Overlay
Save energy at home

Guide to Energy Performance Certificates

What is an EPC certificate?

An Energy Performance Certificate (EPC) will tell you how energy efficient a property is and gives it a rating from A to G (an 'A' rating being very efficient).

EPC certificates could help you to buy a home that wastes less energy, show you what your energy bills might be and give you an estimate of the carbon emissions it produces.

If you're not moving home, an EPC certificate could also help you with a range of energy-efficient ideas for your home. Even if you rent, you could still try some of the smaller ideas, such as draught-proofing.

EPC certificates are valid for 10 years from the date the report is produced. 

How does an EPC certificate work?

An EPC report has two main charts with rating bands. These rate a home or property’s energy efficiency using a scale from 1 – 100 giving each band a letter from A to G. The numbers in each rating reflect the government's Standard Assessment Procedure (SAP).

What is a good EPC rating?

‘A’ is a score of 92 – 100, meaning the property is very efficient and has lower running costs. At the bottom of the scale is ‘G,’ with a score of 1 – 20, meaning it’s not energy efficient and has higher running costs. The average energy efficiency rating for a dwelling in England and Wales is band D (rating 60) (Source: Office for National Statistics).

If you're buying a new home, an EPC certificate could help you compare properties you might be looking at, so make sure you ask to see one.

What is included in an EPC certificate?

Not all EPCs will look the same, but the final EPC report will mostly cover the following 4 key areas:

  1. 01

    Estimated energy costs - The first section shows you how much the energy bills for the property will likely cost you, and give you an estimate of how much lower these could be if you improved its energy efficiency. The figures provided for energy use and potential savings are estimates for a typical household in that property – it won't take account of your current energy use.

  2. 02

    Energy performance summary - the EPC report also gives you a detailed breakdown of each energy efficient feature of a property along with a description and energy rating to help you understand its effectiveness. If you’re looking to buy or rent, this could help you compare different properties.

  3. 03

    Recommended measures - if you want to improve your EPC rating, the report provides a list of energy efficient ideas for your home that could help improve it. This includes estimated costs, savings and how much each measure could improve the EPC rating. They are shown in order of importance, and the benefits are based on making the improvements in the order they appear in the report.

  4. 04

    Understanding the EPC report - the final section provides basic information about the EPC report including the date of assessment, the assessor and their accrediting body.

More questions about EPC certificates

Has this article inspired you to take action?

Great, thank you for your feedback

Looking for more ways to save energy?

See how you could save money in the long term with some changes to help make your home more energy efficient.

Can you tell us why?

Thank you

Your feedback helps us to better understand what we're doing well and where we could improve.

Thank you

Your feedback helps us to better understand what we're doing well and where we could improve.

Thank you

Your feedback helps us to better understand what we're doing well and where we could improve.

Moving to an energy efficient future

If you're buying or already have a property with a valid EPC rating of A or B you could be eligible for our Green Mortgage.

NatWest Green Mortgages are available to over 18s purchasing or remortgaging a home with a valid Energy Performance Certificate (EPC) rating of A or B. Product fees may apply. Your home may be repossessed if you do not keep up repayments on your mortgage.