Zoopla property valuation is a bit of a joke they dont come around and value your property they only go of previously sold prices and as property goes up 2% down 3% for example its a very rough guide for if you have had an extention or new garage kitchen so on zoopla wont take this into account unless you tell them also if for example you got a bargain and brought your home for less than market value this also is not taken into account when they come up with there figures