A building survey, as it is understood in the U.K., is not necessary in Spain for mortgage purposes. It is nonetheless advisable when purchasing an older property. Common things to check for are the condition of the plumbing and electrical installations, waterproofing, roofing, and so on. These checks, as well as a full structural survey, can be carried out by a Spanish technical architect (aparejador) or indeed by a qualified British Chartered Surveyor. Any fees involved would be to the account of the prospective purchaser.