An as-built survey is a detailed record of a building’s dimensions, features, and locations after construction is complete. It’s also known as a “record drawing” or “as-constructed record drawing”. Records the actual building, including any changes made during construction ,Provides a record that can help resolve disputes or legal issues , Compares final measurements to the original engineering plans . As-built surveys are often accompanied by as-built drawings or models, which are blueprints that reflect the changes made during construction.