Question

To ask the Secretary of State for Energy and Climate Change, what estimate he has made of the number of homes classified as solid wall construction and built before 1920 that possess fillable cavities.

The English Housing Survey shows there were 4 million homes built in England before 1919 of non cavity wall construction. It is possible that a proportion of these could possess fillable cavities, although no estimate on how many is available.

The tool used to produce the above figure can be accessed from the following link:

https://www.gov.uk/government/publications/cambridge-housing-energy-tool-guidance-note