Setting Out

Setting out (site setting out) is the survey process of accurately transferring the building/structure's position, orientation, dimensions, lines and levels from the drawings onto the ground so construction is built in exactly the right place, shape and elevation. It establishes the baseline/grid lines, corner points, column centre-lines, reference pillars and benchmarks, and the formation/finished levels, and is the controlling first activity that every subsequent operation depends on — an error here propagates into every element built afterwards.

It is performed with a total station (or theodolite/level and tape for small works) from established control points and benchmarks, with the layout protected by offset reference pegs/pillars clear of excavation and verified by independent check measurement (diagonals, closing the traverse) before work proceeds. The works must be set out and measured consistent with the drawings and the relevant IS 1200 method-of-measurement provisions; setting-out tolerances, the control framework and verification are defined in the survey method statement, and a setting-out check is a standard hold/witness point in the QA plan.