EPC ratings
EPC ratings A–G explained: what do they mean?
Quick answer
An EPC rates a home's energy efficiency from A (most efficient) to G (least efficient), based on a SAP score from 1 to 100+. Band A is 92–100 and band G is 1–20. Band C (69–80) is the standard most rented homes are expected to reach by 2030, so it is widely treated as 'good'.
This guide is general information, not legal advice. EPC band thresholds and the proposed minimum standard for rented homes are subject to change — always confirm the current position on GOV.UK and have an accredited Domestic Energy Assessor assess your property.
Every EPC carries a single letter band and a numeric score that summarise how energy-efficient a home is. Understanding what the bands mean — and the SAP score behind them — helps you judge a property, plan improvements and stay on the right side of the rules.
What do EPC bands A–G mean?
An EPC grades a home from band A to band G. Band A is the most energy-efficient (lowest running costs and carbon) and band G is the least efficient.
The band is a quick visual summary on the certificate. Most homes in England and Wales sit in bands C, D or E.
What SAP score sits behind each band?
Each band maps to a range of SAP (Standard Assessment Procedure) points, from 1 to 100 and above. The higher the score, the better the band.
These are the standard band boundaries used on domestic EPCs in England, Wales and Northern Ireland.
| EPC band | SAP score range | Typical meaning |
|---|---|---|
| A | 92–100 | Very efficient — lowest running costs and carbon |
| B | 81–91 | Efficient — common in newer or well-upgraded homes |
| C | 69–80 | Good — the standard most rented homes are expected to meet |
| D | 55–68 | Average — typical of many older UK homes |
| E | 39–54 | Below average — current minimum to let a home |
| F | 21–38 | Poor — cannot usually be let without an exemption |
| G | 1–20 | Very poor — cannot usually be let without an exemption |
What counts as a 'good' EPC rating?
Band C is widely treated as the target 'good' rating because it is the standard the Government has proposed for privately rented homes by 2030.
Bands A and B are excellent but often need significant investment in older properties. Band D is average; bands E to G usually signal that upgrades are needed.
- Band A–B: excellent efficiency, lowest bills — common in new builds.
- Band C: the practical target for landlords planning ahead.
- Band D: acceptable today but worth improving before 2030.
- Band E–G: improvements likely needed to let lawfully.
How does the band affect letting, selling and MEES?
Under the current Minimum Energy Efficiency Standard (MEES), a home generally cannot be let with an EPC below band E unless a valid exemption is registered.
When selling, a valid EPC is required and buyers increasingly factor the band into the price. The proposed move to band C by 2030 means a higher band is becoming a letting necessity, not just a selling advantage.
Source: MEES landlord guidance, GOV.UK
Related questions
What is the lowest EPC rating you can legally rent?
Currently a home must be at least band E to be let in England and Wales, unless a valid exemption is registered on the PRS Exemptions Register. The proposed standard would raise this to band C by 2030.
Is a higher SAP score better?
Yes. A higher SAP score means a more energy-efficient home, lower running costs and a better letter band. Band A starts at a SAP score of 92, while band G covers scores of 20 or below.
How long does an EPC band last?
An EPC is valid for 10 years from the date it is lodged. The band can change if you make improvements and commission a new assessment, or if assessment methods are updated.
Frequently asked questions
- What is the difference between an EPC band and a SAP score?
- The SAP score is the underlying number from 1 to 100+ that measures energy efficiency. The band (A–G) is the letter grade that the score maps to, giving an at-a-glance summary of the score.
- Can my EPC band go down?
- A lodged EPC keeps its band for 10 years, but a fresh assessment can produce a lower band if assessment methods change or if features recorded differently affect the result. Improvements generally raise the band.
- Can AI-EPC tell me my official EPC band?
- AI-EPC is AI-assisted and helps you interpret an existing certificate and model how improvements might change your band. Any official EPC must be assessed and lodged by an accredited Domestic Energy Assessor — the AI supports planning and never replaces the accredited assessor.
Keep reading
EPC recommendations explained
How to read the recommendations table on an EPC and decide what to do first.
Read guideEPC improvement costs
Indicative costs of common EPC improvements and how to budget a route to band C.
Read guideWhat is RdSAP?
The assessment method behind domestic EPCs, and why your inputs matter.
Read guide