial notice as if references to the local authority were references to the approved inspector.”.