As built survey is a kind of survey which is collecting data from existing surface or structure. Such data is required to any construction with the adjoining structure. Recording the data of utilities as it is built is also required to prepare drawings.
Some times As built survey is required to calculate the volume or area of a construction or filed. As-built survey is required for re-designing, interior designing, extension of construction and also it required by few authorities such as land department or banks. We are using very sophisticated instruments to record the As built data and providing the drawings as different drawing formats.