Checking that what was built matches the model (or updating the model so it does) before it becomes the record that operations rely on for decades.
As-built verification checks that the model represents what was actually built, within an agreed tolerance, before it is handed over as the record model. Buildings never go up exactly as designed: services move around obstructions, products are substituted, site instructions change details. A record model that silently shows the design instead of the building is worse than no model, because people trust it.
Scans of a plant room are compared with the MEP model. 92% of ductwork is within 50 mm of its modelled position; three runs deviate by up to 400 mm where they were rerouted around a beam on site. Those runs are remodelled. The comparison also shows a pump that is in the model but not on site: it had been omitted by a design change that never reached the model. Without the scan, the FM team would have looked for a pump that doesn't exist.
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