The Hidden Risk in Excess Towers: Why Not All Limits Are Equal

by John Termini 

Excess liability towers are often constructed to achieve a target limit, creating the appearance of straightforward capacity aggregation across the tower. In reality, excess towers introduce structural risks that are frequently underestimated, particularly in complex or long-tail specialty placements.

At placement, that illusion works. The tower meets the target, the pricing clears, and the deal gets done. The problem is that structure isn’t tested at placement. It’s tested years later, under pressure, when claims move up the tower and every assumption starts to matter.

The Weakest Layer Sets the Outcome

The performance of a tower is determined by its weakest layer.

At placement, every layer appears to align. Limits stack cleanly, forms look consistent, and the tower reads as complete. That alignment isn’t tested until later, when claims develop and each layer has to respond on its own.

That’s where alignment starts to break down. On paper, those differences are subtle. In a live claim, they are the difference between a coordinated response and a fractured one.

When one carrier lacks financial resolve, claims authority, or alignment with the rest of the program, the entire tower becomes harder to execute. Settlement delays, breakdowns in defense strategy, and escalation disputes that require escalation to senior claims leadership often trace back to a single weak layer.

Where Towers Actually Break

Most towers look stable at placement. Stress only shows up when losses move through the structure and decisions actually have to be made.

Claims control becomes exponentially more important as losses penetrate higher layers. Disagreements over exhaustion, allocation, and coverage interpretation are inevitable in severe losses. Towers composed of carriers with inconsistent claims philosophies or outsourced claims models tend to break down when cooperation matters most.

Unsupported excess layers introduce additional execution risk. While they have a role in certain placements, they require closer scrutiny. Without a shared underwriting and claims mindset, unsupported layers can delay resolution and bring unnecessary friction into the tower.

Where Execution Risk Shows Up

By the time issues surface, the placement is already set. Coverage is bound, carriers are in position, and flexibility is limited. What looked like a structural detail at placement becomes an execution issue that has to be managed in real time.

For brokers, constructing an excess tower is both a placement decision and a fiduciary responsibility. That responsibility doesn’t end at placement. It extends to how the tower will perform when every layer is called on to respond, not just how it reads at bind.

Selecting carriers purely on price or availability without considering financial strength and claims capability increases execution risk and potential professional liability exposure.

For insureds, the quality of an excess tower often becomes apparent many years after binding, when severity losses mature and claims management is forced to respond in real time.

Excess towers should be constructed deliberately, not opportunistically. Financial strength, underwriting intent, and claims capability should be evaluated at every layer.

In excess insurance, the quality of limits matters as much as their quantity. A tower doesn’t prove itself when it’s built. It proves itself when it’s tested.