The Priority Places for Insulation Index (PPII) ranks geographical areas within each nation of the UK across eight different indicators relating to insulation needs. The index is produced by weighting and combining the eight indicators to construct an overall ranking of Priority Places for Insulation within each nation. It has been produced at three levels of geographical: local authorities, parliamentary constituencies and small local areas.

A web tool to display, map and graph the results for your local area can be found at https://insulation.which.co.uk/.

The index was developed by Which?. It was constructed using open data and web-scraped data from the publicly accessible Energy Performance Certificate (EPC) register for Northern Ireland as well as relevant sites where installers can be found or listed. The index is novel because it incorporates both aspects of housing stock and household circumstances which exacerbate the need for insulation.

The following statement should be included when citing the use of this dataset: "The data for this research have been provided by the Consumer Data Research Centre (CDRC), an ESRC Data Investment. Funding references ES/L011840/1; ES/L011891/1. The Priority Places for Insulation Index was developed by Which?."