SBEM Calculations (Simplified Building Energy Model) are a requirement of the Building Regulations Part L2 and must be submitted to building control at two stages in the development process:
• Design stage – prior to commencement of the development project, an SBEM Calculation must be submitted to your local building control, alongside your application
• As-built stage – upon completion of the building phase, it is required that both an SBEM Calculation and an EPC are submitted prior to sign-off by Building Control

SBEM is an approved software tool that is used to calculate the monthly energy consumption for: space heating and cooling, water heating, ventilation and lighting, and also estimates the annual total of CO₂ emissions for the building.