Understanding Requiring Primary Noncontributory Coverage for Insurance Brokers

Requiring primary noncontributory coverage appears in virtually every commercial construction contract, many commercial leases, and a growing share of government service agreements. For brokers, the topic creates two distinct and opposite challenges: advising clients who are being required to carry P&NC, and advising clients who are requiring P&NC of their contractors and vendors.

Each side carries different action steps, different verification requirements, and different failure modes. This guide covers both.

Key Takeaways

• 71% of commercial construction contracts require primary and non-contributory AI coverage per ACORD 2024, making this one of the most common certificate compliance requirements brokers manage.
• When your client is the contractor being required to carry P&NC, the first action is confirming the written contract language before requesting CG 20 01 from the carrier; the endorsement only activates when a written contract requires it.
• When your client is the GC or owner requiring P&NC, the COI's Description of Operations field is the only place P&NC will appear; there is no checkbox on the ACORD 25 face.
• "Additional insured as required by contract" in the DOO confirms AI status only; it is not acceptable as P&NC confirmation.
• Most admitted GL carriers add CG 20 01 for standard commercial classes at 2 to 5% of GL premium; excess and umbrella carriers frequently decline to follow the underlying P&NC endorsement without specific endorsement.
• Blanket P&NC on a policy eliminates per-project endorsement requests and reduces certificate issuance time, but requires confirmation that the blanket language covers the specific contract relationship.

Side 1: Your Client Is the Contractor Being Required to Carry P&NC

Who Requires It

General contractors require P&NC on subcontractor GL policies in commercial construction. This is standard language in AGC master subcontract agreements and AIA contract forms. Commercial landlords require it on tenant GL policies when the lease creates exposure for the landlord. Government contracting agencies include it in most construction and service agreements. Franchise systems require it to protect the franchisor from losses arising from franchisee operations.

The requirement has expanded beyond large GC contracts. IIABA 2025 data shows P&NC language appearing in smaller commercial service agreements for janitorial, landscaping, and security services - categories where it was uncommon five years ago.

What to Do When the Contract Requires P&NC

Step 1: Read the contract language. The trigger matters. "Coverage shall be primary and non-contributory" is standard and activates CG 20 01. "Coverage shall be primary and non-contributory with respect to [the named party's] general liability policy" is more specific and may require the endorsement to reference that party by name rather than applying broadly.

Step 2: Confirm the written contract exists and is signed. CG 20 01 only activates when a written contract requires primary and non-contributory status. A signed subcontract or lease is sufficient. A verbal agreement or an unsigned draft is not.

Step 3: Request ISO CG 20 01 from the carrier. Provide the carrier with the relevant contract language. Some carriers require prior underwriting approval for certain classes. Confirm the carrier will issue the endorsement before telling the GC the requirement is met.

Step 4: Confirm the cost. For standard commercial classes, expect 2 to 5% of the GL premium. Get written confirmation from the carrier so the client understands the cost before binding.

Step 5: Confirm the endorsement is issued and attached to the policy before the COI is sent. Do not issue the certificate based on a verbal carrier confirmation. The endorsement must be in force.

Step 6: Document the Description of Operations correctly. Use: "Coverage is primary and non-contributory per ISO CG 20 01 where required by written contract." If the carrier uses a proprietary form rather than the ISO form, reference the carrier's specific form number.

Carrier Positions on P&NC

Most admitted carriers add CG 20 01 without issue for standard commercial GL classes. The endorsement is routine for general commercial accounts, office tenants, and most trade contractors.

High-hazard classes face different carrier responses. Roofing, demolition, scaffolding, and certain hazardous materials contractors may find that admitted carriers decline to add CG 20 01 or require prior written approval from a senior underwriter. In those cases, the broker's options are to seek coverage through an E&S carrier that offers P&NC on a manuscript endorsement, or to notify the GC that the requirement cannot be met.

Excess and umbrella carriers present a separate issue. Most umbrella and excess policies do not automatically follow the underlying GL policy's primary and non-contributory endorsement. If the contract requires P&NC at the umbrella level, the umbrella carrier must be specifically endorsed. Many umbrella carriers decline entirely. This is a gap that creates real exposure when a large claim exceeds the GL limit.

Completed operations: some carriers add CG 20 01 for ongoing operations but decline for completed operations. Construction contracts that require P&NC through the completed operations period need the endorsement to apply to both. Confirm the scope of the endorsement with the carrier.

Side 2: Your Client Is the GC or Owner Requiring P&NC of Contractors

What Your Client Needs to Verify

When your client is the party requiring P&NC, the goal is confirming that the contractor's policy actually provides it. That confirmation process has several steps.

Step 1: Review the contract. Confirm that the written contract with the contractor explicitly requires primary and non-contributory status. A contract that requires additional insured status but does not specify primary and non-contributory status does not trigger CG 20 01 on the contractor's policy.

Step 2: Review the COI's Description of Operations field. P&NC will not appear anywhere else on the ACORD 25. There is no checkbox. Look specifically for language referencing primary and non-contributory status and a specific endorsement form number.

