An EPC (Energy Performance Certificate) rating is a measurement of the energy efficiency of a building. It is typically required when selling or renting a property in many countries, including the UK. The rating is based on factors such as insulation, heating systems, and the overall energy use of the property.

The rating scale typically ranges from A (very efficient) to G (inefficient), with A being the best and G being the worst. A higher EPC rating indicates that the property is more energy-efficient, which can mean lower energy bills and a smaller environmental impact.