- Additional Insured status extends a vendor's liability policy to a client so the vendor's insurance defends and pays for the client on covered claims arising from the vendor's operations.
- The Certificate of Insurance is a reference document. The endorsement — usually a CG 20 series form — is where the actual coverage lives. For high-value contracts, request the endorsement, not just the certificate.
- Verify: correct legal entity in the schedule, correct endorsement forms for ongoing and completed operations, correct policies (GL plus Auto and Umbrella when required), and the required Primary & Non-Contributory basis.
"Name us as Additional Insured" is written into almost every commercial vendor contract in the United States — from million-dollar property management agreements to small janitorial service orders. Yet ask ten vendors what it actually means and you will get ten different answers. Ask ten compliance reviewers to prove Additional Insured status was actually granted on a Certificate of Insurance and most will point at a checkbox rather than an endorsement form.
Additional Insured is not a checkbox. It is a policy endorsement — a physical amendment to the underlying insurance policy that extends coverage from the named insured (the vendor) to a third party (the client, property owner, general contractor, or property manager). The Certificate of Insurance is only a reference document. The endorsement is where the coverage actually lives.
This guide breaks down exactly what Additional Insured is, why every commercial client requires it, the endorsement forms brokers use to grant it, and the specific things compliance teams, vendors, and brokers should verify before accepting a certificate as proof.
What Additional Insured Actually Means
An Additional Insured (AI) is a person or organization added to another party's insurance policy by endorsement, giving them coverage under that policy for liability arising out of the named insured's operations. In practical terms: the vendor's General Liability policy pays to defend and indemnify the client if a claim is brought against the client because of the vendor's work.
The economic logic is simple. A property manager hires a vendor. The vendor's employee slips and injures a tenant. The tenant sues both the vendor and the property manager. Without AI status, the property manager's own policy has to respond. With AI status, the vendor's insurer defends and pays for the property manager as well — up to the vendor's policy limits.
This is why every serious commercial contract requires it. It shifts the financial and defense burden of vendor-caused claims onto the vendor's insurance, exactly where the risk originated.
How Additional Insured Appears on a COI
On an ACORD 25 Certificate of Insurance, Additional Insured is typically indicated in one of two places: the checkbox in the coverage grid marked "ADDL INSR," or free-text in the Description of Operations box at the bottom of the certificate. Neither, on its own, is proof.
The checkbox tells you the broker believes the endorsement exists. The Description of Operations may name the client and the endorsement form number. But the certificate itself contains this disclaimer: "This certificate does not confer any rights upon the certificate holder in lieu of such endorsement." Translated: the certificate is not the coverage. The endorsement is.
For high-value contracts, compliance teams should request a copy of the actual endorsement — usually a CG 20 series form — and verify the client's name matches the required wording in the contract exactly.
“Contractor shall cause Owner, its parent, subsidiaries, affiliates, and their respective officers, directors, employees, and agents to be named as Additional Insureds on Contractor's Commercial General Liability policy on a primary and non-contributory basis using ISO form CG 20 10 04 13 for ongoing operations and CG 20 37 04 13 for products/completed operations, or their equivalents.”
The CG 20 Series: The Endorsement Forms That Do the Work
The Insurance Services Office (ISO) publishes standardized endorsement forms that brokers use to add Additional Insureds to General Liability policies. Contracts frequently name the specific form required. Getting the wrong form is one of the most common compliance failures.
- CG 20 10 — Additional Insured – Owners, Lessees or Contractors – Scheduled Person Or Organization. The classic "named" AI form for ongoing operations. Only covers work while it is being performed.
- CG 20 37 — Additional Insured – Owners, Lessees or Contractors – Completed Operations. Extends AI status to claims arising from work after it has been completed and turned over.
- CG 20 38 — Broadened version of CG 20 10 that also covers acts or omissions of the Additional Insured related to the named insured's work.
- CG 20 33 / CG 20 26 — Blanket Additional Insured forms that automatically grant AI status to any party the named insured has agreed in a written contract to add. Fast for vendors, but many clients reject blanket forms in favor of scheduled endorsements naming them specifically.
