The A–G scale
Band A represents the most efficient homes — often modern builds with high insulation and low-carbon heating. Band G indicates poor efficiency and higher typical running costs.
Most UK housing stock sits between bands C and E. Older solid-wall properties without modern heating often rate D or below until improved.
Always refer to the letter band on the certificate, not colour alone, for accessibility and clarity.
Potential rating
The certificate shows a 'potential' rating if recommended measures were installed. This helps owners prioritise cost-effective upgrades.
Potential ratings are modelled — actual results depend on installation quality and how you use the property.
Landlord minimum standards
Private rented properties in England and Wales must meet minimum energy efficiency standards. If your property is below the threshold, you may need improvements before letting.
Speak to a local assessor about practical steps — not every recommendation on the certificate is required for compliance.
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