Who Should Be Listed As Additional Insured Explained: Key Insights for Brokers

An additional insured is a party granted actual coverage rights under another party's policy by endorsement. This is categorically different from a certificate holder, who receives documentation only. When a contract requires a party to be listed as additional insured, the obligation is substantive: the named insured's policy must carry an endorsement - CG 20 10, CG 20 37, CG 20 11, or another ISO form depending on the relationship - that extends defense and indemnity to that party.

The question "who should be listed as additional insured" has a two-part answer: who contracts require it, and who contracts do not. The second part matters as much as the first. Unnecessary additional insureds expand liability exposure and raise premium without serving any coverage purpose.

Key Takeaways

• General contractors require subcontractors to list them using CG 20 10 (ongoing operations) and CG 20 37 (completed operations) on GL policies.
• Landlords require commercial tenants to add them as additional insured using CG 20 11 (Managers or Lessors of Premises).
• Lenders and project owners require additional insured status from borrowers and contractors, respectively, as a condition of the commercial relationship.
• Additional insured status should only be added when the underlying contract explicitly requires it - adding it without a contractual basis increases liability exposure and premium.
• A certificate showing additional insured status without a corresponding policy endorsement creates direct E&O exposure for the agency.
• Blanket-additional-insured endorsements cover all parties with a written contract requiring the status, eliminating the need to schedule each party separately.

Who Typically Requires Additional Insured Status

General Contractors from Subcontractors

Construction is the highest-volume additional insured relationship in commercial insurance. General contractors require subcontractors to name the GC as additional insured as a standard subcontract condition. The specific forms matter: CG 20 10 covers ongoing operations (work in progress), and CG 20 37 covers completed operations (claims arising after the work is done).

Both are typically required together. A subcontractor whose policy has only CG 20 10 leaves the GC unprotected for completed operations claims - construction defect claims that surface after the subcontractor has left the site. Many construction contracts explicitly require both CG 20 10 and CG 20 37 by name.

Contracts also commonly require primary and non-contributory language. This means the subcontractor's GL responds first to claims against the GC arising from the sub's work, without seeking contribution from the GC's own coverage. Primary and non-contributory is a separate endorsement (CG 20 01 or carrier equivalent) added on top of the additional insured status.

Project Owners from General Contractors

Project owners - developers, REITs, hospitals, universities - require GCs to name them as additional insured on the GC's GL policy. For large commercial construction projects, this requirement is standard and the project owner's counsel reviews the endorsement forms before the contract is signed.

Project owners frequently require the blanket-additional-insured endorsement rather than a scheduled additional insured, because blanket coverage automatically extends to future project owners added to the contract scope without requiring individual endorsements each time.

Landlords from Commercial Tenants

Commercial leases almost universally require the landlord to be added as additional insured on the tenant's GL policy. The applicable form is CG 20 11 (Additional Insured - Managers or Lessors of Premises). This endorsement covers the landlord for claims arising from the tenant's use of the leased premises.

The coverage scope is specific: CG 20 11 covers the landlord for claims connected to the tenant's operations at the leased location. It does not extend to the landlord's independent negligence unrelated to the tenant's operations. Courts in California (under Insurance Code 11580.04), Texas (Tex. Ins. Code 151), and other states have enforced this limitation.

Lenders from Borrowers on Commercial Loans

Commercial lenders require additional insured status on the property insurance policy as a condition of loan closing. For property insurance, this takes the form of a mortgagee clause (which is distinct from additional insured on a GL policy). On liability policies, lenders sometimes require additional insured status when the property securing the loan generates significant liability exposure - commercial properties with public access, for example.

Retailers from Vendors

Major retailers - Walmart, Home Depot, Target, Costco - require vendors and contractors performing services on their premises to name the retailer as additional insured. Walmart's vendor compliance program specifies additional insured endorsement requirements as a condition of contractor activation. Non-compliant vendors are not permitted to access retail locations.

Who Should NOT Be Listed as Additional Insured

A party should not be added as additional insured when the underlying contract does not require it. This is not a minor point. Adding unnecessary additional insureds has two concrete negative consequences.

Increased premium. Scheduled additional insured endorsements typically cost $25 to $250 per party. Blanket endorsements cost 2% to 7% of the GL premium. Adding parties who have no contractual basis for the status increases premium without any corresponding business purpose.

Expanded liability exposure. An additional insured has rights under the policy. They can tender claims, demand defense, and receive indemnification. A party added without a contractual requirement can use that status to make claims against the policy. The named insured's aggregate limit can be depleted by claims from a party that had no legitimate entitlement to coverage.

The trigger for additional insured status is explicit contract language - not courtesy, not habit, and not a request from the other party's broker if that party's contract does not require it.

How to Determine if a Contract Requires Additional Insured Status

Reading contracts accurately is a core broker skill. The same contract section that describes insurance requirements will specify whether additional insured status is required or whether a certificate of insurance is sufficient.

Language that requires additional insured status:

• "Name [party] as additional insured on your commercial general liability policy"
• "Add [party] as additional insured"
• "[Party] shall be named as additional insured on a primary and non-contributory basis"
• "Provide additional insured coverage using ISO form CG 20 10 or equivalent"

Language that does NOT require additional insured status:

• "Provide a certificate of insurance to [party]"
• "Furnish evidence of insurance showing the required coverages"
• "Name [party] on the certificate"

The phrase "name on the certificate" is a persistent source of confusion. It describes certificate holder status, not additional insured status. Listing a party in the Certificate Holder box on ACORD 25 satisfies "name on the certificate." It does not create additional insured status. Contracts using ambiguous language should be reviewed with the named insured and, when the stakes are significant, with counsel.

