Aon vs 
Gallagher: How Do They Compare for Umbrella and Excess Liability Insurance?
Aon: umbrella and Excess Liability as separate coverage areas within construction liability. The page does not specify an attachment point, underlying policy, limits or terms for a particular placement. Gallagher: umbrella/excess liability with automobile liability, workers' compensation and general/product liability under its casualty practice, offering "customized excess casualty program design and placement" and non-traditional alternative risk programs, but does not describe specific attachment points, exclusions or triggers. 3,9
What Is Aon?
Aon’s U.S. Commercial Risk terms describe brokerage for certain insurance programs, while its Middle Market page describes a dedicated practice for mid-sized organizations across North America. The public materials reviewed do not identify the licensed producer or insurer for a particular placement. Ask which entity will produce each line and which insurer will issue the policy; request jurisdiction details for the proposed placement and ask how compensation and claim notice work for your account. 1,2
What Is Gallagher?
Gallagher’s technology specialists serve startups through global enterprises, while its executive-risk team supports IPO and M&A needs; small firms seeking one simple digital quote should compare online agencies. 4,5,6,7,8
Read the Gallagher Umbrella and Excess Liability Insurance page
What Is Umbrella and Excess Liability Insurance?
Umbrella or excess insurance adds liability limits above the policies named in the quote after a covered claim exhausts their limits. It may fit if a contract sets higher limits; check which primary policies are listed and any gaps between them. 10,11,12,13,14
Key Differences in Umbrella and Excess Liability Insurance
How the excess layer follows underlying coverage
Aon describes its global construction practice designs and places risk solutions and uses broking experience and a global network across construction insurance lines. For umbrella and excess liability, this is evidence of Aon’s brokered market offering; the page does not identify the insurer for a buyer’s placement. Gallagher describes umbrella/excess liability with automobile liability, workers' compensation and general/product liability under its casualty practice, offering "customized excess casualty program design and placement" and non-traditional alternative risk programs, but does not describe specific attachment points, exclusions or triggers. Ask whether the proposed form follows the underlying wording or adds a stated feature, and identify the policies and exhaustion points it requires. 3 9
Capacity and buyer segment
Aon describes its global construction practice designs and places risk solutions and uses broking experience and a global network across construction insurance lines. For umbrella and excess liability, this is evidence of Aon’s brokered market offering; the page does not identify the insurer for a buyer’s placement. Gallagher describes pre-renewal meetings with a client's finance, HR, operations and risk-management stakeholders, a gap analysis and contract/form review to close coverage gaps between policies, and a dedicated claims and loss-control advocacy group that reviews legacy loss information to build claim-mitigation and loss-prevention programs. Compare the stated industry appetite and available capacity with your operations, then request the actual limit and attachment point for your account. 3 9
Broker or insurer service route
Aon describes its global construction practice designs and places risk solutions and uses broking experience and a global network across construction insurance lines. For umbrella and excess liability, this is evidence of Aon’s brokered market offering; the page does not identify the insurer for a buyer’s placement. Gallagher describes gallagher's Casualty practice places umbrella and excess liability coverage with outside carriers as one line within a broader casualty program; it does not underwrite the policy. Ask who handles underwriting questions, renewal changes and claims advocacy for the layer. 3 9
What to Confirm in Umbrella and Excess Liability Insurance Quotes
- Ask Aon to confirm the quoted coverage trigger, underlying policies and exclusions; its offering says umbrella and Excess Liability as separate coverage areas within construction liability. The page does not specify an attachment point, underlying policy, limits or terms for a particular placement. 3
- Ask Gallagher to confirm the quoted coverage trigger, underlying policies and exclusions; its offering says umbrella/excess liability with automobile liability, workers' compensation and general/product liability under its casualty practice, offering "customized excess casualty program design and placement" and non-traditional alternative risk programs, but does not describe specific attachment points, exclusions or triggers. 9
Aon and Gallagher Review Scores for 2026
These averages can combine ratings for different products, locations, and customer groups, including approximate BBB grade conversions. Read each review for the sources, scope, and calculation.
