When To Require Additional Insured Status: A Practical Guide for Agencies

Knowing when to require additional insured status separates agencies that manage commercial accounts cleanly from those that generate E&O claims after a loss. The decision is not complicated in theory, but in practice, it gets missed regularly. ACORD 2024 data shows that ISO CG 20 10 and CG 20 37 together appear on approximately 80% of commercial construction projects. The question for every broker is whether their clients' policies match what the contract actually demands.

This guide gives you a clear framework: when AI status is contractually required, when it is appropriate even without a contract mandate, and when it is the wrong choice. You will also get the ISO endorsement breakdown every commercial broker needs to know.

Key Takeaways

• ACORD 2024 data shows ISO CG 20 10 and CG 20 37 together are required on approximately 80% of commercial construction projects - making them the default starting point for most contractor accounts.
• Additional insured status is a policy-level designation, not a certificate-level one; a COI cannot create AI status without a confirmed endorsement on the underlying policy.
• ISO CG 20 10 covers ongoing operations; ISO CG 20 37 covers completed operations - most construction contracts require both, and issuing without one is a coverage gap.
• Blanket additional insured endorsements, which cover any party required by written contract, are preferred for contractors with multiple project owners and reduce per-project endorsement processing by up to 60%.
• Adding AI status (ongoing plus completed operations) typically costs 5% to 15% of the GL premium; some carriers include blanket AI in base forms for preferred contractors.
• Failing to add AI when a contract requires it is a direct E&O exposure for the issuing broker; IIABA 2025 E&O data identifies missing AI endorsements as a top-5 cause of agency errors and omissions claims.

What Additional Insured Status Actually Means

An additional insured is a party added to someone else's insurance policy who receives coverage rights for specified operations or locations. The additional insured can make claims under the named insured's policy for losses arising from the named insured's work or presence.

This is categorically different from a certificate holder, who receives only a notification that coverage exists. The additional insured has actual standing under the policy. The certificate holder does not.

When a general contractor requires a subcontractor to name the GC as additional insured, the GC is protecting itself from claims arising from the sub's work. If a worker on the sub's crew causes an injury and the GC gets sued, the GC can tender that claim to the sub's insurer as an additional insured.

That is the mechanism. The question brokers need to answer is: when does a situation call for it?

When AI Status Is Contractually Required

The most common trigger for additional insured requirements is a written contract. When a contract says "name XYZ as additional insured," the requirement is not optional and the broker's job is to confirm the policy reflects it.

Construction Contracts

Construction is the highest-frequency environment for AI requirements. The typical structure:

• Project owner requires the general contractor to name the owner as additional insured on the GC's GL policy.
• The GC requires each subcontractor to name the GC (and sometimes the owner) as additional insured on the sub's GL policy.
• Sub-subcontractors may face the same requirement from their direct GC.

This creates a chain of AI obligations across every project. ACORD 2024 data confirms that CG 20 10 plus CG 20 37 appears in approximately 80% of commercial construction contracts. Reviewing the subcontract before binding is not optional.

Commercial Leases

Landlords routinely require commercial tenants to name the landlord as additional insured on the tenant's general liability policy. The landlord wants protection if a customer is injured on the leased premises and sues the property owner. This is a standard requirement in virtually all commercial lease agreements above a basic month-to-month arrangement.

Service Agreements

Professional service contracts, IT service agreements, janitorial contracts, and facilities management agreements frequently require the service provider to name the client as additional insured. The trigger is the potential for the vendor's operations to create liability for the client. Higher-risk services (security, maintenance, delivery) are more likely to include this requirement than lower-risk ones (consulting, software-only services).

Government Contracts

Municipal, state, and federal government contracts almost always require vendors to name the applicable government entity as additional insured. Some government clients also require AI on the auto policy. Brokers handling government contractor accounts should treat AI as a default requirement, not an exception.

Franchise Agreements

Franchisors typically require franchisees to name the franchisor as additional insured on the franchisee's GL and sometimes auto policies. This protects the franchisor's brand against liability arising from individual franchise operations. The franchise disclosure document or franchise agreement will specify the exact requirements.

When AI Status Is Appropriate Without a Contract Mandate

Not every situation requiring AI comes with a written contract that spells it out. Experienced brokers identify these scenarios proactively.

High-Risk Service Relationships

When a client's operations create meaningful liability exposure for another party - even without a formal contract requirement - AI status is worth recommending. A landscaping company working regularly on a client's property, a staffing agency placing workers at a client site, or a caterer working at a client's venue all involve operations that could trigger a lawsuit against the host party.

Recommending AI in these situations, and documenting that the client declined if they choose not to add it, is good E&O practice.

Projects Above Defined Dollar Thresholds

Many agencies set internal thresholds for when to flag AI review. A common benchmark: any project or service contract above $500,000 in value triggers a mandatory AI review. This is not a regulatory requirement - it is a risk management practice that prevents large exposures from slipping through without proper review.

