General liability insurance is the commercial policy that pays when a business is held legally responsible for bodily injury to a third party, physical damage to someone else’s property, or a defined set of personal and advertising injuries—like libel, slander, or copyright infringement in an advertisement. It is a third-party policy: it responds to claims brought against the business by customers, vendors, visitors, and bystanders. It does not pay for the business’s own injuries, its own property losses, or the cost of professional advice that turns out to be wrong.

A commercial general liability (CGL) policy is built from three coverage parts, a long list of named exclusions, and two stacked limits—per-occurrence and aggregate—that together decide what actually gets paid at claim time. Coverage A handles bodily injury and property damage. Coverage B handles personal and advertising injury. Coverage C pays limited medical expenses without a finding of fault. The exclusions remove entire categories of risk that belong on other policies. The limits cap how much the carrier will pay on any one claim and across the whole policy year. Reading all three together is the only way to know what the policy will and will not do.

• What is general liability insurance, and what are its three coverage parts?
• What does general liability insurance not cover?
• How do per-occurrence and aggregate limits change what gets paid?
• When is general liability insurance not enough on its own?
• How Avanti Group reviews a general liability program
• Frequently Asked Questions

What is general liability insurance, and what are its three coverage parts?

A commercial general liability policy is the foundation of nearly every business insurance program written in the United States. Almost every leasehold requires it. Almost every customer contract requires it. Almost every certificate of insurance starts with it. The reason is simple: it is the line of coverage that answers when someone outside the business says, you hurt me, you broke my property, or you said something about me that was untrue.

Coverage A is bodily injury and property damage liability. This is the largest part of the policy and the one most owners think of first. It pays for sums the insured becomes legally obligated to pay because of bodily injury or physical damage to tangible property of others, caused by an occurrence during the policy period. A customer who slips on a wet floor in a retail space, a subcontractor who damages a neighboring building during a roof tear-off, a visitor injured by a falling sign at a hospitality property—all are Coverage A claims. The carrier owes both indemnity (the settlement or judgment) and defense (the legal cost to fight the claim, paid outside the limit on most forms).

Coverage B is personal and advertising injury liability. This is a narrower coverage that responds to a defined list of intentional torts: false arrest, malicious prosecution, wrongful eviction, libel, slander, disparagement, copyright infringement in the insured’s advertisement, and misuse of another’s advertising idea. A small business that runs a social media post comparing itself to a named competitor and is sued for trade libel is in Coverage B territory. A landlord sued for wrongful eviction is in Coverage B territory.

Coverage C is medical payments. This pays limited medical expenses (typically $5,000 or $10,000 per person) for bodily injury arising out of the insured’s premises or operations, without any finding of fault. It is a goodwill coverage—the carrier pays a small medical bill without a lawsuit so the matter does not turn into a Coverage A claim. Coverage C is sub-limited and does not respond to lost wages or pain and suffering.

The three coverage parts share a single policy form, share defense rights, and share the policy limits. They are written together because the underlying question is the same: did this business do something that hurt a third party, and is the loss inside the policy’s scope?

What does general liability insurance not cover?

A CGL policy is defined as much by what it excludes as by what it covers. The standard ISO form carries roughly sixteen named exclusions on Coverage A and an overlapping set on Coverage B. The ones that surface most often in Iowa commercial claims:

• Workers’ compensation and employee injury. Bodily injury to an employee arising out of and in the course of employment is excluded from general liability. That risk belongs on the workers’ compensation policy, with a small overflow on employers’ liability inside the WC program.
• Professional services. Mistakes in rendering or failing to render professional services are excluded from CGL. A consulting firm, a tech services provider, an architect, or a healthcare-adjacent business that relies on its GL policy to cover an advisory error is generally not covered. That risk belongs on a professional liability policy.
• Damage to your own product, your own work, and property in your care, custody, or control. A contractor’s CGL does not pay to replace the defective work itself; it pays for the consequential damage that the defective work causes to other property. A bailee who damages a customer’s property held for service or repair faces a care-custody-or-control exclusion that has to be addressed with separate inland marine or bailee’s coverage.
• Pollution. The pollution exclusion is broad and survives most attempts to argue around it. Time-element pollution endorsements and stand-alone environmental policies fill the gap.
• Auto, aircraft, and watercraft. Bodily injury and property damage arising out of the use of an auto, aircraft, or most watercraft is excluded from the CGL and belongs on the commercial auto or aviation/marine policy.
• Contractual liability beyond the insured contract definition. The CGL covers liability the insured assumes in an “insured contract” (leases, sidetrack agreements, easements, indemnity-of-municipality agreements, and similar). It does not cover open-ended assumed liability in vendor or service contracts that go beyond that definition.
• Intentional acts, war, and nuclear. The standard exclusions that appear on nearly every commercial form.

The form-specific exclusions—communicable disease, assault and battery on habitational and hospitality, cyber-triggered bodily injury, punitive damages where state law permits coverage—are layered in on top of the named exclusions. A complete reading of the policy walks the endorsements list line by line. The exclusions that matter for a given operation are the ones that line up with how the business actually makes money; the generic backbone matters less than the carve-outs that touch the day-to-day work. The pattern is the same one Avanti Group flags on every policy review: silence in the policy form is not coverage, and the exclusions list is where the real scope of the program is decided.

How do per-occurrence and aggregate limits change what gets paid?

A CGL declarations page typically shows two stacked liability limits: a per-occurrence limit and a general aggregate limit. The most common written limits for small and mid-market commercial accounts are $1 million per occurrence and $2 million general aggregate, though programs scale up and down from there based on operations, contracts, and underwriting.

The per-occurrence limit is the most the carrier will pay for any one occurrence under Coverage A or Coverage B. A single slip-and-fall, a single property damage event, a single libel claim—each is one occurrence, capped at the per-occurrence number.

