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Summary of energy features

How efficient is your property?

The summary of energy performance related features section of the EPC shows the most crucial energy related elements of the property in the form of a table. The table is broken down into the different elements of the property such as:

  • Wall construction type
  • Roof construction type
  • Floor construction type
  • Windows and glazing
  • Main heating system
  • Main heating controls
  • Secondary heating system
  • Water heating
  • Low energy lighting

The table then shows how each of the different elements of the property are performing in terms of their current energy efficiency and environmental performance.

The descriptions provided are based on the data that has been collected specific to the property’s thermal and heating elements. These descriptions are shown graphically using 1 to 5 star ratings. These are equivalent to:-

  • Very Poor
  • Poor
  • Average
  • Good
  • Very Good

In some cases, due to the RDSAP calculation methodology, some of the elements have to be assumed. Floors are a typical example of this as it is usually not possible for the energy assessor to identify whether any additional floor insulation is present. This is because the survey is non-invasive and the assessor cannot use a drill to lift floorboards or pull back carpeting.

Some of the descriptions could lead to concern for the homeowner and it is important to understand the reasoning behind these. For example, the energy efficiency of the hot water system may be given a ‘Poor’ rating because of the cost associated with electricity compared to the cost of gas. The environmental impact may also rate as ‘Poor’ due to the carbon emissions associated with electricity generation. This does not mean that the system is of poor quality, poorly manufactured or poorly installed.