Solution — Setting out
Building Layout Survey with Total Station Setting Out
Grid lines, column centres, pile points and levels marked on site from your centre-line drawing, then checked again before the pour.
Quick AnswerA building layout survey transfers the architect's centre-line drawing onto the ground. Grid lines, column and pile centres, foundation edges and reference levels are set out with a total station from fixed control. Offset pegs keep the marks alive through excavation, and every set is checked before concrete. For other measured work on the same site, see our total station survey service.
What is a building layout survey, and when is it needed?
It is the step where a drawing becomes positions on the ground, needed each time something is dug, piled or cast. The survey starts before excavation, when grid lines and the outline are marked. It returns for pile points, pile caps and footings, columns at plinth and grid transfer to each floor. Each visit works from the same control, so the building does not drift as it rises.
On small residential sites the mason often sets out with tape, line and a 3-4-5 triangle. That works for one rectangle on open ground. It fails on irregular plots, large footprints, piled foundations where a rig flattens every peg, and buildings that must sit on a setback line.
From drawing to pegs: how the stake-out works
Coordinates are prepared in the office, set out from two control points and proved before handover. On a typical commercial or institutional block, the construction layouts follow this sequence:
- Drawing check: We read the centre-line plan and structural layout together, confirm that grid dimensions add up and raise any clash before going to site.
- Control on site: Two or three control points are fixed outside the excavation zone with a DGPS base station and rover GPS receiver, then tied to the plot boundary. A temporary benchmark is set for levels.
- Stake-out data: Every grid intersection, column centre or pile point gets a coordinate in the site system.
- Setting out: The total station stands on one control point, sights a second and guides the chainman to each point by angle and distance.
- Offset pegs: Grid lines are extended to pegs or profile boards outside the dig, so they can be re-strung after excavation.
- Independent check: Diagonals and grid distances are re-measured, and selected points are re-observed from the second control point.
Levels: plinth, floors and the temporary benchmark
Position is half the job; the other half is height, carried from one benchmark to every footing, plinth beam and floor. The temporary benchmark goes where it will not be disturbed, such as a boundary wall or a purpose-cast block. It is tied to the road level or a known benchmark if your approval drawing refers to one. Plinth, footing and floor heights are then marked as spot levels by auto level. Every run closes on the benchmark within ±2.5 mm per kilometre, which on a building site means a millimetre or two.
For multi-storey work, the grid goes up through small slab openings by total station or plumb. It is checked against the grid below before the next floor's columns are marked.
What we check before concrete goes in
A set-out that nobody checks is only a guess with better equipment, so every stage has its own check.
| Stage | What is checked | How |
|---|---|---|
| Grid set-out | Grid spacings, diagonals, squareness | Taped and instrument distances, re-observation from second control |
| Pile points | Pile centres before boring, and actual centres after | Coordinates against design, deviation listed per pile |
| Footings and pile caps | Shuttering position and top level | Offsets from grid lines, auto level |
| Columns at plinth | Starter bars and column faces | Grid offsets, plumb check |
| Upper floors | Grid transferred through slab | Comparison with grid below |
Pile deviations are worth singling out. The piling specification for your job sets the allowed deviation; our pile-by-pile list of design against actual centres lets the structural engineer decide quickly whether a cap needs redesign.
The errors we catch most are not instrument errors. Typical causes are a mistyped grid dimension or a revised structural layout that never reached site. Others are a column moved on one plan only, or a carpenter measuring from the wrong string. A check against independent control finds all four before the steel is tied. Every discrepancy is reported in writing on the day, with the point number and the size of the difference.
Before the first excavation
Two things must be certain before the excavator starts: the building sits inside your plot, and nothing live lies under the dig. Doubtful boundary pillars should be checked against the title papers first; our page on how long land survey services take explains that step. A building set out perfectly from a wrong boundary is still in the wrong place.
On redevelopment and institutional sites, old water lines, cables and drains often cross the footprint. Register the dig and scan the area; our guide to read Call before You Dig in India covers the alert, and more on GPR survey deliverables shows a scan report. Check neighbouring foundations too where your basement goes deeper.
Visiting crew or full-time site surveyor?
Short or simple jobs suit a visiting crew; large, fast-moving sites save money with a surveyor stationed on site. In Delhi NCR a visiting crew comes for each stage the same day or within 1 working day. A full-time surveyor follows the programme, keeps the control register and catches other trades' errors the same day.
- Layout or stake-out crew: ₹8,000 per crew-day.
- Full-time site surveyor with instrument: ₹1,20,000 per month.
- Total station survey of the plot before design: from ₹10,000 up to 1 acre, ₹3,000 per extra acre.
Rates exclude GST. If a site needs set-out work on more than about fifteen days a month, the monthly surveyor costs less than repeated visits. A four-storey block on open foundations might need eight to twelve crew-days; a piled basement often needs a full-time surveyor through the substructure. Outside NCR, a surveyor based in your city can be on the plinth straight away, within 1 working day at most. Any mobilisation or travel cost, if applicable, appears in the written quote.
What you receive at each stage
A short set-out record, signed on site, plus the coordinate files. Each sheet lists the points set out, the control used, the check results and the engineer who accepted the marks, with a sketch and photos. The coordinate list and an updated DWG follow by email the same or next working day. To book, talk to our project team with the centre-line drawing and site location.
Frequently asked questions
Can you set out from a PDF drawing?
Yes, if it is dimensioned and to scale. A DWG with the grid in site coordinates is faster and safer. It works best on top of our topographic survey and site plan of the plot, with contour lines.
How accurate is total station setting out?
The instrument measures distances to 5 mm + 3 ppm. With good control and careful marking, grid points on a building site are placed within a few millimetres.
Who protects the pegs after you leave?
Your site team. We place offset pegs outside the working zone and record their positions so any lost peg can be reset quickly.
Do you set out piles before or after the rig arrives?
Both: centres are marked before boring and checked again after, because the rig often disturbs the marks.
Can you record the finished building too?
Yes, using the same control we can produce a measured record of what was built; see how our as built survey works.
Do you work on Sundays or night shifts?
On request, where the site allows. Night setting out needs adequate lighting at the target points.
Get a written quote for building layout work
Services for building sites
Written by Saniya Parveen · Technically reviewed by Rahul Rai · Updated 8 November 2026