Zoopla house price estimates are calculated using historic data and current local trends. Our system is powered by Hometrack, which is the UK's biggest automated valuer of residential property.
To make its calculations as accurate as possible, Hometrack considers:
- Previously sold prices of the property, and when it was sold
- Changes in market value of similar properties sold nearby
- Characteristics of the property, for example, the number of bedrooms
- Local area data, including crime rates and local schools
The data we use is updated every month. The exact date of the update varies depending on where the information is coming from. For example, HM Land Registry, Royal Mail, Ordnance Survey or Registers of Scotland.
Whilst you used to be able to input information about your own property, we found that homeowners tended to overestimate its value. This impacted the accuracy of our estimates.
We really want to get it right, so our calculations are now solely based on impartial data from third party, public organisations.
Data is richer in England and Wales than in Scotland, where a narrower range of data is available, and in Northern Ireland, where it is not published. This makes our estimated ranges more accurate in England and Wales than Scotland and Northern Ireland