You should have the house examined by an architect, structural engineer or building surveyor, provided he or she is experienced in house surveying. People sometimes get a friend who is qualified as an architect/engineer/surveyor to carry out a survey of a property for them sometimes without knowing whether this person has experience of house surveying or practises in an area which gives them the necessary know-how. Others get a tradesman or builder who may or may not have the necessary know-how. A good builder or tradesman with the right experience is probably as good as most surveyors but would not normally furnish a written report and would not usually have professional indemnity insurance.
Our advice is to get a person who not just has paper qualifications but has the necessary experience as well. Experience of problems in buildings over several years enables professionals who regularly carry out surveys to know what problems to look for in different types of houses If you ask a friend or a family member (whatever the qualifications) and they miss something serious, it may be very difficult to take legal action for your loss due to their negligence. The safest course is to use a professional who you could take legal action against without embarrassment.