Some contracts reference specific ISO endorsement form numbers. "CG 20 10 07 04 or later" is a reference to the 2004 edition of the ongoing operations endorsement. The edition date matters because earlier editions (the 1993 edition especially) are broader than later ones. If the contract specifies an edition that the carrier no longer issues, the broker needs to flag this before issuing a certificate claiming compliance.

The Role of Blanket Additional Insured Endorsements

For insureds with many additional insured relationships - contractors, staffing agencies, service providers - scheduling each party individually creates an administrative and premium management problem. A contractor with 30 active projects and 50 project owners requires 50 separate scheduled endorsements under that structure.

The blanket-additional-insured endorsement solves this. It grants additional insured status to any party with whom the named insured has a written contract requiring such status, without requiring each party to be scheduled. One endorsement covers all qualifying relationships.

Two conditions govern blanket endorsements. First, a written contract must exist between the named insured and the additional insured party, specifying the additional insured requirement. Verbal agreements and email confirmations without formal contracts typically do not activate blanket coverage. Second, the contract must have been executed before the loss occurs. A contract signed after a claim is filed does not retroactively grant blanket coverage.

The cost of a blanket endorsement - typically 3% to 7% of the GL premium - is almost always less than the combined cost of scheduling 20 or more parties individually, and dramatically reduces the administrative overhead of tracking each endorsement separately.

The Risk of Listing Someone as Additional Insured Without a Corresponding Endorsement

This is the highest-risk error in certificate issuance. If a certificate shows additional insured status in the description of operations or in the certificate holder section, but the policy does not carry the corresponding endorsement, the certificate is misrepresenting coverage.

The ACORD 25 disclaimer says the certificate confers no rights. But when a party reasonably relies on a certificate showing additional insured status, and a claim arises where they attempt to tender to the policy, three outcomes follow. The carrier denies the claim because no endorsement exists. The additional insured sues the named insured for breach of the contract requiring additional insured status. The named insured (and the additional insured) sue the agency for E&O based on the incorrect certificate.

A 2023 review by an E&O carrier of construction account claims found that 23% of E&O claims involved certificates overstating additional insured coverage. A waiver-of-subrogation shown on the certificate without a corresponding endorsement creates the same exposure - the carrier can subrogate against a party the certificate said was protected, and the agency that issued the inaccurate certificate is liable.

The correct process: verify the policy endorsement before issuing the certificate. If the endorsement is not in place, request it from the carrier before issuing - not after.

For policies with self-insured-retention provisions, note that additional insured status interacts with SIR obligations. In some policy structures, the named insured's SIR applies to claims by additional insureds, which can create disputes about who bears the initial defense costs.

For more on managing additional insured requirements across complex accounts, see our guides on endorsement verification workflows and blanket AI endorsement management.

Frequently Asked Questions

Who typically needs to be listed as additional insured on a GL policy?

The parties who most commonly require additional insured status are: general contractors (requiring subcontractors to add them using CG 20 10 and CG 20 37), project owners (requiring GCs to add them), landlords (requiring commercial tenants to add them using CG 20 11), and retailers (requiring vendors to add them). The common thread is a contractual relationship where one party has potential liability exposure arising from the other party's operations.

How do you know if a contract requires additional insured status?

Read the insurance requirements section of the contract. Language explicitly requiring "additional insured" status - "name [party] as additional insured," "add [party] as additional insured," or specific ISO form references - triggers the endorsement requirement. Language that only requires a "certificate of insurance," "evidence of insurance," or "naming on the certificate" does not require additional insured status. When contract language is ambiguous, confirm with the named insured and the contract counterparty before issuing.

What is the difference between a scheduled and blanket additional insured endorsement?

A scheduled additional insured endorsement names specific parties on the policy. Each party requires its own endorsement, which adds premium for each party added. A blanket additional insured endorsement automatically covers all parties with whom the named insured has a written contract requiring additional insured status, without scheduling each party individually. Blanket endorsements cost 3% to 7% of the GL premium but are more economical for insureds with 20 or more additional insured relationships annually.

What happens if I list someone as additional insured without the endorsement?

The certificate misrepresents coverage. If a claim arises and the additional insured attempts to tender to the policy, the carrier denies the claim because no endorsement exists. The additional insured then has contract claims against the named insured (for breach of the insurance requirement) and E&O claims against the agency (for the inaccurate certificate). A 2023 E&O carrier analysis found 23% of construction E&O claims involved certificates overstating additional insured coverage.

Does adding an additional insured increase my client's premium?

Yes. Scheduled additional insured endorsements typically cost $25 to $250 per party. Blanket additional insured endorsements cost 2% to 7% of the general liability premium. Primary and non-contributory endorsements add an additional 3% to 10%. Adding parties without a contractual basis increases premium without business purpose and expands the pool of parties who can make claims against the policy.

Can a blanket additional insured endorsement replace all scheduled endorsements?

For most contractors and service providers, yes. The blanket endorsement covers all parties with a written contract requiring additional insured status, which is the same population that would otherwise need to be scheduled individually. The conditions are: a written contract (not verbal) must exist before the loss, and the contract must specifically require additional insured status. Parties added by habit rather than by written contractual requirement are not covered by blanket endorsements.

Written by Javier Sanz, Founder of BrokerageAudit. Last updated April 2026.

Every certificate needs to match its policy. BrokerageAudit's COI Manager verifies additional insured claims against policy endorsements before certificates are issued, so your agency never overstates coverage. See COI Manager