How to Set Out Building Corners with a Total Station

Applies to: Topcon GT-1003, Trimble S5, Leica TS16, Sokkia CX-105

Building corner layout is one of the most consequential tasks a survey crew performs on a construction project. Errors here propagate through the entire structure — wrong corners mean wrong footings, wrong walls, and potentially a building that encroaches on property lines or fails to meet setback requirements. The workflow below covers the complete process from instrument setup through as-staked verification, for crews setting out new construction footprints using a total station and data collector.

Step 1: Obtain Corner Coordinates from the Plans

Building corners are defined by coordinate pairs (northing and easting) in the project's civil or architectural drawings. Locate the site plan sheet that shows the building footprint referenced to the project control network. Extract the northing and easting for each corner — typically labeled as corner points or column grid intersections. Verify that the coordinate system matches the control on your project (same State Plane zone, same datum).

Import coordinates into the data collector job file from a digital CSV rather than hand-entering them from plan sheets. Hand entry of 20-30 corner coordinates from a complex building footprint is tedious and error-prone. Have a second person verify any coordinates that must be entered manually by reading aloud while the operator keys them in.

Step 2: Set Up the Total Station

Occupy a control point with clear line of sight to the building area. For a new building, this may require setting temporary control hubs at the building perimeter before the excavation starts. See setting up a total station on a known point for the full centering and leveling procedure. Orient with a backsight to a second control point and verify the residual is within 0.01m before beginning stakeout.

For buildings larger than 200 feet in any dimension, consider whether all corners are visible from a single instrument setup. Move the instrument to a second setup if needed — carrying an instrument to a closer position reduces the accumulation of angular error over long distances on large footprints.

Step 3: Stake Each Corner

Using the stakeout routine in the data collector (Trimble Access: Survey > Stakeout; Topcon Magnet Field: Stakeout > Point), select the first corner coordinate. The instrument calculates the turn angle and distance to the target. A rodman walks to the approximate location holding a prism, the operator tracks and measures, and the controller shows the cut/fill and offset from the design point. Direct the rodman in small increments — "move 0.15 feet east, 0.08 feet north" — until the display reads within 0.01 feet of the design coordinate in both axes.

Drive a hub nail (a small nail in a wooden stake top) at the design position. Mark the top of the stake with the point ID. Repeat for all corners. On large buildings, work around the perimeter in order rather than skipping back and forth — this reduces the chance of confusing corner IDs in the controller.

Step 4: Verify with Diagonal and Perimeter Checks

After all corners are staked, check your work with independent measurements. Measure the diagonal distances between opposite corners with a steel tape or the total station. Compare to the plan diagonal distances (calculated as the hypotenuse of the design coordinate differences). A building designed with right-angle corners should have equal diagonals. Discrepancies over 0.05 feet on a small building or 0.10 feet on a large one warrant re-checking the stakeout.

Also shoot a check shot from the total station to one already-staked corner. The measured position should match the design coordinate within 0.01-0.02 feet. This confirms the setup is still valid and the hub was placed correctly.

Step 5: Set Offset Hubs or Batter Boards

Building corner hubs will be disturbed by excavation. Before excavation begins, set offset stakes at a fixed distance from each corner (commonly 5 or 10 feet) in both the wall line and its perpendicular direction. Document the offset distances so corners can be re-established from offset stakes after excavation. Many crews also set batter boards — horizontal boards on posts set back from the corner — with string lines marking the building lines. String line intersections re-establish the corner position without disturbing the soil.