Question to the HM Treasury:

To ask the Chancellor of the Exchequer, pursuant to the Answer of 27 November 2024 to Question 15200 on Council Tax: Wales, when the Valuation Office Agency will publish this information.

The Valuation Office Agency (VOA) published the information on gov.uk on 31 March 2025:

How model assisted valuation delivers large-scale property valuations - GOV.UK – A high level overview of how the VOA uses model assisted valuation and mass appraisal to support large-scale valuation. This links through to further information:

External assurance of the VOA automated valuation model (AVM): VOA response - GOV.UK - This page sets out the VOA response to external review and assurance of the VOA AVM developed to support Wales Council Tax reform.

More_information_on_mass_appraisal_and_AVM.pdf - More information on how the VOA is using mass appraisal to support Council Tax reform in Wales and on the AVM.

Model_specification_document.pdf – A document setting out the data utilised in development of the AVM for a future revaluation of Council Tax in Wales, as well as the core spatial regression model specification and an overview of the comparables model.