…. 363,534 85 / 668 / 2030 Housing R8 Whole house deep retrofit to net zero energy standard (eg Energiesprong). Including heat pump, solar PV, battery storage and space heating demand <30 kWh per m2 per pa. 379,044 88 / 697 / 2030 Housing R9 Assumed package of loft insulation, floor insulation, triple glazing and air tightness and ventilation…