Following the webinar of Office for National Statistics “Bricks, mortar and data: understanding house and rent statistics”, below are the resources:

ONS produce the UK Average House Price index which is published on HM Land Registry available to download here https://www.gov.uk/government/statistical-data-sets/uk-house-price-index-data-downloads-march-2025. The lowest level is local authority, and this data is at the end of conveyancing, when HMLR have processed the logged sale.