If you are in the process of buying a house or building, especially if it is not new and being sold 'as seen', you will need a competent professional to examine the property for defects and issues which the vendor may not be aware of, or may have neglected to tell you about. The property may even present opportunities and possibilities not seen by yourself or the vendor but which an experienced professional can see.
I have decades of experience in the construction and property markets and I can produce Condition Surveys which tell you what you need to know and are acceptable to lenders and financial institutions.