What information is used for house price estimates in the UK?

House price estimates in the UK are generally built from Land Registry sold price data, local price trends and property attribute data such as number of bedrooms and postcode. The estimate may also take into account broader market movement over time, which can cause the figure to lag behind current conditions. Because the estimate is based on available data rather than a visit, it may miss factors like a new kitchen, an extension, damp issues, presentation, parking changes or nearby development.