Good insulation and air tightness through draught proofing is the key to ensuring low heating costs. If you can meet the Passivhaus standard enabling a highly insulated and well designed property with efficient heating and ventilation, it is possible to reduce your heating bills to just one tenth of the average UK home. Your heating cost, with some investment, could therefore be just £60-70 per year.
Current building regulations require high standards of insulation. Without good insulation and draught proofing ,your building will lose heat quickly and maybe very cold in the mornings or after weekends for commercial property. A highly insulated property will retain much of the internal heat with much less energy needed to get back to a comfortable temperature.