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Next publication of UK HPI
The September 2021 UK HPI will be published at 9.30am on Wednesday 17 November 2021. See the calendar of release dates for more information.
Northern Ireland sales volumes
We’ve changed the way we publish the Northern Ireland sales volumes and corrected the way we include them in the UK figures. We’ve produced a monthly estimate by dividing the total sales volumes for the quarter in Northern Ireland by 3.
We previously included the quarterly Northern Ireland data in the monthly UK sales volumes data, which resulted in higher than expected sales figures.
Methodology change for new build property
Because of the impact of the coronavirus (COVID-19) pandemic on both the number and supply of housing transactions, we have made some methodology changes. The processing of new build properties has been more affected than the processing of ‘old build’ properties. To address this, we have had to pool new build transactions for:
January 2021 – includes new build transactions from December 2020 and January 2021 for England and Wales
February 2021 – includes new build transactions from January 2021, and February 2021 for England and Wales
March 2021 – includes new build transactions from January, February and March 2021 for England and Wales
April 2021 – includes new build transactions from February, March and April 2021 for England and Wales
May 2021 – includes new build transactions from March, April and May 2021
June 2021 – includes new build transactions from April, May and June 2021
July 2021 – includes new build transactions from June and July 2021
Due to the nature of processing new builds, these are never included in the model for the first estimate, so August 2021 has not been affected.
These changes might lead to larger revisions to published estimates than usual as we reduce the reliance on pooling. Further information on how we usually process the new build properties can be found in the Quality and Methodology documentation.
Local authority geography change
The UK House Price Index will include the following structural changes to local authorities in England in the August 2021 release (due to be published on 20 October 2021).
Former local authority
New unitary authority
Daventry, Northampton, South Northamptonshire
Wellingborough, Kettering, Corby, East Northamptonshire
See data downloads to download the data in CSV format.