The whole-house assessment picks from a defined measures list — here it is, with the honest notes competitors skip. Everything could be fully funded for some eligible households — eligibility does not guarantee installation or zero customer contribution.
Loft, cavity wall, solid wall (IWI/EWI), underfloor, room-in-roof and flat-roof insulation — fabric scores drive most packages.
First-time central heating, air-source heat pumps and controls. Like-for-like gas boiler swaps only in narrow repair/replace cases — see ECO4 heating.
Solar PV can feature in qualifying whole-home projects (10kWp cap). Battery storage is not an ECO4 eligible measure; window/door replacement generally isn’t either.
Facts checked 21 August 2026. We link to official sources and show when facts were last verified. If a scheme changes, we update the page.
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