Aon Review Score
Review Score
3 rated sources
Public ratings for Aon are low: Trustpilot shows 1.2 out of 5 from 782 reviews, and BBB shows 1.6 from five. Aon is a global firm, so those pages mostly reflect other parts of the business, not large U.S. commercial accounts.[4][6][7]
Read Aon reviewsGallagher Review Score
Review Score
3 rated sources
Gallagher has strong Trustpilot feedback and a favorable historical large-commercial survey result. Neither directly measures today’s US small-business service.[2][4][6]
Read Gallagher reviewsAon vs Gallagher Umbrella and Excess Liability Insurance Compared
Aon vs Gallagher: Umbrella and Excess Liability Insurance: documented features by provider
| Criteria | Aon Umbrella and Excess Liability brokerage and risk-advisory offering | Gallagher Umbrella/Excess Liability Insurance |
|---|---|---|
| Role in This Line | Aon says its global construction practice designs and places risk solutions and uses broking experience and a global network across construction insurance lines. For umbrella and excess liability, this is evidence of Aon’s brokered market offering; the page does not identify the insurer for a buyer’s placement. 3Company-reported. Aon’s global construction and infrastructure practice page. This establishes a marketed brokerage/advisory offering, not policy issuance or account-specific placement. | Gallagher's Casualty practice places umbrella and excess liability coverage with outside carriers as one line within a broader casualty program; it does not underwrite the policy. 9Company-reported. Group-level casualty practice page. |
| Issuing 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. 3Not found in reviewed sources. 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. | The casualty practice page does not name the insurer that would issue a given client's umbrella or excess policy. 9Not publicly disclosed. Checked the group-level casualty practice page. |
| Who It’s For | 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. 3Company-reported. Audience described for Aon’s global construction and infrastructure practice. It does not establish U.S. state availability or underwriting eligibility for a placement. | The casualty practice page does not name a target industry, size or minimum premium for umbrella/excess placements; it describes the practice generally as serving clients with a broader casualty program. 9Not publicly disclosed. Checked the group-level casualty practice page on 2026-09-23. |
| Coverage Features | Aon lists Umbrella and Excess Liability as separate coverage areas within construction liability. The page does not specify an attachment point, underlying policy, limits or terms for a particular placement. 3Company-reported. 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. | Gallagher groups umbrella/excess liability with automobile liability, workers' compensation and general/product liability under its casualty practice, offering "customized excess casualty program design and placement" and non-traditional alternative risk programs, but does not describe specific attachment points, exclusions or triggers. 9Company-reported. Group-level casualty practice page; a service description, not a specific policy's insuring agreement. |
| Limits and Retentions | 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. 3Not publicly disclosed. Aon’s global practice page as reviewed 2026-09-30; no quote, bond form or issued policy was reviewed. | The casualty practice page does not publish specific umbrella/excess limits, attachment points or premium ranges; it says program structure, coverage, limits and pricing are designed to fit the client's current and future needs. 9Not publicly disclosed. Checked the group-level casualty practice page. |
| Risk 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. 3Company-reported. Company-reported advisory services on Aon’s global practice page; account-specific service scope is not stated. | Gallagher describes pre-renewal meetings with a client's finance, HR, operations and risk-management stakeholders, a gap analysis and contract/form review to close coverage gaps between policies, and a dedicated claims and loss-control advocacy group that reviews legacy loss information to build claim-mitigation and loss-prevention programs. 9Company-reported. Group-level casualty practice page; described at the practice level across all casualty lines, not exclusively for umbrella/excess. |
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Sources for Aon vs Gallagher Umbrella and Excess Liability Insurance
Sources About Aon
- Commercial Risk Solutions U.S. Brokerage Terms of Service. Aon; Lines 120–127: certain-program broker-of-record scope, consultation, application assistance, client signature and bind instruction, and account administration; lines 140–147: variable and contingent compensation, potential placement incentive, and client request route; lines 206–213: no price guarantee and surplus-lines limitations; lines 229–231: client insurer-notice duty unless separately agreed. Accessed 2026-09-29.
- Middle Market Clients. Aon; Lines 125–132: mid-sized organizations and middle-market framing; lines 165–173: dedicated practice and North America statement; lines 188–224: Commercial Risk capabilities. No numeric company-size cutoff or U.S.-only eligibility rule is stated on the reviewed page. Accessed 2026-09-29.
- 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.
Sources About Gallagher
- Technology Insurance. Gallagher; Introduction; Solutions and coverages for the technology industry: Technology errors and omissions including cyber, Intellectual property insurance, Product liability, Employee benefits; Data-driven insights; global network. Accessed 2026-09-16.
- Insurance for Technology & IT Businesses. Gallagher Small Business; Protection for IT Professionals & Their Technology-Based Businesses; recommended coverage menu, including Surety Bond Programs; Connect With An Advisor. Accessed 2026-09-16.
- Executive and Financial Risk Insurance. Gallagher; Opening (insurance broking and placement); three key services; Directors and Officers; IPO and direct listings; Employment Practices; Fiduciary; Employee Dishonesty (Crime) and Fidelity Bond; Kidnap, Ransom and Extortion; M&A Transactional Insurance. Accessed 2026-09-16.
- Legal Information. Gallagher Small Business; Producer identification immediately above Quick Links. Accessed 2026-09-16.
- Woodruff Sawyer Is Now Gallagher. Gallagher; Opening; Executive and Financial Risk consulting; Continued access to client portals; contact form. Accessed 2026-09-16.
- Casualty Insurance. Gallagher; Holistic approach for better insurance and risk management in casualty: Automobile Liability, Workers Compensation, General/Product Liability, Umbrella/Excess Liability and alternative forms of risk transfer; Robust casualty risk analysis process; Casualty Practice Summary. Accessed 2026-09-23.
Sources for the Umbrella and Excess Liability Insurance Guide
- Liability Insurance. Insurance Information Institute; Heading Umbrella Liability Insurance; sentence Umbrella Liability—also known as Excess Liability Insurance; underlying policies listed with limits; typically GL, auto and employers’ liability; starts when a covered loss exhausts the primary per occurrence limit; Most umbrella policies exclude EPL, professional liability, product recall, workers compensation, asbestos, pollution, war and terrorism. Accessed 2026-09-16.
- Commercial Insurance Guide. California Department of Insurance; Commercial Umbrella; excess over a basic liability policy; auto/CGL/WC or any liability policy can be covered; may respond if basic policy not in force or for gaps; SIR when no underlying. Accessed 2026-09-16.
- Lines of Insurance. California Department of Insurance; Umbrella or Excess Liability Policy: excess limits over existing liability; may provide additional coverages not provided by underlying policies. Accessed 2026-09-16.
- Coverage Hub. Coverdash; Excess & Specialty: Umbrella; Excess Liability. Accessed 2026-09-16.
- Products. Kinro; 09 Umbrella/Excess: additional limits above scheduled underlying policies; when to review; reviewed with. Accessed 2026-09-16.
