The rebuild cost is not the same as the price you paid when you purchased your property.
The rebuild cost is always lower than the cost of your home as you don't need to take into account the cost of the land that the property is built on.
How to work out your rebuild costs
There are websites available where you can get a free estimate of the rebuild cost of your home. Simply enter your address and postcode and they provide an indication of the rebuild cost of your home.