What is umbrella / excess liability insurance?

Coverage that sits on top of underlying policies

Umbrella and excess liability policies do not stand alone. They sit on top ofa business’s primary, or underlying, liability coverage and provide additional limits once the underlying limit is used up. For a subcontractor, the underlying policies are usually:

• Commercial general liability (CGL)—third-party bodily injury and property damage.
• Commercial auto liability—accidents involving the business’s vehicles.
• Employer’s liability—the Part B of the sub’s workers’ compensation policy.

The umbrella only begins to pay after the underlying policy’s limit is exhausted. In effect it raises the ceiling on how much coverage is available for a large claim without the sub having to buy a single very large primary policy.

True umbrella vs. follow-form excess

Although the terms are used loosely, there is a real distinction. A true umbrellacan do more than add limits—it may broaden coverage and even “drop down” to respond to a claim that the underlying policy doesn’t cover (subject to a self-insured retention). A follow-form excesspolicy, by contrast, simply adopts (“follows”) the terms of one specific underlying policy and adds limit on those exact same terms—no broader, no narrower.

For a general contractor reviewing a certificate, this matters because a follow-form excess that sits only over CGL will not add limits to a claim the CGL itself excludes. When precise coverage is important, the policy language—not the certificate label—is what governs.

Schedule of underlying insurance

Every umbrella or excess policy contains a schedule of underlying insurancethat lists the specific policies it sits over and the minimum limits each of those policies must carry. If an underlying policy lapses, is missing, or carries a lower limit than the schedule requires, the umbrella can fail to respond, or the insured may have to self-fund the gap between the actual and required underlying limit. GCs and their brokers check that the sub’s underlying limits actually match the schedule.

How subs use umbrellas to meet a GC’s limits

General contractors often require combined liability limits that exceed a typical primary policy—$2 million, $5 million, or more. Rather than buy one large primary CGL, a subcontractor commonly stacks an umbrella on top of a standard primary policy. A simple example:

• $1,000,000 primary CGL, plus
• $1,000,000 umbrella on top, equals
• $2,000,000 of total limit available for a covered claim.

When a sub relies on an umbrella to hit the required number, the GC should confirm the umbrella also extends the sub’s additional insuredstatus upward, so the extra limit protects the GC too—and should keep an eye on the aggregate limits, since the umbrella typically shares an aggregate that other claims can erode.

How does Wardly help?

Wardly is free COI tracking software built for general contractors. It reads the sub’s ACORD 25, adds up the underlying and umbrella limits to confirm the combined total meets your requirement, checks effective dates, and grades the certificate A–F automatically—so a sub relying on an umbrella to reach your limits doesn’t slip through. Compare it to myCOI and TrustLayer on the comparison hub.

This is general information, not legal or insurance advice.