Aon vs CNA: General Liability Insurance

CNA describes general liability solutions for smaller, mid-sized and large companies, with industry-specific underwriting, risk-control and claims support; Aon's global construction practice places it for contractors, owners and developers.

Montgomery Risk Partners prepared this library from Spot.Insure comparison research and underlying public records.Research updated 2026-09-30

Aon describes construction and infrastructure service for contractors, owners, developers, engineers, architects, and financiers across organizations of varied sizes, while CNA divides its GL solutions by smaller, mid-sized, and large companies.

Sources and records

  1. 01
    Construction and Infrastructure Insurance and Risk Management

    Aon · Construction client audience and global placement role, lines 123–126; offering descriptions lines 135–156; coverage-area taxonomy lines 167–195; contact link lines 120–122. Global practice page; no U.S. state or account-specific placement schedule. · accessed 2026-09-30

  2. 02
    Commercial Insurance Guide

    California Department of Insurance · Commercial General Liability; Commercial Automobile; What Should I Expect from a Broker-Agent?; How Are Commercial Policies Rated? · accessed 2026-09-16

  3. 03
    Commercial General Liability Insurance | CNA Insurance

    CNA · Commercial General Liability; customer sizes, coverage, teams · accessed 2026-09-28

  4. 04
    Commercial general liability insurance

    Insurance Information Institute · Coverage A; Coverage B; Coverage C; Purchasing commercial general liability insurance · accessed 2026-09-16

  5. 05
    Commercial General Liability Coverage Form

    ISO; specimen hosted by Hiscox · I.A pp.1–5; I.B pp.6–7; I.C pp.7–8; Supplementary Payments p.8; II pp.9–10; III p.10; IV pp.10–12 · accessed 2026-09-16

What Are the Key Differences Between Aon and CNA General Liability Insurance?

Project placement reach and CNA’s segment structure

Aon describes construction and infrastructure service for contractors, owners, developers, engineers, architects, and financiers across organizations of varied sizes. CNA divides its GL solutions by smaller, mid-sized, and large companies. That makes scale and project role useful starting points: Aon buyers can discuss a construction-specific placement, while CNA buyers can ask which segment and form fits their company size. [1] [3]

Risk and claims specialists

Aon says its construction advisors help develop risk-transfer and mitigation strategies around project-specific risk. CNA describes industry-specific underwriting and risk-control support plus claims professionals for GL. Those service models are distinct: ask Aon to explain the project advisory deliverable, and CNA to identify which industry specialists will support the submission and any later claim. [1] [3]

What Should You Confirm in Aon and CNA General Liability Insurance Quotes?

  • Ask Aon how it will structure the GL placement for each project and who will lead the risk review. [1] [3]
  • Ask CNA which company segment and industry support team would handle your account. [1] [3]

Provider coverage details

Aon

  • role: Aon says its global construction practice designs and places risk solutions and uses broking experience and a global network across construction insurance lines. For general liability, this is evidence of Aon’s brokered market offering; the page does not identify the insurer for a buyer’s placement. Aon’s global construction and infrastructure practice page. This establishes a marketed brokerage/advisory offering, not policy issuance or account-specific placement.company-reportedSource ↗
  • eligibility: Aon describes its global construction and infrastructure practice as serving contractors, owners, developers, engineers, architects, designers, financiers and investors, and says it works with organizations of varied sizes and complexity. Audience described for Aon’s global construction and infrastructure practice. It does not establish U.S. state availability or underwriting eligibility for a placement.company-reportedSource ↗
  • coverage: Aon lists General Liability within construction liability and describes casualty protection for third-party bodily injury or property damage associated with negligent acts during construction or operations. A policy’s actual insureds, triggers, exclusions and conditions are not stated on this practice page. Aon’s marketing description of the brokerage/coverage area. The page is not the insurer’s policy form and does not establish an insured's entitlement to coverage.company-reportedSource ↗
  • services: Aon describes project risk-advisory services to understand project-specific risks and develop risk-transfer, management or mitigation strategies. It also describes a global construction team and market access. These are company-reported brokerage and advisory services, not coverage benefits. Company-reported advisory services on Aon’s global practice page; account-specific service scope is not stated.company-reportedSource ↗
  • insurer: The reviewed practice page does not name the insurer or producing legal entity for a specific placement. Ask for both on the quote and binder. Aon’s global practice page as reviewed 2026-09-30; no state-specific placement schedule or buyer quote was reviewed. This does not establish that Aon cannot arrange a placement.not-foundSource ↗
  • limits: The reviewed page does not state a buyer-specific limit, retention, deductible or other placement terms. Confirm these in the quote, bond or issued policy. Aon’s global practice page as reviewed 2026-09-30; no quote, bond form or issued policy was reviewed.not-disclosedSource ↗

CNA

  • coverage: CNA Commercial General Liability addresses amounts a business may owe third parties for covered bodily injury or property damage. Entity: CNA brand; issuing CNA subsidiary may vary by product/state Product: United States commercial insurance Jurisdiction: United States Research source scope: US commercial GL Claim limitation: Company-reported; policy wording, underwriting and jurisdiction-specific availability control.company-reportedSource ↗
  • eligibility: CNA identifies GL solutions for smaller companies, mid-sized firms and large firms. Entity: CNA brand; issuing CNA subsidiary may vary by product/state Product: United States commercial insurance Jurisdiction: United States Research source scope: US commercial GL Claim limitation: Company-reported; policy wording, underwriting and jurisdiction-specific availability control.company-reportedSource ↗
  • services: CNA describes industry-specific underwriting/risk-control support and claims professionals for the GL line. Entity: CNA brand; issuing CNA subsidiary may vary by product/state Product: United States commercial insurance Jurisdiction: United States Research source scope: US commercial GL Claim limitation: Company-reported; policy wording, underwriting and jurisdiction-specific availability control.company-reportedSource ↗

Use this comparison as a starting point for a discussion about your business and its insurance needs.

Contact Montgomery Risk Partners