13/10/2026
Every setout, level and as-built on a project goes back to one thing: survey control.
If the control points are right, everything built off it lines up. If it's out, the error carries into every pour and every tie-in to existing structures.
Usually nobody notices until something doesn't fit.
On a live site, control marks get bumped, buried and built over.
They have to be established properly, checked regularly and re-observed when something changes.
It's work the project tolerances depends on.