The general aggregate limit is the most the carrier will pay across all occurrences during the policy period. Once the aggregate erodes, subsequent claims in the same policy year get pro-rated or denied. A bad claim year can exhaust the aggregate before the renewal date, and the business is then operating with reduced or no liability coverage until the policy resets.

Most CGL forms also include a separate products and completed operations aggregate (often equal to the general aggregate), which acts as its own cap on long-tail claims arising from work the business has finished. For contractors, manufacturers, and product-makers, the products and completed operations aggregate is often more consequential than the general aggregate.

A worked example. An Iowa-based contractor carries a $1 million per occurrence and $2 million general aggregate CGL. A first claim—property damage on a remodel—settles for $400,000. A second claim later in the same policy year—a fall by a homeowner during the same project—settles for $800,000. The aggregate has now absorbed $1.2 million of the $2 million. A third unrelated claim arrives in month eleven of the policy. The remaining aggregate is $800,000, which becomes the practical per-occurrence ceiling for the rest of the year. This is the math underneath every renewal conversation about whether to raise limits or to layer a commercial umbrella on top.

When is general liability insurance not enough on its own?

A CGL policy is the floor of a commercial liability program, not the ceiling. Several common commercial situations sit outside the CGL scope or push past its limits:

• Contracts that require limits above $1 million. General contractors, public-entity contracts, healthcare relationships, and large landlord agreements regularly require $5 million, $10 million, or higher liability towers. The CGL provides the primary layer; a commercial umbrella or excess policy sits on top.
• Professional advice or services. Any business whose deliverable is advice, design, recommendation, or specialized service needs a separate professional liability policy alongside the CGL.
• Auto exposure. A business that operates owned, hired, or non-owned vehicles needs a commercial auto policy. The CGL excludes the entire auto risk.
• Product manufacturing. A manufacturer’s CGL covers some product liability, but the products and completed operations aggregate, exclusions on impaired property, and the breadth of recall exposure often justify a separate product recall policy.
• Cyber and data exposure. Bodily injury and property damage are CGL territory; a data breach, a network outage, or a wire fraud loss is not. Cyber liability is a separate program.
• Property in care, custody, or control. Businesses that hold, service, store, or transport customers’ property need an inland marine or bailee form. The CGL will not respond.

The point of the audit is to identify which of these adjacencies actually apply to the business in front of the policy. A small Iowa retailer with a single storefront and no professional advice exposure is well-covered by a strong CGL and a businessowners property policy. A 30-person consulting firm with national clients and contractual indemnity obligations needs CGL, professional liability, cyber, and an umbrella—at minimum—and a CGL alone is materially under-coverage.

How Avanti Group reviews a general liability program

Avanti Group does not start a general liability insurance review with a market shop. Before any quote, the team runs a Business Risk Diagnostic™—a structured walk through the operation, the contracts the business has signed with customers and vendors, the certificate-of-insurance requirements it has to satisfy, three-to-five years of loss runs, the commercial property schedule attached to the program, and the adjacencies (auto, professional, cyber, umbrella) that the CGL alone cannot answer. The output is a written list of the exposures the in-force CGL actually covers, the exclusions and sublimits that apply, and the gaps that need a different policy.

A CGL purchased without that work is a number. A CGL purchased after that work is a policy with a known scope, known limits, and a documented set of exposures sitting outside it. The premium decision—deductible, per-occurrence limit, aggregate, umbrella attachment point—rests on that foundation. Iowa commercial buyers who treat the CGL as a commodity bought on price routinely discover at the first significant claim that the price was the only thing the program optimized.

Frequently Asked Questions

What is the difference between general liability and professional liability insurance?

General liability covers third-party bodily injury, property damage, and personal and advertising injury. Professional liability covers economic loss caused by errors, omissions, or failure to render professional services as promised. A consultant who damages a client’s office on a site visit triggers general liability; a consultant whose recommendation causes the client to lose money triggers professional liability. Most service businesses need both, written as separate policies.

Does general liability insurance cover employee injuries?

No. Bodily injury to an employee in the course of employment is excluded from the CGL form. Employee injuries belong on the workers’ compensation policy, which covers medical and indemnity benefits under the state’s WC statute, and on the employers’ liability section of the WC policy for tort-style claims outside the WC system.

How much general liability insurance does an Iowa business need?

The minimum is whatever the business’s contracts require. Many lease agreements, vendor agreements, and customer contracts in Iowa specify $1 million per occurrence and $2 million aggregate as a starting point. Contracts in regulated industries, public-entity work, and larger commercial relationships routinely require $5 million or higher, satisfied through a CGL primary layer plus a commercial umbrella. The right limit is the higher of contractual requirement and underwriter-recommended exposure capacity—not whichever quote came in lowest.

What is an additional insured on a general liability policy?

An additional insured is a third party (landlord, general contractor, customer, vendor) added to the CGL policy by endorsement so that the policy responds to claims brought against that third party arising out of the named insured’s work. Additional insured status is contractually required in most commercial leases and construction agreements. The endorsement form number, the scope of coverage (ongoing operations only, or ongoing and completed operations), and whether the additional insured is granted primary and non-contributory status all matter and should be reviewed before binding.

Does general liability insurance cover damage to my own building or equipment?

No. The CGL is a third-party liability policy. Damage to property the business owns, rents, leases, or holds in care, custody, or control is excluded from the CGL and belongs on commercial property, inland marine, or business owner’s policy property coverage instead. The CGL pays when the business damages someone else’s property, not when the business’s own property is damaged.

Related reading

Other articles in the Commercial Foundations series:

• How to Demand and Verify Certificates of Insurance from Subcontractors — A COI is a snapshot, not a contract — three endorsements turn it from paperwork into protection.