Negotiating Blanket Additional Insured Explained: Key Insights for Brokers

Negotiating blanket additional insured requirements is a high-value skill that separates technically strong brokers from order-takers. Most agents process AI requests reactively: a client sends a contract demanding AI coverage, the agent issues a certificate, and everyone assumes coverage exists. That assumption breaks down when the contract demands coverage the market will not provide.

This post explains how to negotiate AI requirements from both sides of the relationship, what is achievable with standard ISO forms, what is not, and how to advise clients when the contract and the policy are not aligned.

Key Takeaways

• IIABA 2025 data: approximately 30% of AI-related contract disputes involve coverage demands the standard ISO endorsement cannot satisfy.
• Primary and non-contributory language requires a separate endorsement (ISO CG 20 01) and typically adds 2-5% to GL premium; it does not come standard with a blanket AI endorsement.
• Standard carriers will not cover the AI's sole negligence, provide separate AI limits, or convert an occurrence policy to claims-made for AI purposes; these are non-negotiable limits.
• Adding blanket AI for ongoing and completed operations (CG 20 33 + CG 20 37) typically costs 5-15% of GL premium; agents should quantify this cost and include it in client contract pricing.
• When a contract demands coverage the market will not provide, agents must advise the client in writing and document the acknowledgment; this documentation is the agency's primary E&O defense.
• Providing clients with a written ISO AI scope summary for use in contract negotiations is a differentiating advisory service that most agents do not offer.

Who Does the Negotiating?

When brokers talk about negotiating blanket AI, the negotiation happens on two fronts simultaneously.

Front 1: Negotiating with the carrier to place the right AI endorsements at the right terms. This means knowing which forms are available, what they cost, and which carrier modifications restrict scope.

Front 2: Negotiating with the contract on behalf of the client to align the contract's AI requirements with what the market actually provides. This means advising clients when contract demands exceed market availability and equipping them to push back on unachievable requirements.

Most agents only work Front 1. Brokers who add Front 2 create a service that clients cannot easily replicate or replace.

When Clients Receive AI Demands

Three commercial situations generate most AI demands.

Commercial tenants and landlords. A commercial landlord requires the tenant to add the landlord as an AI on the tenant's GL policy. Standard AI endorsements can accommodate this. The scope is typically limited to liability arising from the tenant's use of the premises. Landlords who demand coverage for their own negligence create a scope gap.

Contractors and GCs. A GC requires a sub to name the GC as an AI on the sub's GL policy. This is the most common scenario in construction. The ISO CG 20 33 (ongoing operations) and CG 20 37 (completed operations) are designed for exactly this purpose. The issue arises when the subcontract demands broader coverage than the ISO forms provide.

Service vendors and clients. A corporate client requires a service vendor (IT firm, janitorial company, staffing agency) to carry blanket AI naming the client. Standard blanket AI endorsements work here. The scope question is the same: does the contract demand coverage for the client's own independent negligence? If so, the standard market cannot deliver.

Contract AI Language That Exceeds Standard ISO Scope

IIABA 2025 data shows approximately 30% of AI contract disputes involve demands the ISO endorsement cannot satisfy. The four most common demands that exceed standard coverage are:

1. AI coverage for the AI's own sole negligence. Contract language reads: "Coverage shall apply to the additional insured's sole negligence." No standard ISO AI form provides this. The "arising out of your operations" limitation in every ISO AI endorsement expressly restricts coverage to the named insured's activities.

2. Separate per-occurrence limits for the AI. Contract language reads: "Additional insured shall have its own limit of no less than $2M per occurrence." ISO AI forms share the named insured's limits. There is no separate limit for AI parties. This demand cannot be met with standard forms.

3. Blanket AI without a written contract requirement. Some contracts demand AI coverage for any party who requests it, without requiring a written agreement. Standard ISO blanket AI forms require a written contract. Carriers do not offer blanket AI without the written contract trigger.

4. Primary and non-contributory without a separate endorsement. Contract language demands that the AI coverage be "primary and non-contributory" to any other insurance the AI carries. This is achievable with a separate ISO CG 20 01 endorsement, but it is not automatic with blanket AI. Agents who issue certificates checking "primary and non-contributory" without confirming the CG 20 01 is on the policy are misrepresenting coverage.