Situations Where the Client's Work Could Create Third-Party Liability

If your client's operations could realistically generate a liability claim against another party, that party has a reasonable interest in AI coverage. The test is simple: could a claim from the client's operations land on someone else's doorstep? If yes, AI is worth discussing.

When AI Status Is NOT Appropriate

Requiring additional insured when it is not warranted creates unnecessary cost for clients and can generate coverage complications.

Low-Liability Vendor Relationships

A software-only vendor with no physical presence at the client site, a data analytics contractor working remotely, or a publisher providing content to a business rarely creates meaningful liability for the client's premises or operations. Adding AI in these cases increases premium for marginal risk reduction.

Situations Where the Certificate Holder Has Its Own Adequate Coverage

If the party requesting AI status already carries its own reliable GL policy and the named insured's work poses a genuinely low liability risk, the AI designation is largely redundant. It adds cost without proportionate risk transfer.

Situations Where AI Would Create Coverage Complications

In some cases, adding multiple parties as additional insureds creates questions about which policy responds first and how coverage coordinates. This is especially relevant when both parties carry similar limits. A blanket additional insured endorsement on the named insured's policy often handles this more cleanly than a custom endorsement per project.

The ISO Endorsement Framework: Which One Applies?

Understanding which endorsement to use is one of the most practical skills in commercial lines COI management.

ISO CG 20 10: Additional Insured for Ongoing Operations

CG 20 10 extends coverage to the additional insured for liability arising from the named insured's ongoing operations. "Ongoing operations" means the work being done while the project or service is active.

Use CG 20 10 when: the contract requires AI during the project, the service relationship is active, or the named insured is currently performing work for the additional insured.

ISO CG 20 37: Additional Insured for Completed Operations

CG 20 37 extends coverage to the additional insured for liability arising from the named insured's completed work. This covers claims that arise after the project is finished - a building defect discovered years later, a product failure, or an injury from an installed system.

Use CG 20 37 when: the contract requires completed operations coverage, the client operates in construction or manufacturing, or the named insured's work could generate liability claims long after the project ends.

Why You Need Both in Construction

Most commercial construction contracts require both CG 20 10 and CG 20 37. A contractor who only has CG 20 10 leaves the additional insured unprotected for post-completion claims. This is one of the most common coverage gaps in contractor accounts. ACORD 2024 data confirms that the combined endorsement pair appears in approximately 80% of construction contracts.

ISO CG 20 26: Additional Insured for a Designated Person or Organization

CG 20 26 provides AI coverage for a specifically named person or organization rather than defining the scope by operation type. It is less common than CG 20 10 or CG 20 37 and is typically used in specialized service contracts where the parties want a named designation rather than a scope-based one.

Blanket vs. Scheduled Additional Insured Endorsements

This choice affects how the endorsement is administered and how much flexibility the named insured has across multiple projects.

Scheduled Additional Insured

A scheduled additional insured endorsement names the specific party receiving AI coverage. It is project-specific and requires a separate endorsement each time a new additional insured is added. Scheduled AI is appropriate when the named insured has a small number of projects or clients requiring AI, or when the carrier requires individual endorsements for underwriting review.

Blanket Additional Insured

A blanket additional insured endorsement extends AI coverage to any party required by written contract, without naming them individually in the endorsement. The coverage is triggered by the contract, not the endorsement language.

Blanket AI is preferred for contractors, subcontractors, and service providers with multiple clients or projects. It eliminates the need to process individual endorsements for each new project. Agencies managing contractor accounts with five or more certificate holders should evaluate blanket AI as the standard approach.

One important limitation: blanket AI endorsements are triggered by written contract requirements. If the requirement is only verbal or implied, the blanket endorsement may not respond.

The Cost of Additional Insured Status

Understanding the cost impact helps brokers have honest conversations with clients about whether the protection is worth the premium.

Typical Cost Range

Adding AI for ongoing operations (CG 20 10) typically costs 3% to 8% of the base GL premium. Adding completed operations (CG 20 37) adds another 2% to 7%. Combined, most contractors see a 5% to 15% increase in GL premium for a standard AI package with both endorsements.

Some carriers include blanket AI in their base commercial GL policy forms for preferred contractor classes. In these cases, there is no additional premium - the coverage is built in. Brokers should identify which of their carriers offer this before recommending add-on endorsements.

Cost by Contract Type

Source: ISO endorsement framework; carrier premium data compiled by BrokerageAudit, 2025.

Common Mistakes Agencies Make with AI Requirements

IIABA 2025 E&O data identifies missing or incorrect AI endorsements as a top-5 cause of agency claims. Here are the specific patterns that generate claims.

Requiring AI When the Contract Does Not Call for It

Adding an AI endorsement that is not required by the contract increases the client's premium without a corresponding contractual obligation. This is not a compliance failure, but it is poor practice. The client may push back when they review the premium increase, and if they ask why it was added, the broker should have a documented reason.

