"How much does an EPC upgrade cost?" doesn’t have one honest answer — it depends entirely on how far below the target band a property currently sits. A property one band below C needs a different scope of work than one four bands below.
Indicative cost bands by gap
Already at C or above: no upgrade cost.
Small gap (roughly one band below C): typically £300–£2,000, indicative.
Medium gap: typically £2,000–£6,000, indicative.
Large gap: typically £6,000 up to the government’s proposed £10,000 indicative cap per property.
These are indicative planning ranges built from published typical retrofit-measure costs, never a quotation and never a promise of the final figure — the real cost for a specific property depends on its construction, current measures, and a proper assessor’s survey. Instilus does not provide installation, certification, or qualified assessment services.
Why the £10,000 figure gets misquoted
The £10,000 number circulating online comes from the government’s proposed policy cap per property — an indicative ceiling, not what every upgrade costs. Most properties with a small or medium gap will fall well under it. This entire cost structure sits under the government’s confirmed 2030 policy direction, with legislation targeted for 2027 — not yet enacted law.
See which cost band your own property likely falls into, based on its real recorded EPC data. Check your property’s real EPC band free → no email required
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