Question to the HM Treasury:

To ask the Chancellor of the Exchequer, pursuant to the Answer of 12 March 2024 to Question 16860 on Housing: Valuation, which already available data from third parties was used for the model development.

The Welsh Government has commissioned the Valuation Office Agency (VOA) to carry out a revaluation of all domestic property in Wales. To facilitate this, the VOA has built an Automated Valuation Model which has produced values for 1.46 million properties.

The following external datasets were used:

• Land Registry Price Paid data to supplement VOA sales data
• Land Registry Title Polygons and Ordnance Survey National Geographic Database for plot sizes for houses
• Ordnance Survey Master Map for building footprints for houses
• House Price Index to adjust sales in time
• National Statistics Postcode Lookup (NSPL) to incorporate Census Geography
• Ordnance Survey AddressBase Premium for latest property coordinate data
• Energy Performance Certificates

Additionally, as part of model development, sales verification was undertaken. VOA staff used a range of available data, such as aerial and street view photography, sales particulars, EPC certificates and Local Authority Planning websites to verify the usefulness of the sale.

The VOA has not collected additional codes over and above those already used within England and Wales.

I would observe that this is a policy proposed by the Labour Welsh Government, and does not represent the policy position of the UK Government in England.