Your BER Cert Ifsc is calculated through energy use for space and hot water heating, ventilation, and lighting. The number of people likely to occupy your home in Ifsc is also taken in consideration. This is based on the average number of occupants in buildings of a similar size.
A Building Energy Rating or BER Ifsc is an energy efficiency rating for a building. It indicates the level of carbon dioxide emissions and KWh/m2/yr of a property for a dwelling at the time of certification. Most houses built in Ifsc before 1990 score a D3 rating or worse. This is particularly the case where there have been no upgrades or significant energy improvements.