In most cases lenders require that you fully insure the property for the total cost of rebuilding it. You need to have it before the funds are released for your mortgage. It covers damage to your property up to the cost of rebuilding it completely. If the property suffers from any structural damage this cover can be used to help you put it right.
You can also include accidental damage by paying little bit extra premium which will cover you for the damage which you yourself might accidentally inflict upon your property.