Read the current certificate first
The EPC records the existing rating, potential rating and modelled recommendations. Review the description of walls, roof, windows, heating, hot water and lighting. If something appears incorrect, gather documents and discuss the evidence with an assessor.
An EPC is an assessment of the building and its fixed services, not a prediction of an individual household's actual bills.
Common areas to investigate
Recommendations vary, but the following areas frequently deserve consideration.
- Loft, roof, wall and floor insulation where suitable
- Heating controls and efficient fixed heating systems
- Hot-water-cylinder insulation
- Double or secondary glazing where appropriate
- Low-energy fixed lighting
- Solar panels or other renewable technology after specialist advice
Plan the sequence carefully
Prioritise measures that fit the building, budget and wider maintenance plan. Check permissions, ventilation, moisture risk, warranties and interactions between improvements. Obtain quotations and appropriate specialist advice rather than relying on modelled EPC costs alone.
Keep evidence of completed work. Product specifications, installer certificates, invoices and photographs can all be helpful when the property is assessed again.
Frequently asked questions
Will one improvement guarantee a higher rating?
No. EPC ratings are calculated from the combined characteristics of the property, and the effect of a measure varies between homes.
Should I get advice before starting work?
Yes. Confirm suitability, cost, permissions and any building-fabric risks with appropriately qualified professionals.