Question to the Department for Energy Security & Net Zero:

To ask the Secretary of State for Energy Security and Net Zero, what proportion of houses assessed for upgrades under (a) ECO3 and (b) ECO4 were eligible to meet the requirements of that scheme.

The Government does not carry out assessments for house upgrades, nor hold data on the number of assessments carried out by suppliers or installers.

While Government sets the eligibility requirements for ECO, the decision on which measures to install and to whom are made by the energy suppliers or installers. These parties may base their assessment on the suitability of the homes from a practical perspective and the cost effectiveness of installing there.

Under ECO3, 1,117,900 measures were installed in around 597,800 unique households.

It is estimated that around 800,000 measures in 450,000 homes will be delivered under ECO4.