A property surveyor is arranged by title agency to survey the property. The survey is a layout of the property lines and shows all of the improvements (home, garage, driveway, fences, patio, etc.)
The survey provides the legal description of what you are buying and also shows if there are any encroachments, i.e.: improvements that extend over a property line. It also shows any easements on the property as well as any building setback requirements.
As with the title insurance, the cost of the survey is paid by the buyer at closing. The cost is usually $350 for a condominium certificate, $725 for a normal size property, or more for large properties.