EPC Ratings Explained: Understanding A to G

The EPC rating scale runs from A to G, but what do these letters actually mean for your property, your energy bills, and your legal obligations? Here is a detailed breakdown of every rating band.

The Rating Scale

Each EPC rating corresponds to a numerical score out of 100. The higher the number, the more energy efficient the property. The bands are: A (92–100), B (81–91), C (69–80), D (55–68), E (39–54), F (21–38), and G (1–20).

Band A: Outstanding Efficiency (92–100)

These are the most efficient properties, typically new-build homes constructed to the latest building regulations. They feature excellent insulation, modern heating systems such as heat pumps, triple glazing, and often renewable energy sources like solar panels. Energy bills for an A-rated home are minimal.

Band B: Very Good (81–91)

Properties in this band are well-insulated with efficient heating and hot water systems. Many new-build homes achieve a B rating. Older homes can reach this level through comprehensive improvements like external wall insulation, solar PV panels, and high-efficiency boilers.

Band C: Good (69–80)

The government's target is for all homes to reach at least a C rating by 2035. Properties in this band have decent insulation, double glazing, and a reasonably modern heating system. This is an achievable target for many older properties with the right improvements.

Band D: Average (55–68)

The most common rating for UK homes. A D-rated property typically has some insulation but room for improvement. Common upgrades that could boost the rating include loft insulation top-up, cavity wall insulation, a new condensing boiler, and LED lighting throughout.

Band E: Below Average (39–54)

This is the current minimum legal requirement for rental properties under the Minimum Energy Efficiency Standards (MEES). Landlords cannot legally let a property rated F or G unless they have a valid exemption. E-rated homes tend to have older heating systems, poor insulation, and single-glazed windows.

Band F: Poor (21–38)

Properties with an F rating are expensive to heat and maintain. They typically have solid walls with no insulation, outdated boilers, and significant heat loss. Landlords with F-rated rental properties must make improvements or register a valid exemption.

Band G: Very Poor (1–20)

The lowest rating indicates serious energy inefficiency. These are usually very old properties with no insulation, old storage heaters, and major thermal deficiencies. A G-rated property can cost thousands of pounds more per year to heat compared to an A-rated home.

What This Means for You

If you are a landlord, you must ensure your property meets at least an E rating. If you are selling, a higher rating can increase your property's appeal. And if you simply live in your home, understanding your EPC rating is the first step to reducing your energy bills and carbon footprint.