Question to the Department for Energy Security & Net Zero:

To ask the Secretary of State for Energy Security and Net Zero, what estimate she has made of the average cost for retrofitting a single house under the Whole House Retrofit and the Social Housing decarbonisation Fund (a) as budgeted for in the original awarding of the grants and (b) in completed projects.

The Social Housing Decarbonisation Fund (SHDF) Demonstrator builds on the Whole House Retrofit programme to test innovative approaches to retrofitting at scale. SHDF awarded around £179m of Government funding under Wave 1 to improve the energy performance of up to 20,000 social homes, and £778 million of Government funding to see proposed energy performance improvements to around 90,000 social homes under Wave 2.1.

SHDF cost cap policy shows the maximum grant funding permitted for capital costs for retrofit works by starting characteristic of homes, based on the average cost per home. It is available in Section 2.10.2 of the Wave 1 guidance (https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/1016303/shdf-wave-1-competition-guidance.pdf) and Section 2.11 of the Wave 2.1 guidance (https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/1114571/shdf-wave-2.1-competition-guidance.pdf).