What does commercial general liability actually cover, and how much do I really need? That's the question we hear most from business owners, and it's the one that gets answered badly most often. The standard answer—"$1 million per occurrence, $2 million aggregate"—is a starting point, not a finish line. We think most small and mid-sized businesses should treat that as a floor and then layer an umbrella on top. Here's how we walk through it with a concrete example.
Imagine you're a general contractor with a $2 million annual payroll
You've got a Business Owner's Policy (BOP) that bundles general liability, commercial property, and business income. That's the common setup; most contracting businesses have one (The Hartford). Your client contracts require at least $1 million in general liability, which is the usual contractual minimum (IRMI). You also do design-build work and give clients advice on site selection—that's where the trouble starts.
Your BOP's general liability side covers third-party bodily injury, property damage, personal and advertising injury, and the legal fees, judgments, and settlements that come with them, up to your limits. It may even pay minor medical expenses for someone hurt at your job site regardless of fault. Product liability is included if you sell or install products, though recall coverage is a separate endorsement. But none of that touches a claim that you gave bad advice.
General liability vs. professional liability: the line that trips people up
General liability covers physical risks—someone slips on your job site, your equipment damages a client's property. Professional liability, often called errors and omissions (E&O), covers financial losses from mistakes in the services you provide. If a client sues you because your cost estimate was wrong or your design advice caused them to lose money, that's an E&O claim, not a GL claim. Professional liability can also respond to claims of negligence, misrepresentation, inaccurate advice, libel or slander, and copyright infringement (The Hartford).
Carrying both is the right move. They don't overlap much, and the claims-made structure of professional liability means you can't just buy it after something goes wrong.
How the limits and defense costs actually work
Here's a distinction that surprises people: on a general liability policy, defense costs are typically paid on top of the policy limit. On a professional liability policy, defense costs are commonly included within the limit (IRMI). That changes your math. If you have a $1 million professional liability limit and spend $300,000 defending a claim, you have $700,000 left for a settlement or judgment. On a GL policy with the same limit, the defense costs don't erode the $1 million.
Professional liability limits commonly start at $1 million per claim, with $2 million to $5 million or more for larger projects. Umbrella policies can add aggregate limits from $1 million to $15 million, the maximum the insurer will pay across all claims in the policy period (The Hartford).
Quick tip: Ask your broker whether defense costs are inside or outside the limit on every liability policy you buy. The answer changes your true coverage by hundreds of thousands of dollars.
Occurrence vs. claims-made: the clock that never stops
General liability is usually occurrence-based: a loss that happens during the policy period is covered even if the claim arrives after the policy expires. Professional liability is usually claims-made-and-reported, meaning the claim must be made and reported while the policy is in force, and the incident must have happened on or after your retroactive date. The extended reporting period—often 30 to 60 days, extendable to a year or more for extra cost—is your tail after you cancel or switch carriers.
Imagine you finish a project in 2024, cancel your E&O policy in 2025, and a client sues in 2026 over advice you gave in 2023. If your retroactive date was 2024 and you didn't buy an extended reporting period, you have no coverage. That's not a technicality; it's the whole ballgame. We see contractors and consultants make this mistake when they change carriers to save a few hundred dollars.
What the market is telling us about limits and pricing
Rates have been softening in many lines, but the liability side is not behaving like the rest of the market. WTW found that general liability and medical malpractice are moving counter-cyclically, with real concerns about social inflation, nuclear verdicts, and litigation funding (Insurance Journal). Settlements and awards rose 27.5% on average between 2010 and 2019, according to the U.S. Chamber Institute for Legal Reform, and the Insurance Information Institute points to third-party litigation funding, plaintiff attorney advertising, rising contingency fees, and eroding damage caps as drivers.
Translation: the frequency of claims may be flat, but the severity is climbing. A $1 million limit that felt generous a decade ago can be consumed by a single bad injury claim. For a contractor with a BOP averaging around $1,687 annually, adding a $1 million umbrella is often a few hundred dollars—cheap relative to the exposure.
- General liability: occurrence-based, defense outside the limit, covers bodily injury and property damage.
- Professional liability: claims-made, defense usually inside the limit, covers financial loss from errors.
- Umbrella: sits above both, but only if the underlying policy exists.
Warning: An umbrella will not extend coverage you don't already have. If you have no general liability policy, you cannot buy a commercial umbrella to fill that gap.
What I'd actually do
I'd carry a $1 million/$2 million CGL as the base, add a professional liability policy at $1 million per claim if I give any advice or design work, and put a $2 million umbrella on top. I'd confirm defense costs sit outside the GL limit and inside the E&O limit, and I'd never let a claims-made policy lapse without an extended reporting period. Then I'd check my certificate of insurance—it's free to obtain, and it should show the coverage types, limits, policy numbers, and effective dates that your clients and lenders actually require.
Sources
- IRMI - https://www.irmi.com/articles/expert-commentary/contractors-professional-liability-and-the-cgl
- The Hartford (General Liability) - https://www.thehartford.com/general-liability-insurance
- The Hartford (Professional Liability) - https://www.thehartford.com/professional-liability-insurance
- Insurance Journal (WTW specialty market rates) - https://www.insurancejournal.com/news/international/2026/05/06/868716.htm
- Triple-I (Legal System Abuse / Social Inflation) - https://www.iii.org/article/social-inflation-hard-to-measure-important-to-understand
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