All data related to Age of the property is the biggest single factor in energy efficiency of homes

Results of logistic regression analysis of factors associated with the energy efficiency of housing in England and Wales, up to March 2021. These data explore the impact different characteristics, such as age and property type, have on the likelihood of a dwelling having an energy performance certificate rating of C or higher.

Data from the Opinions and Lifestyle Survey (OPN), on domestic energy efficiency in Great Britain, collected between 22 September and 3 October 2021. Questions cover energy in the home, and attitudes to improving energy efficiency in the home.