During the services installation process, the site team come across several unexpected situations where they require to modify the route or level of the services as per the existing site condition. The site team install the services as per the site condition and the markup those changes on the drawing. After complication of the installation of services, the As-built drawing created on based of site markup drawing.
As-built drawings are the final set of drawings, which contain the existing conditions of the service installed at site. As-built drawings contain every modifications made to the shop drawing.