Ongoing vs. Completed Operations — Why Contracts Require Both
A property manager hires a roofer. The roofer finishes the job in June. In November, a leak causes water damage in a tenant unit. Ongoing operations AI status ended when the roofer left the site. Only Products/Completed Operations AI status responds now.
This is why nearly every commercial contract requires both CG 20 10 (ongoing) and CG 20 37 (completed operations). The construction, service, and property management industries all deal with claims that surface long after the work is done. Requiring only ongoing operations AI is a compliance mistake that leaves the client exposed for the entire warranty and statute of repose window.
Common Mistakes to Watch For
- Assuming the checkbox proves coverage. It does not. The checkbox reflects the broker's understanding — not the actual policy endorsement.
- Accepting a blanket AI form when the contract calls for a scheduled endorsement naming the client specifically.
- Missing the Products/Completed Operations endorsement entirely. Ongoing-only AI is not compliant with contracts that require completed operations coverage.
- AI status added only to General Liability when the contract also requires Auto Liability AI (common in delivery, hauling, and mobile service contracts).
- AI wording that names the wrong entity — parent company instead of the property-owning LLC, the property manager instead of the owner, the general contractor instead of the developer.
- Endorsements that grant AI status only for the vendor's sole negligence. Most contracts require AI for the vendor's operations, which is much broader.
Best Practices
For vendors: keep a current copy of your CG 20 10 and CG 20 37 endorsements on file. When a client asks for AI status, request the exact legal name of the entity or entities to be named — do not guess. Ask your broker to add the client on a scheduled endorsement (not blanket) if the contract requires it, and confirm both ongoing and completed operations.
For brokers: read the insurance requirements in the contract before issuing the COI. Confirm which endorsement forms are required, whose name goes in the schedule, and whether Auto and Umbrella need AI extensions too. Attach the endorsement copies to the COI package when the contract requires evidence.
For compliance teams: never accept the COI as final proof for high-value contracts. Request the endorsement forms, verify the named entity matches your legal entity exactly, and check that the endorsement covers the operations described in the contract.
Realistic clause examples
Representative wording from commercial vendor agreements. Use as reference only — actual contract language varies by counterparty, industry, and jurisdiction.
“Contractor shall cause Owner, its parent, subsidiaries, affiliates, and their respective officers, directors, employees, and agents to be named as Additional Insureds on Contractor's Commercial General Liability policy on a primary and non-contributory basis using ISO form CG 20 10 04 13 for ongoing operations and CG 20 37 04 13 for products/completed operations, or their equivalents.”
Frequent compliance errors to avoid
- Assuming the checkbox proves coverage. It does not. The checkbox reflects the broker's understanding — not the actual policy endorsement.
- Accepting a blanket AI form when the contract calls for a scheduled endorsement naming the client specifically.
- Missing the Products/Completed Operations endorsement entirely. Ongoing-only AI is not compliant with contracts that require completed operations coverage.
- AI status added only to General Liability when the contract also requires Auto Liability AI (common in delivery, hauling, and mobile service contracts).
- AI wording that names the wrong entity — parent company instead of the property-owning LLC, the property manager instead of the owner, the general contractor instead of the developer.
- Endorsements that grant AI status only for the vendor's sole negligence. Most contracts require AI for the vendor's operations, which is much broader.
Common commercial agreements
Additional Insured extraction, matching, and verification
CoverageReady searches contracts for the specific phrases that trigger Additional Insured requirements — "name as Additional Insured," "additional insured status," "CG 20 10," "CG 20 37," "primary and non-contributory," and dozens of related patterns. It captures the exact wording, the entities that must be named, and any specific endorsement form numbers the contract references.
When the vendor's Certificate of Insurance is uploaded, CoverageReady parses the ADDL INSR checkboxes on the coverage grid and the free-text in the Description of Operations. It compares the entities the contract requires to be named against the entities named on the COI. If the contract requires CG 20 37 completed operations but the certificate only references ongoing operations, that gap is flagged as a Broker Review item with a citation back to the contract clause.