What Is Negotiable With Standard Carriers

These AI-related items are available through standard markets with the right placement and endorsements.

Agents who know this table have a concrete answer for every contract AI demand. The question is never "can we provide AI coverage?" The question is "which forms are needed, and what will they cost?"

What Is Not Negotiable With Standard Carriers

These demands appear in contracts regularly. No standard carrier will accommodate them.

Coverage for the AI's own sole negligence. The ISO AI forms limit coverage to the named insured's operations. Coverage for the AI's independent acts is outside the policy structure. Excess lines carriers may offer manuscript endorsements in rare cases, but this is not available as a standard market option.

Limits higher than the named insured's limits. The AI cannot receive more coverage than the named insured carries. An AI party demanding $5M per occurrence when the named insured has a $1M limit cannot be satisfied. The only solution is increasing the named insured's limits.

Conversion from occurrence to claims-made for AI purposes. Occurrence policies cannot be selectively converted to claims-made for AI coverage. The policy form governs. Some contracts written by corporate legal departments include this demand without understanding its impossibility.

Blanket AI without the written contract trigger. The written contract requirement is inherent to all ISO blanket AI forms. Carriers do not offer blanket AI that covers anyone who requests it, regardless of whether a written agreement exists.

Negotiating Contract Language With the Certificate Holder

When a contract demands coverage the market will not provide, agents have two paths.

Path 1: Advise the client to push back on the contract language. This requires equipping the client with a clear explanation of what standard ISO AI forms do and do not cover. Many certificate holders accept standard ISO language once they understand the scope. Their legal departments inserted broad language as a starting position, not a firm requirement.

Provide the client with a written summary of the ISO AI endorsement scope: what it covers (liability arising from the named insured's operations), what it excludes (the AI's own negligence, separate limits, completed operations without CG 20 37), and what requires a separate endorsement (primary and non-contributory via CG 20 01). This summary becomes the client's negotiating document.

Path 2: Document the gap and advise in writing. If the client cannot or chooses not to push back on the contract, the agent must document the gap in writing. The documentation should state: "Your policy's AI endorsement does not cover [specific demand in the contract]. This means that if a claim arises that falls within the gap, the AI endorsement will not respond to that claim."

The client signs the acknowledgment. The agent retains it in the file. This documentation is the agency's primary defense in an E&O claim.

The Cost of AI Coverage as a Negotiating Point

AI coverage has a real cost. Agents should quantify it and verify clients factor it into contract pricing.

A contractor adding blanket AI (CG 20 33 + CG 20 37) to a $20,000 annual GL premium at a rate of 10% pays $2,000 per year for the AI endorsement package. If the contractor's standard subcontract also demands primary and non-contributory (CG 20 01 at 3% of GL premium), add another $600 per year. Total AI-related endorsement cost: $2,600 per year.

If the contractor works exclusively on projects where the GC demands these coverages, the $2,600 is a cost of doing business. If the contractor takes on three projects per year, that $2,600 should be allocated in project pricing. Agents who help clients understand this connection add value that extends beyond the certificate.

When a contract demands AI coverage that adds 10-15% to the client's GL premium, that number needs to be in the client's contract negotiations. A client who signs a contract without knowing the insurance cost of compliance cannot recover that cost from the project.

Building the AI Scope Advisory as an Agency Service

The AI scope advisory is a differentiated service. Most agents do not offer it. The few who do create client retention and referral advantages.

The service has four components.

Component 1: Contract review at renewal. Ask for a copy of the client's standard contract templates during the renewal process. Review the AI language. Flag demands that exceed standard ISO forms. Advise in writing before renewal is bound.

Component 2: Written ISO scope summary. Create a one-page plain-language summary of ISO AI endorsement scope. Include what CG 20 33 covers, what CG 20 37 adds, what CG 20 01 provides, and what no standard form will provide. Give this to clients to use in contract negotiations with their counterparties.

Component 3: Pre-certificate verification. Before issuing any certificate reflecting AI status, verify the written contract exists, identify which AI endorsement covers the relationship, and confirm the scope matches the contract requirement. Document the verification in the certificate file.

