Public liability insurance is the coverage that pays when a third party is injured or has their property damaged because of your business. In the United States, it’s sold under a different name — commercial general liability insurance, usually shortened to CGL — and a standard policy carries a $1 million per-occurrence limit with a $2 million aggregate cap. It covers the damages the injured party is owed, and it pays your legal defense costs on top of that.
Public Liability and Commercial General Liability Are the Same Product
“Public liability insurance” is the term used in most countries outside the United States. In the U.S. and Canada, the equivalent product is called commercial general liability, or CGL. The difference is mostly linguistic. Both protect against third-party bodily injury and property damage claims arising from business activities, though a U.S. CGL policy bundles several liability coverages into a single form, making it broader than what some other countries sell under the “public liability” label.
If you’re shopping for coverage in the U.S., ask for general liability or CGL. An agent may not recognize “public liability” as a product name. Most policies follow the Insurance Services Office (ISO) standard form, so the structure is consistent across insurers even though specific terms and pricing vary.
What a Standard Policy Covers
A standard CGL policy is built on three coverage parts, each handling a different category of third-party risk.
Coverage A: Bodily Injury and Property Damage
This is the core of the policy. It pays for damages when someone who isn’t your employee suffers a physical injury or has their property damaged because of your business operations. A customer who slips on a wet floor in your store, a delivery driver whose vehicle is struck by your company truck in a parking lot, a client whose laptop is destroyed when your employee accidentally knocks it off a table — all Coverage A claims. Mental or emotional injuries may also qualify as bodily injury under many policies, even without accompanying physical harm.
Coverage B: Personal and Advertising Injury
Coverage B handles non-physical harm caused by how your business communicates or promotes itself. It includes claims of defamation (libel or slander), copyright infringement in your advertising, misappropriation of another company’s advertising ideas, invasion of privacy, and false arrest or wrongful eviction. A competitor who sues because your ad campaign copies their slogan, or a customer who claims your security team detained them without cause, would trigger Coverage B.
Coverage C: Medical Payments
This is a no-fault provision that pays limited medical expenses for people injured on your premises or by your operations, regardless of whether you were negligent. Coverage C exists to handle small incidents quickly. Someone trips on your sidewalk and needs an X-ray, for example, and the bill is paid without a liability determination. Typical per-person limits are modest, often $5,000 to $10,000, but fast payment can prevent a minor injury from escalating into a lawsuit.
The Duty to Defend
One of the most valuable features of a CGL policy is the insurer’s obligation to defend you against covered lawsuits. The standard ISO policy language states that the insurer has “the right and duty to defend the insured against any ‘suit’ seeking those damages” covered by the policy. That means the insurer pays for attorneys, court fees, and expert witnesses on top of whatever it pays in damages. Defense costs typically don’t count against your policy limits, which is a significant financial benefit. The duty to defend kicks in when a lawsuit is actually filed. Before that point, insurers may choose to help with pre-suit demands but aren’t contractually required to.
What a Standard Policy Does Not Cover
Every CGL policy carves out categories of risk it won’t cover. The exclusions are where businesses get caught off guard.
- Employee injuries. If a worker is hurt on the job, that’s a workers’ compensation claim, not a CGL claim. The CGL policy draws a clear line between employees and the public through its workers’ compensation and employer’s liability exclusions.1International Risk Management Institute. Employers Liability Exclusion in the CGL Policy
- Professional errors. Mistakes in professional advice or services (a consultant’s bad recommendation, an accountant’s miscalculation) require a separate professional liability policy, often called errors and omissions. CGL covers physical and advertising injuries, not the quality of your professional work.
- Intentional acts. CGL covers accidents. If you or an employee deliberately damages someone’s property or causes harm, the policy won’t respond.
- Contractual liability. If you sign a contract agreeing to be responsible for all damages at an event, your CGL policy generally won’t cover claims arising solely from that contractual promise. The exception is liability you would have had even without the contract, which your policy still covers.
- Pollution and environmental damage. Hazardous material contamination, chemical spills, and similar environmental claims are excluded unless you buy a specific environmental liability endorsement.
- Liquor liability. If your business manufactures, sells, or serves alcohol, standard CGL coverage excludes claims arising from intoxicated customers. You need a separate liquor liability policy. Businesses that merely allow alcohol at hosted events without selling it are usually covered under the policy’s host liquor liability provisions.
- Auto liability. Vehicle-related injuries and damage require a commercial auto policy. Your CGL won’t cover an accident involving a company car.
Is It Legally Required?
The federal government does not require businesses to carry general liability insurance. Federal law mandates workers’ compensation, unemployment insurance, and disability insurance for businesses with employees, but general liability is not on that list.2U.S. Small Business Administration. Get Business Insurance Some states impose additional insurance requirements for specific industries, but a blanket CGL mandate doesn’t exist at the federal level.
Even so, general liability insurance is functionally required for most operating businesses. Landlords almost universally require tenants to carry CGL coverage as a lease condition. Government contracts, event venues, and clients hiring contractors routinely demand proof of liability insurance before signing agreements. A business without CGL coverage will find itself locked out of leases, contracts, and opportunities long before any legal mandate becomes relevant.