The gap engine treats "policy exists" as necessary but not sufficient. A General Liability policy alone does not satisfy an Additional Insured requirement — the endorsement must be present, the correct entities must be named, and both ongoing and completed operations must be covered when required. CoverageReady logs a confidence score per requirement, and low-confidence extractions are routed to the broker for verification with the source clause attached, rather than being auto-approved.
CoverageReady scans for the specific trigger phrases, endorsement form numbers, and entity references that indicate this requirement, capturing the exact clause and location within the contract.
Every extracted requirement links back to the highlighted clause in the source contract, so reviewers can verify the AI's interpretation without re-reading the full document.
- Requirement
- Additional Insured Explained
- Source clause
- Insurance Requirements §5.2
- Match status
- Pending broker review
High-confidence extractions auto-populate the compliance report. Anything below the confidence threshold is routed to broker review with the source clause attached.
- 1Extract every insurance requirement from the contract with a citation back to the source clause.
- 2Parse the vendor's Certificate of Insurance and endorsements into normalized coverage records.
- 3Compare requirements to coverage record-by-record — limits, endorsements, entities, and evidence.
- 4Flag any gap, mismatch, or low-confidence extraction for broker review before finalizing the report.
Frequently asked questions
Is Additional Insured the same as Certificate Holder?
No. The Certificate Holder is the party who receives the COI as proof of insurance — they get a piece of paper. The Additional Insured is a party actually added to the policy by endorsement — they get real coverage. Every commercial client is a Certificate Holder; only clients specifically endorsed onto the policy are Additional Insureds.
Does Additional Insured status cost extra?
For most commercial General Liability policies, adding scheduled Additional Insureds is either free or a nominal charge. Some carriers charge for each scheduled AI; others include blanket AI at no charge. Auto Liability AI extensions may carry a small additional premium. Talk to your broker before promising specific endorsements in a contract.
Can I use a blanket Additional Insured endorsement instead of a scheduled one?
Only if the contract allows it. Many sophisticated clients — property managers, national retailers, general contractors — specifically require a scheduled endorsement naming their entity. A blanket AI form provides coverage but does not satisfy a contractual requirement for scheduled AI. Read the contract wording carefully.
What if the endorsement covers ongoing operations but not completed operations?
The certificate is not compliant with any contract that requires both. Most commercial service contracts do. Ask your broker to add CG 20 37 (or an equivalent completed operations AI endorsement) and reissue the COI with both forms referenced.
How long should Completed Operations Additional Insured status remain in place?
As long as the contract requires — commonly matching the applicable statute of repose (often 5–10 years depending on the state and the type of work). This means maintaining the endorsement across policy renewals, not just during the year the work was performed.
Additional Insured status extends a vendor's liability policy to a client so the vendor's insurance defends and pays for the client on covered claims arising from the vendor's operations.
The Certificate of Insurance is a reference document. The endorsement — usually a CG 20 series form — is where the actual coverage lives. For high-value contracts, request the endorsement, not just the certificate.
Verify: correct legal entity in the schedule, correct endorsement forms for ongoing and completed operations, correct policies (GL plus Auto and Umbrella when required), and the required Primary & Non-Contributory basis.
Related resources
Continue building expertise with hand-picked references across the CoverageReady Knowledge Center.
- AI-powered extraction of Additional Insured requirements from contracts.
- Automatic comparison of required AI entities against COI Description of Operations.
- Endorsement form verification and gap flagging with contract citations.
See it working on your own contract
Upload a contract or COI and CoverageReady will extract the requirements, compare them to your active certificates, and flag every gap — with citations back to the source.
CoverageReady provides AI-assisted extraction, organization, and compliance tools designed to help users review commercial insurance requirements more efficiently. CoverageReady does not provide legal advice, insurance advice, or policy interpretations. Users should always consult qualified legal counsel or insurance professionals when making contractual or coverage decisions.