When you receive an Energy Performance Certificate (EPC), you’ll notice key indicators used to represent how energy-efficient your property is. Among them are the energy efficiency classes (A to G) and the E-number (or SAP rating) — both essential to understanding your property’s environmental and financial performance.
🔠 What Are Energy Efficiency Classes (A–G)?
These classes are colour-coded energy efficiency bands displayed on your EPC, ranging from A (most efficient) to G (least efficient):
| Band | Rating | Efficiency |
|---|---|---|
| A | 92–100 | Very efficient |
| B | 81–91 | Efficient |
| C | 69–80 | Average to good |
| D | 55–68 | Fair |
| E | 39–54 | Poor |
| F | 21–38 | Very poor |
| G | 1–20 | Extremely inefficient |
These ratings are used by landlords, sellers, buyers, and renters to compare properties in terms of energy performance and potential running costs.
🔢 What Is the E-Number (SAP Rating)?
The E-number, also known as the SAP rating (Standard Assessment Procedure), is a numerical score between 1 and 100+ that calculates how much energy your home uses and how much it costs. This rating is used to assign your property to one of the A–G classes.
Higher SAP rating = Lower fuel costs and carbon emissions
It considers insulation, heating system, lighting, ventilation, and renewable energy usage
🏡 Why These Ratings Matter
These ratings are especially important when:
Selling or renting your property
Applying for Residential EPCs
Meeting minimum EPC requirements (typically Band E or above for landlords)
Planning energy improvements
📈 Improve Your EPC Score
Learn how to improve your EPC rating by upgrading insulation, switching to LED lighting, or replacing outdated boilers.
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