To meet Part F2 of the Building Regulations in Northern Ireland, nearly all new commercial buildings over 50m² must pass SBEM calculations. And while some extensions, conversions and renovations will also need SBEM calculations, not all of Part F2 will apply to them.
SBEMs measure the overall energy efficiency of buildings, and are used to create the Energy Performance Certificate. To get a total figure, they measure heat loss through the building, available sunlight and air permeability, then combine this with the energy needed for heating, hot water, lighting and ventilation.
SBEM applies to commercial buildings including offices, hotels, pubs, sports halls and supermarkets. There are a few exemptions, such as some places of worship, temporary buildings and unheated units.