Answer
How do I improve my EPC rating?
The biggest EPC wins are insulation (loft, walls), a low-carbon heating system, LED lighting, and solar panels. Moving from D to C often takes insulation plus efficient heating.
In more detail
An EPC assessor scores the fabric and systems of your home. Insulation and a heat pump usually give the largest jumps.
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2026 figures, based on Energy Saving Trust, Ofgem & gov.uk data · always confirm with a professional survey.