What factors effect your EPC result and why?

What factors effect your EPC result and why?

The following variables are generally considered the most important factors in the energy performance of a property.

  1. Age of the property – Generally, the newer the property, the more energy efficient it will be due to improving building standards. However this may not always be the case.

  2. Wall construction – Again, generally, properties built before 1950 will have a solid wall, with no cavity. These walls are less efficient at keeping the heat in a property than a newer house with a cavity wall. In addition, a filled cavity wall, or other types of wall that have insulation pre-built into them will be even more energy efficient.

  3. Orientation of property – A mid-terrace house will perform better in general than a house of similar age which is detached. The more walls that are exposed to outside (heat loss walls) the less energy efficient the property. Also a large house with long exposed walls and larger spaces to heat will be less efficient than smaller more compact houses.

  4. Energy source – The energy used to heat a property has a large bearing on the overall score achieved. For example, a property that is heated with gas will achieve a better score than a property solely heated on electricity, oil or LPG. This is due to the unit cost of gas being cheaper than other forms of energy and it is less environmentally harmful in terms of C02 emissions.

  5. The boiler - The type of boiler found in the property has a massive effect on the score. Different boilers have different efficiencies. A back boiler from the 1970s is roughly 65% efficient. The latest condensing boilers are around 92% efficient. Changing an old boiler to a new efficient one can increase the EPC score by a significant margin.

  6. Heating control system – having a good range of controls for the heating system, such as a programmer, room thermostat and radiator thermostats will increase the efficiency of a property, as heat can be effectively targeted around the house at the right time and the most appropriate temperature.

  7. Loft insulation – This is one of the cheapest and most effective ways of making a property more energy efficient and therefore saving money. The more insulation there is the better. It is recommended that a property has around 250mm of insulation.


With thanks to Vibrant Energy.