Making sense of your Energy Performance Certificate

So what does it all mean? What's in an Energy Performance Certificate?

Your home’s energy efficiency rating and environmental impact (C02) rating is presented on a simple A-G scale where A is Very Good and G is Poor. The average UK property achieves an “E” rating. How does your home fare?

The ratings show the Current energy efficiency performance of your house, and its Potential rating provided you take advantage of the recommendations given.

EPC ratings provide a similar pattern to the certificates found on many domestic appliances.


The summary identifies the key components that affect energy efficiency in your home and how each part is performing.

It rates each element using the following language: Very Poor / Poor / Average / Good / Very Good.


The recommendations tell you what improvements can be made to your house to increase its energy efficiency performance, saving you money and reducing your C02 emissions.

The average potential cost savings are provided for each recommendation and the performance gain if these are implemented.

Additional Information

The Scoring System of the Energy Performance Certificate in more detail: “There are many factors that affect efficiency of a property and therefore the score that can be achieved. Below is a closer look at the various things that have the biggest impact”.

It is important to emphasise that the average score for a property in the UK is currently approximately 47, which falls in the E band. It is also useful to note that different ages of property will have different average ratings. For example, a house built in 1920 will, on average, perform less efficiently than a house built in 1990. This is due to the way that building regulations have significantly improved over time, as has wall construction and general building techniques. Houses built in the last two years have just started achieving around the 82 mark, which falls in the B band.

In addition to this, to achieve an A rated property, the building will be expected to have some kind of energy production technology associated to it (solar photovoltaic panels, solar water heating are examples of this technology, and are currently the only ones that are considered in the EPC. However more ‘green technologies’ such as underground heat pumps will appear in the report in the future.


With thanks to Vibrant Energy.