Deviations found while they are still cheap.

In a data centre tolerance is tight. Cooling, power and network run in redundant paths that must not touch.

A deviation only noticed at handover costs a multiple of what its correction would have cost during the shell phase.

BIM field control ran at short intervals across the entire construction phase. Capture with mobile mapping, evaluation against the coordination model.

Every deviation was recorded with location, dimension and ownership, and reported via BCF into the respective consultant’s tool.

At the end there was an as-built model carrying the built condition.

The construction sequence is documented.

Deviations were captured at intervals before they became variations.