EPC ratings are driven by a specific, assessable set of factors — insulation, heating system efficiency, glazing, and lighting chief among them. Improving the rating means addressing whichever of those is actually weakest on that property, not applying every measure regardless of need.
Measures that typically move the rating
Loft and cavity wall insulation — often the lowest-cost, highest-impact measure where it’s missing.
Heating system upgrades — an old, inefficient boiler or heating controls can weigh heavily on the score.
Glazing — double or secondary glazing where single glazing remains.
Low-energy lighting — a smaller factor individually, but a genuinely low-cost one.
Why order matters
A property missing basic loft insulation usually sees a bigger rating move per pound spent than one that already has it and is missing a more expensive measure like heating system replacement. The efficient order is specific to what a property is actually missing — not a fixed checklist applied the same way to every home.
What a qualified assessor decides that Instilus doesn’t
The final, certified rating after any work is always determined by a qualified domestic energy assessor at a real inspection — Instilus is not a qualified EPC assessor, energy assessor, or installer, and does not certify compliance or issue EPC certificates. Any reference to the proposed 2030 EPC-C standard here reflects the government’s confirmed policy direction, with legislation targeted for 2027 — not yet enacted law.
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