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Non-Admitted (Surplus Lines) Insurers on a Certificate of Insurance: Should You Accept Them?

By SubCover HQ · Updated Nov 4, 2026 · 2 min read

Sooner or later you'll see a certificate where the general liability insurer is a name you don't recognize, placed through a surplus lines broker. That's common for higher-risk trades like roofing, demolition, and some specialty work. It isn't automatically a problem, but it's worth understanding.

Admitted vs. non-admitted insurers

An admitted insurer is licensed by the state insurance department where the policy is written. Its rates and forms are generally filed with or approved by that state, and in most states its policyholders are protected by the state guaranty fund if the insurer fails.

A non-admitted or surplus lines insurer isn't licensed in that state but is allowed to write coverage there through a licensed surplus lines broker, usually for risks admitted carriers won't take. Surplus lines policies are legal and widely used. The differences that matter to you:

• Guaranty fund protection generally doesn't apply to surplus lines policies, so the insurer's financial strength matters more.
• Policy forms vary more. Surplus lines GL policies more often carry exclusions you won't see on a standard admitted policy, such as exclusions for certain work types, residential projects, or injuries to a sub's own workers' employees.
• Additional insured and other endorsements may be on the carrier's own forms rather than standard ISO forms, so read them instead of assuming.

How to handle surplus lines carriers in your requirements

1. Say what you accept. Many contracts allow non-admitted insurers as long as they meet a minimum A.M. Best rating, commonly A- VII. Some owners require admitted carriers only. Pick one and write it down.
2. Check the rating. See our guide to checking an insurer's A.M. Best rating.
3. Ask for the policy's exclusion list or key endorsements on higher-risk jobs. A certificate won't show exclusions, and some surplus lines exclusions can remove the exact exposure you hired the sub for.
4. Get the actual additional insured endorsement, not just a "Y" in the ADDL INSD column. Our CG 20 10 and CG 20 37 guide explains what to look for.

Spotting a surplus lines policy on a COI

The ACORD 25 doesn't have a checkbox for it. Clues include an insurer you can't find among companies licensed in your state, a surplus lines broker or wholesaler named on the certificate, or a note in the description box. When in doubt, ask the agent whether the policy is admitted or non-admitted.

Key takeaways

Surplus lines coverage is legal and normal for some trades, but it shifts more weight onto the insurer's strength and the policy's wording. Write a clear rule, check ratings, and get the endorsements. SubCover HQ reviews every certificate against your written requirements and flags what needs a closer look, for $99/month.

Frequently asked questions

What is a non-admitted insurer?

An insurer not licensed in the state where the policy is written that is allowed to write coverage there through a licensed surplus lines broker.

Should I accept a surplus lines insurer on a COI?

Many contracts do, as long as the insurer meets a minimum A.M. Best rating such as A- VII. Some owners require admitted carriers only. Write down your rule.

Are surplus lines policies covered by state guaranty funds?

Generally no, which is why the insurer's financial strength rating matters more.

This guide is general information, not insurance or legal advice. Rules on surplus lines vary by state; your insurance professional can advise on your situation.