The mason will cut fifty penetrations and leave. No one will install the fire stop afterwards because no one ordered it, yet the fire brigade will demand it for the building.
The rack in the basement requires its own protected circuit and an initial inspection. However, no electrician was called because "this is low-voltage work".
Cameras in common areas must be approved by the owners' assembly, and the building becomes the controller of personal data. The company installing them on the wall does not mention this.
None of the companies working in the building combines any of those three tasks. They are linked by a committee, or a supplier who knows what comes next. That is why we do it all.
For every order you receive a schedule with dependencies: when grooves are cut, when scaffolding is erected on the building, when patching work is done and when inspections take place. If one trade is delayed, you immediately see how it affects handover.
Seven items required by the authorities and fire services