Unlike many land surveys, done before buildings or other improvements are added to the land or after they are complete, as-built maps are used during the middle of a construction project. As-built maps show improvements to the land, as they exist at a particular point in time.
As-built maps may be used for commercial or residential properties and are crucial in the construction industry from the planning stage to actual construction and future maintenance.
As-built mapping is conducted several times throughout the duration of a construction project. Their frequency and number depend on the scope of the construction project. The purpose of an as-built survey is to verify to local and state governing agencies that the construction work authorized has been completed according to the same specifications set during planning and shown in the site plan. The as-built map is most often used to show the building inspector that a project under construction is conforming to zoning regulations. As-built surveys may be required for nearly every type of land project, from roads and trails to utility improvements and building construction.
An as-built map shows exactly what has been completed to date, a useful tool in adjusting the schedule of a large construction project. As -built mapping provides an important tool for managing the building as it is under construction and after it has been completed.