Additional Insured vs. Certificate Holder: What a COI Proves and What the Endorsement Changes

Construction contracts, commercial leases, vendor agreements and service contracts frequently require one party to show insurance and to extend some liability protection to another. That produces a familiar request: “Send the COI and name us as additional insured.” The phrase sounds simple, but it combines two different functions.

Texas Department of Insurance guidance is unusually clear: a certificate cannot say more than the related policy, and the “Additional Insured” box should be checked only if the policy actually includes an endorsement that names the certificate holder as an additional insured. A certificate holder can ask about policy language or request a copy of the policy, but the certificate itself is evidence, not a substitute for the insurance contract.

Certificate holder, additional insured and named insured

Why the endorsement is the critical document

Additional insured coverage is usually created by an endorsement attached to a liability policy. The endorsement defines who is added, for what operations, during what period, and to what extent. It may limit coverage to liability caused in whole or in part by the named insured’s work, limit the amount available to what a contract requires, exclude professional services, or distinguish ongoing work from completed operations.

A certificate cannot override those restrictions. If the COI description says “ABC LLC is additional insured” but no endorsement grants that status, the certificate language may not create the coverage the contract expected.

What is a blanket additional insured endorsement?

Some policies use a blanket endorsement rather than listing every customer, landlord or project owner by name. Blanket wording commonly activates when the named insured has agreed in a written contract to add another party. The exact trigger differs by endorsement, so the parties should confirm whether the contract was executed before the loss, whether the required relationship fits the endorsement and whether ongoing or completed operations are included.

Texas DOI specifically says a certificate cannot simply identify the certificate holder as additional insured when the policy only contains a blanket endorsement; the certificate may instead state that the policy contains a blanket additional insured endorsement. That distinction prevents the certificate from representing more than the policy actually provides.

Ongoing operations vs. completed operations

Construction-related additional insured requirements often distinguish between claims arising while work is in progress and claims arising after the work is finished. A contract may require both, while a policy may provide only one. This gap may not be obvious on a one-page certificate. The endorsement schedule and wording should be reviewed directly.

Primary and noncontributory wording is a separate issue

Contracts often require the vendor’s insurance to respond on a primary basis without seeking contribution from the customer’s own insurance. Additional insured status does not automatically answer that priority question. “Primary and noncontributory” wording is normally handled through policy terms or a separate endorsement, depending on the form.

A waiver of subrogation is also separate

A waiver of subrogation can limit an insurer’s ability to pursue recovery from a specified party after paying a claim. It is not the same as additional insured coverage. Texas DOI’s certificate guidance treats waiver-of-subrogation representations separately and again requires the certificate to match the actual policy endorsement.

Common contract-compliance mistakes

• Checking the COI box without the endorsement. The certificate should reflect the policy, not promise coverage that is absent.
• Ignoring completed operations. A project may finish long before a liability allegation appears.
• Assuming blanket means automatic. A blanket endorsement can require a written contract or other qualifying condition.
• Confusing limits with rights. A $1 million liability limit does not show which additional insured claims are covered.
• Forgetting the umbrella or excess policy. Additional insured status on the primary policy does not necessarily extend through the entire liability tower.
• Using certificate language to create notice obligations. Cancellation notice rights come from policy, endorsement and applicable law, not from an unsupported certificate promise.

What a contractor or vendor should send

When a customer requests proof of coverage, the cleanest package is often: the approved certificate, the additional insured endorsement or relevant blanket form, any primary/noncontributory endorsement requested, and any waiver-of-subrogation endorsement required by contract. Sensitive policy information can be handled according to the parties’ agreement, but relying on the certificate alone creates avoidable ambiguity.

What a certificate holder should verify

1. Does the named insured on the certificate match the contracting party?
2. Are the policy dates valid for the work period?
3. Are the required lines of coverage and limits shown?
4. Does an endorsement actually grant additional insured status?
5. Does the endorsement cover the right operations and time period?
6. Are primary/noncontributory and waiver requirements separately documented?
7. Does excess or umbrella coverage extend additional insured protection if the contract requires higher limits?

Why this matters at claim time

When a claim is tendered, the insurer reads the policy and endorsements. The certificate can help show what insurance was represented at a point in time, but the defense and indemnity analysis turns on the contract of insurance. Getting the endorsement right before work begins is far easier than arguing about certificate language after an accident.

Reviewed October 5, 2026. Additional-insured rights depend on the actual policy and endorsement; contract and insurance law vary by state.