Definition:Commercial general liability (CGL)
📋 Commercial general liability (CGL) refers to the standard coverage form — originally developed by the Insurance Services Office (ISO) — that provides businesses with protection against third-party bodily injury, property damage, and personal and advertising injury claims arising out of their operations, products, or premises. The CGL form is the backbone of commercial lines liability underwriting in the United States and serves as the starting point from which carriers build tailored programs through endorsements and manuscript modifications. Nearly every commercial policy portfolio begins with a CGL form, making it one of the most widely issued and litigated coverage documents in the industry.
⚙️ The standard CGL policy is divided into three main coverage sections — Coverage A for bodily injury and property damage liability, Coverage B for personal and advertising injury liability, and Coverage C for medical payments. It can be written on an occurrence basis, which covers events happening during the policy period regardless of when the claim is made, or on a claims-made basis, which responds only to claims first reported during the policy period. Key exclusions — such as those for professional services, pollution, employment-related injuries, and intentional acts — shape the boundary between what the CGL covers and what requires separate, specialized policies. Underwriters evaluate exposures using classification codes, revenue, payroll, and square footage to develop premiums appropriate to each risk.
💡 The CGL form's significance extends well beyond the policy document itself; it functions as a shared language that connects brokers, carriers, adjusters, and defense counsel across the commercial insurance ecosystem. Court interpretations of CGL provisions in one jurisdiction ripple through underwriting guidelines and pricing models nationwide, meaning that a single landmark ruling — on construction-defect coverage or assault-and-battery exclusions, for instance — can shift market behavior for years. For insurtech companies seeking to automate small-business quoting or binding, deep familiarity with CGL form structure and ISO edition history is essential to building products that carriers will trust.
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