Failing to Require AI When the Contract Demands It

This is the critical E&O exposure. If the contract requires AI and the policy does not have the endorsement, the named insured is in breach of contract and the additional insured has no coverage under the named insured's policy. When a claim arises, the additional insured's insurer will look for contribution from the named insured's carrier - and find nothing.

The named insured gets sued for breach of contract. The broker gets an E&O claim for failing to secure the required endorsement.

Using the Wrong Endorsement

Issuing CG 20 10 without CG 20 37 on a construction project leaves completed operations uncovered. Issuing CG 20 26 when the contract requires ongoing and completed operations coverage fails to meet the contractual standard. Brokers need to read the contract AI requirement carefully before selecting an endorsement.

Listing AI on the Certificate Without Confirming the Endorsement

The COI cannot create AI status. Checking the "Additional Insured" box on ACORD 25 without a confirmed policy endorsement is a misrepresentation. This is one of the most direct paths to an E&O claim for COI-related issues. Always confirm the endorsement is in the policy before reflecting it on the certificate.

A Decision Framework for AI Requirements

Use this process for every commercial account where AI may be relevant:

Step 1: Pull the contract or service agreement and read the insurance requirements section. Do not rely on what the client tells you. Read the actual contract language.

Step 2: Identify every party that the contract requires to be named as additional insured. Some contracts name multiple parties - the project owner, the lender, the property manager, and the municipality may all be listed.

Step 3: Determine which ISO endorsement(s) the contract requires. Ongoing only? Completed only? Both? Named endorsements or blanket?

Step 4: Confirm with the carrier that the endorsement has been added to the policy. Get the endorsement number and the effective date in writing.

Step 5: Issue the certificate only after the endorsement is confirmed. The certificate reflects reality. Do not get ahead of it.

Step 6: Document everything. Store the contract, the endorsement confirmation, and the certificate in the account file. This is your defense if a claim or dispute arises later.

Frequently Asked Questions

When should a contract require additional insured status?

A contract should require additional insured status whenever one party's work, operations, or presence could create liability for another party. This is standard in construction contracts (at every tier), commercial leases (landlord on tenant's GL), service agreements with physical site presence, government vendor contracts, and franchise agreements. ACORD 2024 data confirms AI appears in approximately 80% of commercial construction contracts. For other sectors, the trigger is whether the client's operations could realistically generate a lawsuit against the contracting party.

What is the difference between CG 20 10 and CG 20 37 additional insured endorsements?

ISO CG 20 10 provides additional insured coverage for ongoing operations - work that is currently being performed by the named insured. ISO CG 20 37 provides additional insured coverage for completed operations - liability arising from work the named insured has already finished. Construction contracts typically require both, because claims can arise during a project (CG 20 10) and years after completion (CG 20 37). Using only one endorsement on a construction account leaves the additional insured with a coverage gap.

What is blanket additional insured and when should it be used?

Blanket additional insured is an endorsement that extends AI coverage to any party required by written contract, without naming each party individually. It is the preferred approach for contractors, subcontractors, and service providers who have multiple project owners or clients requiring AI status across different jobs. Blanket AI reduces the administrative burden of adding individual endorsements for each new contract. It is triggered by written contract language, so it does not apply to verbal or implied AI requirements.

How much does adding additional insured status cost?

The cost depends on the endorsements required and the carrier. For ongoing operations only (CG 20 10), expect a 3% to 8% increase in GL premium. For both ongoing and completed operations (CG 20 10 plus CG 20 37), the combined impact is typically 5% to 15% of GL premium. Some carriers include blanket AI at no additional cost in their base forms for preferred contractor classes. Brokers should check their carrier's base form language before quoting AI as an add-on.

Can a certificate holder demand additional insured status through the COI alone?

No. Additional insured status requires a policy endorsement. A certificate holder cannot create AI status by writing it on a request form, including it in a contract requirement section of a COI request, or by demanding the broker check the AI box on ACORD 25 without a confirmed endorsement. If the policy does not have the AI endorsement, the broker must not represent AI status on the certificate. The ACORD 25 disclaimer language makes clear that the certificate confers no rights beyond what the policy actually provides.

What happens if a contract requires additional insured status but the endorsement is missing?

Several things happen, and none of them are good. First, the named insured is in breach of contract for failing to provide the AI coverage required. Second, the additional insured has no coverage under the named insured's policy when a claim arises. Third, if the broker issued a certificate showing AI status without confirming the endorsement, the broker faces an E&O claim for misrepresenting coverage. IIABA 2025 E&O data identifies this as one of the top-5 causes of agency errors and omissions claims. The fix is verification before issuance, every time.

Related Terms

Named Insured | Loss Payee | Certificate Holder

Related posts: #141, #145

BrokerageAudit's COI Manager tracks every additional insured endorsement and flags certificates where AI status is claimed but not confirmed on the policy. See how it works →

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