The real cost of a handover

A conventional programme separates the building contract from the systems contract. The rationale is procurement clarity: two scopes, two competitive tenders, two prices that can be compared. The cost appears later, and it does not appear in either contract.

It appears as a riser that was sized before the cable schedule existed. As a technical room without the cooling load its equipment will produce. As a cable route that crosses a structural element nobody was asked about. As an equipment plinth cast at the wrong level. Each of these is a variation, and each variation is priced in a position of zero competitive tension, because by then there is only one party who can fix it.

The second cost is schedule. Discovery on site is sequential: the conflict is found, escalated, redesigned, re-approved, re-procured and rebuilt. A conflict found in a coordinated model costs an afternoon. The same conflict found after the slab is poured costs weeks, and the weeks are on the critical path.

The third cost is the one that outlives the project. When the interfaces were never designed, the as-built does not match the installation, and the operator inherits a facility that cannot be maintained without re-surveying it. That cost is paid every year for twenty years.

The structural fix is not better coordination meetings. It is removing the contractual boundary that creates the gap: one organisation holding both the civil design and the systems design, with the interface register as an internal deliverable rather than a commercial negotiation.