The Zoopla Estimate is our assessment of the market value of a home on any given day, calculated using a proprietary algorithm that continuously analyses millions of data points relating to property sales and home characteristics throughout the UK The Confidence level indicates the degree of accuracy of the Zoopla Estimate and is based on the amount of data we have for the specific home and for similar properties in the area, as well as the known accuracy of the models in this geography We consistently find our estimates to be the most accurate in the UK market and to be within 10% of the actual transaction price in the majority of cases We combine publicly available data such as sale transactions with our own proprietary data collected from estate agents