After a building is constructed and lot grading completed municipalities require an As-built Lot Grading Plan and Certification prepared by a Lot Grading Professional to certify that grading on the lot is in general conformance with the registered Lot Grading Plan if available and the As-built Lot Grading Plan.An Asbuilt Lot Grading and Drainage Plan Survey is used to provide regulating authorities documention to show property owners and developers are in conformance with grading and drainage best practices and local bylaws to avoid liability from damage to any adjacent or downstream properties.