Commercial Liability Policy Review Guide: What Insurance Agencies Must Know

This commercial liability policy review guide walks through the full structure of a commercial general liability (CGL) policy, section by section, so your agency can identify coverage gaps before a client files a claim. IIABA 2025 data shows that CGL policies have an 8-12% error rate at issuance, and the most common errors cluster around additional insured endorsements, professional services exclusions, and products-completed operations coverage.

These are not obscure technical details. They are the exact issues that generate E&O claims against agencies, and they appear in predictable places every time.

Key Takeaways

• CGL policies carry an 8-12% error rate at issuance per IIABA 2025, with additional insured endorsements being the most frequently cited error category.
• 43% of certificate of insurance rejections stem from missing or incorrect primary/non-contributory language on additional insured endorsements (Applied Systems 2025).
• Products-completed operations coverage is absent or sublimited in 31% of contractor CGL policies, creating direct E&O exposure for the placing broker (Westport Insurance 2025).
• Professional services exclusions in standard CGL forms eliminate coverage for claims arising from advice, design, or consulting, and 27% of service-based businesses operate without a professional liability policy to fill that gap (NAIC 2025).
• Coverage B (personal and advertising injury) is the most frequently triggered liability coverage in retail and media sectors, yet most brokers do not review it at renewal (Swiss Re 2025).
• Aggregate limit erosion is unmonitored in an estimated 68% of small commercial accounts, meaning mid-year claims may have already reduced available coverage below what the client believes (Applied Systems 2025).

The Structure of a CGL Policy: Three Coverage Parts

A standard ISO Commercial General Liability policy (CG 00 01) contains three distinct coverage parts. Each has its own insuring agreement, exclusions, and conditions. Reviewing only one or two of them leaves gaps.

Coverage A: Bodily injury and property damage liability. Coverage B: Personal and advertising injury liability. Coverage C: Medical payments.

These three parts do not share limits. Coverage A has its own occurrence limit and general aggregate. Coverage B and Coverage C operate under separate conditions. Treat them as three separate policies during review.

Coverage A: Bodily Injury and Property Damage

Coverage A is the broadest part of a CGL policy and the one most frequently involved in claims. It pays damages the insured becomes legally obligated to pay because of bodily injury or property damage caused by an occurrence during the policy period.

What to verify in Coverage A:

• Occurrence limit: typically $1 million, but many commercial contracts require $2 million per occurrence. Confirm the limit matches the insured's contractual requirements.
• General aggregate: the maximum the policy pays for all Coverage A claims combined in a policy year. The ISO standard is $2 million. Confirm whether the aggregate applies per location or per project, especially for contractors.
• Products-completed operations aggregate: a separate aggregate that applies specifically to claims arising from completed work or products sold. Westport Insurance 2025 reports this is absent or sublimited in 31% of contractor CGL policies.

The aggregate erosion problem. If the insured has had any claims during the policy year, the general aggregate may already be partially eroded. Applied Systems 2025 data shows that aggregate limit erosion is unmonitored in 68% of small commercial accounts. At renewal, ask the insured for a current loss run and confirm the remaining aggregate.

Exclusions to check in Coverage A:

• Expected or intended injury exclusion: eliminates coverage for intentional acts.
• Contractual liability exclusion (with exceptions): the insured keeps coverage for liability assumed in an "insured contract" as defined by ISO. Verify that client contracts qualify as insured contracts.
• Damage to your work exclusion: eliminates coverage for property damage to the insured's own completed work. This is critical for contractors. The only way around it is a subcontractor exception, which applies only when the damaged work was performed by a subcontractor.
• Damage to your product exclusion: eliminates coverage for the cost of repairing or replacing the insured's defective product itself.
• Professional services exclusion: see the dedicated section below.

Coverage B: Personal and Advertising Injury

Coverage B protects the insured against claims of false arrest, malicious prosecution, wrongful eviction, slander, libel, copyright infringement in advertising, and misappropriation of advertising ideas.

Swiss Re 2025 identifies Coverage B as the most frequently triggered liability coverage in retail and media sectors. Despite this, most brokers do not review it at renewal.

