Aon vs 
Markel Insurance: How Do They Compare for Builders Risk Insurance?
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
Markel Insurance: Specialty Business and Products
Markel Insurance is Markel Group's specialty and small-business insurance business, with offerings across packages, workers' compensation, cyber, professional and management liability, property, marine, and surety. Products use different insurers and distribution routes, so compare the issuer and terms shown on the specific quote. 4,5
What Is Builders Risk Insurance?
Builders risk protects the project you are building, including materials meant for it, against physical loss until construction ends. The gaps that cost owners money are materials in storage or transit, the existing building in a renovation, and coverage ending when you occupy early. 7,8,9,10
What Are the Key Differences Between Aon and Markel Insurance Builders Risk Insurance?
Project Scale and Term
Markel’s builders-risk page, accessed September 29, 2026, names bridges, dams, tunnels, and power facilities among its engineering exposures. Aon describes a global construction practice for project participants across varied sizes and complexity. For an infrastructure project, compare the stated Markel project classes with the markets Aon would approach; neither description guarantees underwriting acceptance. 6 3
Capacity and Advisory Work
In the page accessed September 29, 2026, Markel stated that coverage periods may extend up to 60 months and that it may write 100% or participate as a subscriber; these are dated program capabilities, not a current quote or commitment. Aon describes project-specific risk advice and global market access but publishes no term or capacity figure in this record. For a long build or a risk needing multiple participants, request confirmed term, share, extension rights, and lead-insurer responsibilities from the actual proposal. 6 3
What Should You Confirm in Aon and Markel Insurance Builders Risk Insurance Quotes?
Aon and Markel Insurance 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 reviewsMarkel Insurance Review Score
Review Score
2 rated sources
There is little public customer feedback on Markel. Trustpilot shows 2.5 out of 5 from just 5 reviews, and BBB lists 12 complaints closed in the last three years.[4][3]
Read Markel Insurance reviewsAon vs Markel Insurance Builders Risk Insurance Compared
Aon vs Markel Insurance: Builders Risk Insurance: documented features by provider
| Criteria | Aon Builders Risk brokerage and risk-advisory offering | Markel builders risk |
|---|---|---|
| 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 builders risk, 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. | Markel offers builders-risk coverage for construction projects from basic four-wall risks to complex infrastructure and power projects. 6Company-reported. Large builders-risk page; specific project underwriting applies. |
| 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. | Confirm in your quote. |
| 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. | Targeted exposures include civil engineering, mechanical engineering and completed civil engineering projects, including bridges, dams, tunnels and power facilities. 6Company-reported. Published target examples; no eligibility guarantee. |
| Coverage Features | Aon lists Builders Risk under construction property and says its construction property offering can address accidental damage to project property or materials during construction and operations. That is a broker’s description of the line, not a grant of coverage for a buyer. 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. | Confirm in your quote. |
| 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. | Markel states coverage periods may extend up to 60 months and that it may write 100% or participate as a subscriber; project-specific capacity must be confirmed. 6Company-reported. Program capability, not a commitment for an individual risk. |
| 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. | Confirm in your quote. |
Related Pages for Aon vs Markel Insurance Builders Risk Insurance
Builders Risk Insurance Pages for Aon and Markel Insurance
Other Coverage Lines Compared for Aon vs Markel Insurance
Other Builders Risk Insurance Provider Comparisons
Sources for Aon vs Markel Insurance Builders Risk 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 Markel Insurance
- About us. Markel; Markel at a glance; description of Markel Insurance within Markel Group Inc. Accessed 2026-09-28.
- Markel Group Inc. 2025 Form 10-K. U.S. Securities and Exchange Commission; filed by Markel Group Inc.; Cover page; Part I, Item 1 Business—Markel Insurance, U.S. Wholesale and Specialty, Programs and Solutions; Part II, Item 7/8 for group and segment risks. Accessed 2026-09-28.
- Builders Risk Insurance. Markel; Coverage features; construction projects and builders-risk scope. Accessed 2026-09-29.
Sources for the Builders Risk Insurance Guide
- Glossary of Insurance Terms. National Association of Insurance Commissioners; Builders’ Risk Policies; Ocean Marine; Auto Physical Damage; All-Risk. Accessed 2026-09-16.
- Commercial Insurance Guide. California Department of Insurance; Commercial Property; Inland Marine; What Should I Expect from a Broker-Agent. Accessed 2026-09-16.
- Builders Risk Coverage Form. Insurance Services Office, Inc.; hosted by Touchpoint Markets; A.1–3 p.1; B.3.c p.11; C,D,E p.12. Accessed 2026-09-16.
- Builders Risk Application Tip Sheet. US Assure; General policy application tips p.1; Remodeling tips p.2. Accessed 2026-09-16.
