What is the purpose of having a Full (Structural) Building Survey carried out?

A property may appear in good condition and it can be tempting to assume there are no major problems with it, but there may be costly discoveries upon moving in.  A Full (Structural) Building Survey is carried out to establish that the house is structurally sound and to advise you of current and potential defects; and whether they are expensive, serious, common or to be expected with this type of property.