What is an EPC

What Is An EPC?

An EPC or Energy Performance Certificate is a rating system for the efficiency of a domestic property or dwelling. The property is rated from A to G with A being the most efficient and G the least. The EPC will also produce recommendations on measures to take to improve the efficiency rating.

An EPC is required prior to marketing a property for sale or rent, and if the property is let, the EPC must be renewed if it expires during the tenancy. The purpose of an EPC is to provide potential buyers or tenants with information about the energy efficiency of the property so that they can make an informed decision about their purchase or rental. The certificate also contains recommendations for improving the energy performance of the property, which can be used to negotiate lower energy bills.

The next section provides the rules of letting the property. Using the MEES ( Minimum Energy Efficiency Standard) guidance the property can only be rented if it has an EPC rating of A to E, unless an exemption has been registered. 

The next section is the all important rating.

The rating is split into 4 categories.

  • Score
  • Energy rating
  • Current
  • Potential

The score is a numerical rating with 92+ as the highest and 1 as the lowest.

The Energy rating is a colourful graph ranging from dark green to Red and denoting an alphabetical system to determine a rating. There are as follows;

  • Dark green- A
  • Green-B
  • Light green -C
  • Yellow-D
  • Light orange- E
  • Orange-F
  • Red-G

Current indicates the current and actual rating of your property combining the score and the energy rating e.g. 74 C this would be repeated in a light green colour. 

Potential indicates the rating the property could achieve if certain energy saving measures were implemented. 

In Wales and England the average energy rating for an existing property is 60 D

The next section is a breakdown of the property’s energy performance. Each part of the building is assessed and rated between Very good and Very poor. 

Here is an example of this feature;

On occasions the description will use the phrase “assumed “ this refers to a section of the property where the energy assessor was not able to inspect. e.g. the loft hatch is locked so the assessor was unable to measure the insulation. The software will then automatically default to the building regulations of the period in which the property was built. 

The primary energy use is also highlighted in this section and is measured in kilowatt hours per square metre (kWh/m2).

The primary energy use measures the energy the property requires for lighting, heating and hot water. 

This calculation includes the efficiency of the property’s heating system, power station efficiency for electricity and the energy used to produce the fuel and deliver it to the property.

Next is Environmental Impact rating section. Based on the average occupancy and energy use. Again using the A -G rating system the property is assessed on how much carbon dioxide (CO2) it produces.

The recommendation section of the EPC recommends energy saving improvements that could be carried out to make the property more energy efficient. It will also estimate the cost of the improvement and how  much money you are likely to save per year. The potential improvement to the energy rating ( after each improvement) is also displayed.

Estimated energy use and potential savings is the final energy related section of the EPC,  calculating the yearly energy cost of the property and also the potential savings. This is based on an average households usage of heating, lighting and hot water. 

This section also estimates the energy used to heat the property in kWh per hour per year and also the potential energy saved per year by adding insulation.

Contacting the assessor and accreditation scheme gives the assessor’s details who conducted the EPC and the accreditation scheme that it has been lodged through. 

Other certificates for this property is a bonus section brought in just for the newly created online energy performance certificates allowing the user to look back at previous certificates and note improvements or lack of. 

Our vision is to provide domestic energy assessors a quality online platform to engage with local potential customers.

Equally to give potential customers an easily accessible route to book or make an enquiry to a reliable domestic energy assessor who operates in their local area.


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