What to read in Coverage B:

• The definition of "personal and advertising injury" in the definitions section. ISO's definition includes seven specific offenses. Coverage applies only to those seven. Claims that fall outside the list are not covered.
• Exclusion for knowing violation of another's rights: eliminates coverage when the insured knowingly commits the offense.
• Exclusion for breach of contract: Coverage B does not respond to contract disputes over advertising rights.
• Exclusion for quality or performance of goods in advertising: if the insured makes false statements about the quality of its own goods, Coverage B does not apply.
• Exclusion for infringement of copyright, patent, trademark: Coverage B covers copyright infringement in advertising only, and specifically excludes patent and trademark infringement. Businesses with active trademark portfolios need standalone IP insurance.

Advertising injury gap for digital businesses. The ISO CG 00 01 form was drafted before social media existed. Claims arising from website content, social media posts, and digital advertising often fall into coverage ambiguity. Confirm whether the insured has a cyber liability policy that addresses media liability for digital content.

Coverage C: Medical Payments

Coverage C pays medical expenses for bodily injury caused by an accident at the insured's premises or by the insured's operations, regardless of fault. The standard limit is $5,000 per person.

Coverage C is not defense coverage. It is a goodwill payment mechanism designed to resolve minor injury claims before they escalate to litigation.

What to check: Confirm that Coverage C has not been excluded or removed by endorsement. Some carriers exclude it for certain high-risk operations. Also confirm whether the insured's industry triggers any per-person limit requirements in client contracts, as $5,000 is often well below contractual minimums.

Additional Insured Endorsements: The Most Error-Prone Section

Additional insured endorsements generate more CGL review errors than any other section. Applied Systems 2025 reports that 43% of certificate of insurance rejections stem from missing or incorrect primary/non-contributory language.

Blanket vs. scheduled additional insureds.

A blanket additional insured endorsement (ISO CG 20 10 or CG 20 37) extends additional insured status automatically to any party required by written contract. A scheduled additional insured endorsement names specific parties.

Blanket endorsements are more common and more practical for contractors and vendors with many contract counterparties. But not all carriers include blanket AI endorsements in the base policy. Verify whether the endorsement is present and whether its language matches the contractual requirement.

The primary/non-contributory requirement.

Most commercial contracts require the insured's policy to be primary and non-contributory with respect to the additional insured's own insurance. This means the insured's CGL must pay first, without contribution from the additional insured's policy, even if the additional insured's policy is also available.

ISO's standard additional insured endorsements do not automatically include primary/non-contributory language. A separate endorsement is required: ISO CG 20 01 (Primary and Noncontributory endorsement). Without it, the certificate of insurance may be rejected, or a claim may result in a coverage dispute between carriers.

The completed operations gap.

ISO CG 20 10 04 13 provides additional insured status for ongoing operations only. ISO CG 20 37 04 13 provides additional insured status for completed operations only. Many contracts require both. If only CG 20 10 is attached, the additional insured has no coverage for claims that arise after the work is finished. Westport Insurance 2025 identifies this as the most common additional insured error in contractor policies.

Products-Completed Operations Coverage

Products-completed operations coverage (PC-Ops) is the part of Coverage A that applies to claims arising from completed work or products after they leave the insured's control.

For contractors, this is often more important than premises liability. A building defect discovered two years after construction is a completed operations claim. A product that causes injury after being sold is a products liability claim. Both fall under PC-Ops.

What to verify:

• PC-Ops aggregate limit: is it separate from the general aggregate, and is it adequate?
• PC-Ops exclusions: the damage to your work exclusion still applies to completed operations. The only coverage for the defective work itself is through a subcontractor exception or a separate builders risk policy.
• Years of coverage: some contractors need products-completed operations coverage extended past the standard policy period to match statute of repose or contractual warranty periods. This requires a tail endorsement.

Westport Insurance 2025 finding: PC-Ops is absent or sublimited in 31% of contractor CGL policies reviewed. The most common cause is incorrect classification at underwriting, where the insured's operations are coded as low-risk service work rather than construction, eliminating PC-Ops by underwriting guideline.

Professional Services Exclusions

Standard CGL policies exclude claims arising from professional services. The exclusion appears in various forms but typically reads: "This insurance does not apply to bodily injury, property damage, personal injury, or advertising injury arising out of the rendering or failure to render any professional service."