Policy Limits and Adding More Coverage
A standard policy has two main limits. The per-occurrence limit caps what the insurer pays for any single incident, commonly $1 million. The general aggregate limit caps the insurer’s total payments across all claims during the policy period, typically $2 million.3International Risk Management Institute. How the Limits Apply in the CGL Policy Once the insurer has paid out the aggregate limit, no further coverage exists for the remainder of the policy period, no matter how many additional claims come in.
These limits fix the maximum the insurer pays regardless of how many people are insured under the policy, how many claims arise, or how many lawsuits are filed.3International Risk Management Institute. How the Limits Apply in the CGL Policy Medical payments under Coverage C come out of the same occurrence bucket.
A $1 million per-occurrence limit sounds substantial until you consider a serious injury lawsuit with medical bills, lost income claims, and pain-and-suffering damages. Businesses that want more protection have two options. An excess liability policy simply raises the limits of your existing CGL policy, following the same terms, conditions, and exclusions. It just adds dollars once the primary policy is exhausted. An umbrella policy can both increase your limits and broaden your coverage to include some claims the underlying CGL doesn’t cover, and it can apply across multiple primary policies including general liability, auto, and employer’s liability. Both types activate only after the underlying policy has paid its full limit, and both typically start at $1 million in additional coverage.
What Drives the Premium
CGL premiums aren’t pulled from a standard rate card. Insurers calculate your cost based on factors specific to your business.
- Industry and class code. Every business is assigned a classification code based on its operations. A roofing contractor and a freelance graphic designer present very different risk profiles, and premiums reflect that gap. Construction, hospitality, and manufacturing typically pay more than office-based businesses.
- Annual revenue and payroll. Higher revenue generally means more customer interactions and more exposure. More employees create more opportunities for incidents.
- Premises size and condition. A large, aging retail space with heavy foot traffic is a bigger liability risk than a small, modern office suite. Insurers look at building age, code compliance, and square footage.
- Location. Businesses in high-crime or high-traffic areas pay more. Litigation costs also vary by region, which affects pricing.
- Claims history. Past claims don’t guarantee a rate increase, but they influence your quote. A pattern of similar claims, such as repeat slip-and-fall incidents, signals a risk management problem that insurers will price accordingly.
- Limits and deductibles. Higher coverage limits cost more. A higher deductible lowers the premium but increases your out-of-pocket cost when a claim hits.
For small businesses with less than $1 million in annual revenue, CGL premiums typically run from roughly $700 to $3,000 per year, depending on the industry. Construction businesses and food service operations sit at the high end, while professional service firms pay less. These are ballpark ranges; your actual premium depends on the factors above.
Proving Coverage: Certificates and Additional Insureds
A certificate of insurance (COI) is the standard way to prove you carry CGL coverage. Landlords, clients, event venues, and government agencies routinely request one before doing business with you. The COI lists your insurer, policy number, coverage types, limits, effective dates, and any additional insured parties. Your insurance agent or broker can issue one on request, usually within a day or two.
Many contracts require the other party to be listed as an additional insured on your policy. An additional insured is someone who isn’t the policyholder but receives limited coverage under your CGL for claims arising from your activities. A landlord added as an additional insured would be covered if a customer sues both you and the landlord over an injury at your leased space, but only for liability connected to your operations, not the landlord’s own negligence. This coverage is shared with your own limits, not stacked on top of them, so a large claim involving both parties can stretch the available coverage thin. Adding an additional insured typically requires an endorsement, which your agent handles.
Filing a Claim
When an incident occurs that could lead to a third-party claim, notify your insurer as soon as possible. Most policies require prompt written notice, and delays can create problems. Insurers may argue that late reporting hampered their ability to investigate. Your notice should include the date, time, and location of the incident, what happened, who was involved, and any supporting evidence like photos, witness contact information, or surveillance footage.
After you report the claim, the insurer assigns an adjuster who investigates the facts, reviews your policy terms, and determines whether the claim is covered. The adjuster may visit the incident location, interview witnesses, request medical records or repair estimates, and evaluate whether your business was actually negligent. For bodily injury claims, the insurer sometimes requests an independent medical evaluation to verify the extent of injuries. Cooperate fully with the investigation; providing requested documents quickly keeps the process moving.
Once the investigation is complete, settlement negotiations begin. Straightforward claims with clear liability often resolve quickly. Complex cases involving serious injuries or disputed fault can take months. Review any settlement offer carefully and consider consulting an attorney if the stakes are high. If the insurer denies a claim, it should provide a written explanation identifying the policy provisions it relied on. You can request a formal review, provide additional evidence, or escalate through your state’s insurance regulatory process.
Disputes between policyholders and insurers most often center on whether the policyholder was actually negligent, and whether the policy covers the specific type of claim. An insurer investigating a slip-and-fall at a store entrance will look at whether the business took reasonable steps to maintain safety: Were warning signs posted? Were hazards addressed promptly? Was there a regular maintenance schedule? Courts in most states also apply some form of comparative or contributory negligence, which can reduce or eliminate the claimant’s recovery if they were partly responsible for their own injury. Many CGL policies require mediation or arbitration before either side can file a lawsuit.