BIM to field: how we stopped drilling the same hole twice

Every contractor claims BIM now. The tell is what happens at the workface. If the model lives in the site office while the crews work from printed sections and tribal knowledge, the clash detection was theatre, the clashes just moved from the screen to the slab.

Freeze early, cast in, never core

On our Doha hotel project the services model was frozen to LOD 400 before the first pour, and every sleeve and builder's opening was cast into the structure. The drill-and-fix trade that usually follows the frame up the tower never mobilised. No patched cores, no fire-stopping surprises, no arguments about whose hole that was.

• Corridor services assembled on racks at ground level, craned in as modules
• Bathroom service walls built in a yard, tested, then set as units
• Hanger positions set out by total station straight from the model
• As-builts that are the model, not a memory of it

“The model is only real when the steel agrees with it.”

The honest caveat: this only works when the model is frozen early and the design team holds the line. A model that keeps moving after the slab is poured is worse than no model at all. It is a promise the structure has already broken.