The closeout package is, in essence, the handoff between the team that built the data center and the team responsible for running it.
In hyperscale data center construction, most conversations focus on the build: schedule, cost, coordination, and the relentless push to deliver. What receives less attention is what happens the moment construction ends and operations begin.
That transition, commonly referred to as turnover or handover, is often treated as a formality. In my experience, it’s vital.
My role at CYMCOR is centered on cost control and project closeout. That means I ensure financial closeout is processed accurately, that trade documentation is submitted to the owner, and that all required materials are in order as a project winds down. It’s a behind-the-scenes function, but it’s given me a clear view of how directly the operational team’s success depends on the quality of what the construction side delivers at the end of a job.
The Pace Challenge
Hyperscale projects move quickly. A typical base build is currently running somewhere in the range of 18 months, and that timeline often gets compressed further as owners push to accelerate delivery. What makes this particularly demanding is that it’s rarely just one building. Projects are staggered, with new starts following just months behind one another. The pace is constant.
That speed is a remarkable achievement, but it introduces risk. When schedules are compressed, the items most likely to be deferred are the ones that matter most at turnover: documentation, as-builts, commissioning coordination, and operator training.
Closeout
The closeout package is, in essence, the handoff between the team that built the facility and the team responsible for running it. At a minimum, it includes warranty information, points of contact, financial closeout on all trades, and accurate as-built drawings. Each of these serves a specific operational purpose.
As-builts deserve particular attention in data center work. These projects are frequently designed and constructed in parallel, which means the as-designed drawings can diverge significantly from what was actually built. Cooling infrastructure is a clear example. The operational team needs accurate as-builts to understand the final building.
The Handover
Commissioning, typically led by the general contractor, with a third-party agent from the developer providing oversight, runs in parallel with the final stages of construction. At the same time, the incoming operations team is present in the building, observing systems, and working through structured training on the facility’s equipment and controls.
In many projects, the tenant’s fit-out is also underway during this period. Construction is finishing, commissioning is progressing, the operations team is coming up to speed, and the tenant is simultaneously beginning their buildout. The coordination demands are significant, and the margin for documentation gaps or unresolved issues is narrow.
Clean Handover Requirements
The standard is straightforward: the operational team should never have to guess. Closeout documents should be submitted on time and to the right parties. As-builts should reflect what was built, not what was drawn. Warranty and contact information should be complete and accessible. Commissioning results should be documented and clearly handed off. And the operations team should have received thorough training on every major system before they take ownership of the building.
There’s a tendency in construction to measure success by what happens during the build: whether the project came in on schedule, whether it stayed within budget, whether major coordination issues were resolved. Those metrics matter, but the more consequential measure is what happens after the keys change hands. The operational team inherits every decision made, every document prepared, every system commissioned. Their ability to run the facility reliably from day one depends on the quality they receive.
As the hyperscale sector continues to scale, there’s an opportunity for the construction community to take greater ownership of this transition as a core part of what it means to deliver a facility well.
Hooman Rouhi is a Development Manager at CYMCOR, where he focuses on cost control and project closeout for hyperscale data center construction.
