What EPC Rating Do I Need?

EPC Bands Explained

• A (92–100): Most efficient. Near-zero energy. Passivhaus standard
• B (81–91): New builds typically achieve this. Very energy-efficient
• C (69–80): Good efficiency. Target for retrofitting older homes
• D (55–68): UK average. Some improvements would help
• E (39–54): Below average. Minimum for rental properties
• F (21–38): Poor. Cannot legally be rented out (MEES regulations)
• G (1–20): Very poor. Significant energy waste

Legal Requirements

• Selling: EPC required before marketing. Valid for 10 years
• Renting: Minimum band E since April 2020 (MEES). Proposed band C by 2028
• New builds: Must meet Part L 2021 — typically achieve band B

What Affects Your EPC Score

• Walls: Insulation type and U-value (biggest factor for older homes)
• Roof/loft: Insulation thickness (270mm+ mineral wool target)
• Windows: Single, double, or triple glazing
• Heating system: Boiler efficiency, heat pump, or electric heating
• Hot water: Cylinder insulation, solar thermal
• Renewables: Solar PV, heat pumps add significant points

Common Improvements & Typical Score Boost

• Loft insulation (0 to 270mm): +5–10 points
• Cavity wall insulation: +10–15 points
• New A-rated boiler: +5–10 points
• Double glazing: +3–8 points
• Solar PV (4kW): +10–15 points
• Air source heat pump: +15–25 points

Cost of an EPC

An EPC assessment costs £60–120. It must be carried out by an accredited Domestic Energy Assessor (DEA). The certificate is valid for 10 years and can be found at gov.uk/find-energy-certificate.