Umbrella vs Excess Liability Insurance: The Difference, and What to Require From Subs
When a prime contract needs more limit than a sub's general liability carries, the extra comes from an umbrella or an excess liability policy. Both sit on top of the sub's other policies and both appear on the same row of the certificate, but they don't do the same thing. This guide covers the difference, how limits stack, what the certificate can and can't tell you, what to require, and the gaps to look for.
Umbrella and excess liability insurance both add limits above a sub's underlying policies, usually general liability, auto and employer's liability. Excess liability insurance only adds limits, on the same terms as the policy beneath it. An umbrella adds limits and can also cover some claims the underlying policies don't, usually after a retention the insured pays first. On the ACORD 25 both share one row, so the certificate won't tell you which you have or which policies it sits over. Require the limit your prime contract needs, name the underlying policies, and ask for it to follow form on additional insured, waiver of subrogation and primary and noncontributory.
In this guide
Umbrella vs excess: the difference
Both policies pay once an underlying policy's limit is used up. The difference is what happens to a claim the underlying policy doesn't cover at all:
| Excess liability | Umbrella | |
|---|---|---|
| Adds limits above the underlying policies | Yes | Yes |
| Terms | Usually follows the form of the policy beneath it | Its own form, with its own coverage terms and exclusions |
| A claim the underlying policy excludes | Not covered: it can only be as broad as what's below it | May be covered, if the umbrella's own terms reach it |
| What the insured pays first on that claim | Nothing applies, because there's no coverage | A self-insured retention, often $10,000 or more |
| Policies it sits over | Often one policy, sometimes several | Usually general liability, auto and employer's liability together |
In practice the two words are used loosely. Plenty of policies sold as umbrellas behave like follow-form excess, and some excess policies add terms of their own. The name on the certificate tells you less than the policy does. For a GC, the questions that matter are the same either way: how much limit, over which policies, and does it carry your additional insured status and the other contract terms up with it.
How the limits stack
Say your prime contract requires every sub to carry $5M in liability coverage for each claim. A typical sub carries general liability at $1M per occurrence. The usual answer is a $4M umbrella on top: the general liability policy pays the first $1M of a claim, and the umbrella pays the next $4M.
Up to $1M
The sub's general liability pays, as it would without an umbrella.
$1M to $5M
The umbrella or excess policy pays, once the general liability limit is used up.
Above $5M
Nothing of the sub's is left. The rest falls on whoever else is liable, often you.
The umbrella only works if the policies under it are in place at the limits it expects. Umbrella and excess policies list those underlying policies and usually require the insured to keep them. If the sub lets its general liability lapse, the umbrella typically still pays only above where the underlying limit should have been, and the gap below it is uninsured. That's why the expiry date of every underlying policy matters as much as the umbrella's own.
The same stacking works for auto and employer's liability when they're listed as underlying. A large vehicle claim uses up the auto limit, then moves into the umbrella. Workers' comp benefits themselves aren't covered by the umbrella; employer's liability, the part of the workers' comp policy that answers lawsuits, usually is.
What the certificate shows, and what it can't
On the ACORD 25, umbrella and excess share one row. A box marks UMBRELLA LIAB or EXCESS LIAB, another marks OCCUR or CLAIMS-MADE, and the row carries a retention, the policy number, the dates, and two limits: EACH OCCURRENCE and AGGREGATE.
What the row can't tell you:
- Which policies it sits over. A $4M excess over general liability only does nothing for an auto claim.
- Whether it follows form on additional insured, waiver of subrogation and primary and noncontributory. The ADDL INSD and SUBR WVD boxes on the row are the agent's statement; the policy decides.
- How much aggregate is left. The aggregate shown is the full amount for the year, not what other claims haven't used yet.
Those answers come from the sub's broker or the policy's schedule of underlying insurance and its endorsements. Ask for them on large or high-risk work. The COI audit checklist covers the rest of the certificate.
What to require from subs
The limit your prime contract needs
Many commercial projects ask for $1M to $5M of umbrella or excess, scaling with the size and risk of the job. Start from your prime contract's insurance exhibit and pass the same total down.
Name the underlying policies
Require it to sit over general liability, auto and employer's liability, not general liability alone.
Follow form on your contract terms
Require that it covers you as an additional insured, and carries the waiver of subrogation and primary and noncontributory terms the underlying policies give you. Without that, your status can stop at the first $1M.
Occurrence form
The same as the general liability beneath it, so a claim years after the job still finds a policy.
Underlying limits that match
If the umbrella expects $1M general liability underneath, the sub has to keep $1M. A lower underlying limit leaves a hole below the umbrella.
The contract terms the umbrella should carry up each have their own guide: additional insured, waiver of subrogation and primary and noncontributory. The full set of limits is in subcontractor insurance requirements.
Gaps to check for
| Gap | What it looks like |
|---|---|
| An underlying policy lapsed | The umbrella row is current, but the general liability or auto row beneath it expired last month |
| Excess over general liability only | A large vehicle claim uses up the auto limit and finds nothing above it |
| A shared aggregate | The sub's claims on other jobs this year have used up the umbrella before yours arrives |
| Contract terms that stop at the first layer | You're an additional insured on the general liability, but the umbrella doesn't extend it to you |
| A limit that doesn't add up | $1M general liability plus a $2M umbrella, against a $5M requirement |
The first one is the easiest to miss and the easiest to catch: it only takes reading every row's dates, not just the umbrella's. COI tracking software keeps each row on its own dates.
How TrackMyVendor automates this
- The umbrella or excess row is read with its each-occurrence and aggregate limits, policy number and dates, alongside general liability, auto and workers' comp.
- Set a minimum for each limit, and a sub whose umbrella is missing, lapsed or below it shows as Non-Compliant.
- Every row is tracked on its own dates, so an expired general liability under a current umbrella still shows.
Umbrella and excess are read as one line: we don't tell them apart, and we don't check which policies one sits over or whether it follows form. Ask the sub's broker on the jobs where that matters.
See how coverage requirements workEvery layer, on its own dates
Subs and vendors upload their certificates through one link — no account, no portal. Every coverage row is read, checked against your minimums and tracked on its own dates. Your first 25 contractors are free.
Frequently asked questions
What is the difference between umbrella and excess liability insurance?
What is excess liability insurance?
How much umbrella coverage should a subcontractor carry?
Does an umbrella policy cover additional insureds?
Is the umbrella aggregate per project?
This guide explains how umbrella and excess liability insurance commonly work. It isn't insurance or legal advice: these policies are insurers' own forms, and drop-down coverage, retentions and who counts as an insured vary. The policy and your contract govern. Ask your broker and attorney about your own requirements.
Insurance on a sub’s certificate
What to require from every sub, one term at a time.
Subcontractor insurance requirements: start here → Coverage, minimums and endorsements to require from subs, with every term below in one table