Component 4: Gap disclosure letters. When a gap exists between contract requirements and policy scope, produce a written gap disclosure letter for the client's signature. This protects the agency and prompts the client to take action.

Primary and Non-Contributory: The Most Commonly Misrepresented AI Item

Primary and non-contributory is not included in a blanket AI endorsement. It requires a separate ISO CG 20 01 endorsement. Agents who check the "primary and non-contributory" box on an ACORD 25 without confirming the CG 20 01 is on the policy are misrepresenting coverage.

The CG 20 01 endorsement states that the named insured's GL coverage is primary to any other insurance the AI carries and that the named insured's insurer will not seek contribution from the AI's insurer. This is a meaningful coverage advantage for the AI. It costs 2-5% of GL premium with most standard carriers.

When a contract demands primary and non-contributory, the placement checklist is: (1) confirm blanket AI endorsement is in place, (2) add CG 20 01 to the policy, (3) confirm the ACORD 25 certificate accurately reflects both the AI status and the primary and non-contributory endorsement. Do not check the box without the endorsement.

Frequently Asked Questions

What AI coverage demands are non-negotiable with most carriers?

Three demands are non-negotiable with standard carriers: coverage for the AI's own sole negligence, separate per-occurrence limits for the AI beyond the named insured's limits, and blanket AI without the written contract trigger. These limitations are inherent to the ISO policy structure and cannot be endorsed away with standard forms. Some E&S carriers may offer manuscript solutions for large accounts, but standard market carriers do not.

How does an agent negotiate AI scope when the contract requires broader coverage than ISO provides?

First, identify the specific demand that exceeds ISO scope. Second, advise the client in writing that the policy cannot satisfy that demand. Third, provide the client with a plain-language ISO AI scope summary to use in negotiations with the certificate holder. Fourth, document the gap in the client file. Many certificate holders accept standard ISO language once the scope is explained. For clients who cannot negotiate the contract language, the written gap disclosure letter is the agency's protection.

What is primary and non-contributory and how does it interact with blanket additional insured?

Primary and non-contributory is a coverage feature, separate from the AI endorsement, that makes the named insured's GL policy primary to any other insurance the AI carries and prevents the named insured's insurer from seeking contribution from the AI's insurer. It requires ISO CG 20 01 as a standalone endorsement. It is not included automatically in a blanket AI endorsement. Checking "primary and non-contributory" on a certificate without the CG 20 01 on the policy is a misrepresentation. The cost is typically 2-5% of GL premium.

Can a contract require an AI to have separate policy limits?

A contract can demand it, but no standard ISO AI form provides it. AI parties share the named insured's per-occurrence and aggregate limits. The only way to increase the limits available to an AI is to increase the named insured's policy limits. Agents should advise clients whose contracts include separate-limits language that this demand cannot be satisfied with standard forms and document that advice in writing.

How should an agent advise a client whose contract demands AI coverage the policy won't provide?

Give the client three things: a written explanation of what the policy's AI endorsement actually covers, a plain-language ISO AI scope summary to use in contract negotiations, and a gap disclosure letter documenting the specific coverage demand the policy cannot satisfy. Ask the client to sign and return the gap disclosure letter for the file. Then help the client understand their negotiating position: most certificate holders accept standard ISO language when it is explained clearly. If the client cannot negotiate the contract, they need to understand the risk exposure the gap creates.

What is the cost impact of adding primary and non-contributory to a blanket AI endorsement?

Primary and non-contributory via ISO CG 20 01 typically costs 2-5% of GL premium in addition to the blanket AI endorsement cost. For a $20,000 GL premium account, that is $400-$1,000 per year. The blanket AI endorsement itself costs 5-15% of GL premium (CG 20 33 + CG 20 37 combined). Total AI-related endorsement cost including primary and non-contributory for a $20,000 premium account: approximately $1,400-$4,000 per year. Agents should present this cost clearly to clients and advise them to include it in contract pricing.

BrokerageAudit's COI Manager tracks AI endorsement requirements for every account and flags when contract demands exceed the policy's scope. See how it works →

Related terms: Certificate Holder, Primary And Noncontributory, Named Insured

Related posts: #161, #162

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