NAIC 2025 data shows that 27% of service-based businesses operate without a professional liability policy to fill the gap left by this exclusion.

Who the exclusion affects:

• Architects and engineers (design errors)
• IT consultants (implementation failures)
• Management consultants (advice-based claims)
• Real estate agents and property managers
• Insurance agents (E&O)
• Healthcare providers (professional liability / medical malpractice)
• Accountants and tax advisors

What to do: For any client who provides advice, design, consulting, or professional services, the CGL professional services exclusion creates a gap that only a professional liability (E&O) policy can fill. Document this gap and the client's decision to accept or reject E&O coverage in writing.

What to Check Before Issuing Any Certificate of Insurance

A certificate of insurance (COI) is a representation of coverage, not a guarantee. Issuing an inaccurate COI exposes your agency to E&O claims independent of the underlying policy's accuracy.

Before issuing any COI, verify:

1. Policy status: Confirm the policy is in force and not cancelled or non-renewed.
2. Effective dates: Match the policy period to the dates on the certificate request.
3. Limits: Confirm all listed limits match the current declarations page exactly.
4. Additional insured status: Confirm the requesting party qualifies under the blanket AI endorsement or is specifically scheduled.
5. Primary/non-contributory language: Confirm the endorsement is attached before checking that box on the COI.
6. Waiver of subrogation: Confirm the waiver of subrogation endorsement is attached if the contract requires it. This is not automatic.
7. Umbrella/excess follow form: If the contract requires a stated limit that only the umbrella satisfies, confirm the umbrella follows form to the underlying CGL and that the umbrella also names the additional insured.
8. Description of operations: Do not add coverage or modify the policy in the description box. Any coverage modification in the description that is not supported by an actual endorsement is a misrepresentation.

Applied Systems 2025 reports that COI errors cause 43% of certificate rejections and are a leading source of broker E&O complaints from commercial insureds.

CGL Coverage Gap Analysis by Client Industry

Source: NAIC 2025, Westport Insurance 2025.

CGL Endorsement Checklist

Frequently Asked Questions

What does a commercial liability policy review guide actually cover? A complete commercial liability policy review guide covers all three coverage parts of the CGL form: Coverage A (bodily injury and property damage), Coverage B (personal and advertising injury), and Coverage C (medical payments). It also covers additional insured endorsements, products-completed operations, professional services exclusions, and the steps required before issuing a certificate of insurance.

How do I identify a professional services exclusion in a CGL policy? Look in the exclusions section of Coverage A for language referencing "professional services," "professional advice," or "rendering or failure to render services." Also check for any separate professional services exclusion endorsements attached to the policy. If the insured provides any advisory, design, or consulting services, assume the exclusion applies and check whether an E&O policy is in place.

What is the difference between CG 20 10 and CG 20 37? CG 20 10 provides additional insured status for ongoing operations only. CG 20 37 provides additional insured status for completed operations only. Most construction contracts require both. If only one is attached, the additional insured is exposed during either the active construction phase or after completion, depending on which form is missing.

What does primary/non-contributory mean on a CGL policy? Primary means the insured's policy responds first to a claim, before any other policy available to the additional insured. Non-contributory means the insured's policy does not seek contribution from the additional insured's own policy. These obligations do not exist by default on ISO CGL forms. They require a specific endorsement, typically ISO CG 20 01.

How should I handle aggregate limit erosion during a policy year? Request a current loss run at mid-year for any account with reported claims. Calculate the remaining aggregate by subtracting paid and reserved amounts from the stated aggregate limit. If the remaining aggregate falls below the level required by the insured's contracts, recommend an endorsement to reinstate the aggregate or placement of an excess policy.

What should a broker document before issuing a certificate of insurance? Before issuing any COI, document: policy status confirmation, limits verification against the declarations page, additional insured endorsement form number and effective date, primary/non-contributory endorsement confirmation, waiver of subrogation endorsement confirmation, and any umbrella follow-form verification if the COI lists umbrella limits. Keep this documentation in the insured's file with a date stamp.

Catch policy errors before they become E&O claims →

Written by Javier Sanz, Founder of BrokerageAudit. Last updated April 2026.