Every GC chasing mission-critical work is being asked to compress schedules on gigawatt-scale campuses full of owner-furnished prototype equipment. Allianz has now put loss numbers on what that does.
Allianz Commercial published an analysis on August 11 of 221 data center insurance claims totaling roughly €677 million, about $782 million. Fire was the leading driver of loss severity, accounting for well over half of claim value, even though water damage was the most frequent cause by count at 21%, followed by willful acts including crime and cybercrime at 19%, with fire at 14%. Europe accounted for 53% of claims by number and 38% by value; North America accounted for 36% by both.
Commissioning is the peak-risk window
The construction findings are the part worth reading twice. Allianz says compressed schedules, late design changes, retrofitting and prototypical equipment all raise loss likelihood, and it identifies testing and commissioning as one of the highest-risk phases of the entire project.
The reasoning is familiar to anyone who has closed out a complex building. Commissioning is when systems first go live and get pushed near operating limits. It’s also when latent defects surface, when temporary power and temporary cooling are still in place, and when the trade stack is at its thickest. Small errors cascade because multiple contractor interfaces are live simultaneously and nobody owns the seams between the electrical sub, the controls vendor and the owner’s commissioning agent.
Two concrete implications. Hot-work permitting on a data center needs to survive into commissioning rather than lapsing at substantial completion, because hot works shows up in Allianz’s real-claim examples. And a fire watch on an energized rack row is a different hazard than a fire watch on a battery room.
Batteries moved into the racks
That second point follows from a design shift Allianz flags directly: lithium-ion batteries are increasingly installed inside server racks rather than in separate battery rooms. Daniel Schroeder, a senior risk engineer at Allianz Commercial, described it as letting the fox into the henhouse, and noted that damaged cells “can remain dormant for days or weeks before a defect surfaces.”
A dormant defect is a commissioning problem specifically. It means a cell damaged during installation or transport may not fail until after the responsible contractor has demobilized, which is a warranty and subrogation question as much as a safety one.
What changes at bid
Expect builder’s risk underwriters to start pricing commissioning-phase controls explicitly, and to ask for contractor interface plans before binding coverage. That’s a document most mission-critical GCs can produce but few currently produce at bid.
Nothing about this is unique to data centers. Any project commissioning complex systems inside an occupied or high-value environment carries the same interface risk, which is why phased renovations put so much weight on turnover sequencing. The Broad museum expansion is commissioning fire protection and environmental systems around an art storage vault, on a site where the failure cost isn’t measured in downtime.
Two caveats on the figures. All of them come from a single report relayed through trade coverage, and Allianz’s site blocks automated retrieval, so the underlying methodology hasn’t been independently reviewed. Secondary numbers circulating from the same report were not confirmed against the document itself.
Source: Allianz Commercial. Additional reporting at Risk & Insurance.