how is an EPC calculated

How is an EPC Calculated? Understanding the Process

Overview of EPC Ratings

The Assessment Process

Factors Influencing EPC Ratings

  • Building Characteristics: The physical attributes of the building, such as age, layout, and construction materials, significantly influence its thermal efficiency. For instance, older properties might have structural features that are less efficient at retaining heat compared to newer buildings unless they have been subject to energy retrofitting.
  • Heating and Cooling Systems: These systems are crucial in determining a property’s energy efficiency. The type of boiler, the presence of programmable thermostats, and the efficiency of the radiators or HVAC systems are all evaluated. Well-maintained and efficient operating systems contribute positively to the EPC rating.
  • Insulation and Ventilation: Effective insulation in the roof, walls, and floors minimises heat loss, which is a key factor in energy conservation. Proper ventilation systems are also crucial as they help maintain air quality and temperature regulation without excessive energy use.
  • Lighting and Appliances: The assessment includes a review of the lighting solutions used within the property. Energy-efficient LED lighting and appliances with high energy ratings can significantly lower the property’s overall energy consumption, thereby improving the EPC rating.

Calculating the Rating

Common Misconceptions

The Impact of EPC on Property Decisions


Additional Resources