Step 3: Evaluate the DOO language critically. Not all DOO entries confirm P&NC. The following language confirms AI status only: "Additional insured as required by contract." It says nothing about primary and non-contributory. Your client's coverage is at risk if it accepts this language as P&NC confirmation.

Acceptable P&NC notation includes: "Coverage is primary and non-contributory per ISO CG 20 01 where required by written contract" or "Coverage is primary and non-contributory per [carrier form number] where required by written contract" or an equivalent statement that clearly identifies both the primary and non-contributory obligation and the endorsement providing it.

Step 4: For material accounts, request a copy of the endorsement. A certificate is informational only. ACORD explicitly states on the ACORD 25 that the certificate does not confer rights or amend policy coverage. For high-value projects or high-risk contractors, request the actual endorsement from the carrier to confirm it matches what the certificate describes.

Common Mistakes When Requiring P&NC

Accepting "additional insured as required by contract" as P&NC confirmation is the most frequent error. This language appears on a large percentage of certificates. Agents reviewing incoming certificates for GC clients must be trained to distinguish between AI confirmation and P&NC confirmation.

Accepting verbal confirmation instead of endorsement verification. A contractor's agent calling to say "yes, P&NC is on the policy" is not documentation. The COI must reflect it and, for material accounts, the endorsement copy confirms it.

Not following up at renewal. The contractor's policy may renew with a different carrier or on different terms. P&NC on the policy in Year 1 does not guarantee it on renewal. Your client's COI review process must re-verify P&NC at each policy renewal.

Not addressing the umbrella level. If the contract requires P&NC at the umbrella level, the umbrella COI must separately confirm it. The underlying GL's P&NC endorsement does not automatically extend to the umbrella.

Comparison Table: Requiring P&NC vs. Being Required to Carry P&NC

Blanket P&NC vs. Per-Project P&NC

Contractors who work with multiple GCs on multiple projects face a choice between per-project P&NC endorsements and blanket P&NC.

Per-Project P&NC

Per-project P&NC adds CG 20 01 for specific named additional insureds and specific contracts. The endorsement identifies the GC or project owner by name. Each new contract or project that requires P&NC triggers a new endorsement request to the carrier.

Cost: typically 2 to 5% of GL premium per endorsement. A sub working on 8 to 12 projects per year with different GCs pays multiple endorsement charges and manages multiple carrier approval processes.

Advantage: precise. The endorsement clearly identifies which relationships are covered by P&NC.

Disadvantage: administratively intensive. Each new GC relationship requires a new carrier request, approval, and endorsement. Certificate issuance is delayed until the carrier confirms the endorsement.

Blanket P&NC

Blanket P&NC adds primary and non-contributory status for all additional insured relationships where a written contract requires it. One endorsement covers all contracts across the policy period.

Cost: some carriers include blanket P&NC in blanket AI endorsement packages at no additional charge. Others charge a flat annual fee, typically lower than the cumulative cost of multiple per-project endorsements. IIABA 2025 estimates that contractors with 6 or more GC relationships per year reduce endorsement costs by 30 to 50% by switching from per-project to blanket P&NC.

Advantage: operationally efficient. No per-project carrier requests. The endorsement is confirmed once and applies throughout the policy period.

Disadvantage: requires careful review of the blanket endorsement language. Not all blanket endorsements are identical. Some have class exclusions, project type limitations, or require the written contract to specifically invoke P&NC. Confirm the blanket language actually covers the specific GC relationship before issuing the certificate.

Contract Language to Watch For

Not all P&NC contract language is identical. Two common variations have meaningfully different implications:

Version 1: "The contractor's coverage shall be primary and non-contributory."

This is the standard form. CG 20 01 satisfies it directly. The endorsement applies to all additional insured relationships under the policy where a written contract exists.

Version 2: "The contractor's coverage shall be primary and non-contributory with respect to [Owner's Name]'s general liability policy."

This version is more specific. It ties the P&NC obligation to a named party's own GL policy. Some carriers interpret this to require a scheduled endorsement identifying that party by name rather than a blanket endorsement. Confirm with the carrier that the blanket form satisfies this more specific language, or request a scheduled endorsement.

Version 3 (insufficient): "The contractor shall maintain additional insured coverage."

This language requires AI status only. It does not require P&NC. If your client is the GC, it should request a contract amendment to include P&NC language. If your client is the contractor, this contract does not require CG 20 01.

Frequently Asked Questions

What contract language triggers a primary noncontributory coverage requirement?

The trigger language typically reads: "Coverage shall be primary and non-contributory" or "Insurance maintained by [contractor] shall be primary and non-contributory with respect to any insurance maintained by [owner/GC]." Both versions activate CG 20 01 on the contractor's policy when the other conditions are met. Language that requires "additional insured" status only, without referencing primary or non-contributory, does not trigger CG 20 01 and does not give the GC P&NC protection.

How does an agent confirm that a contractor's policy has primary noncontributory coverage?

Start with the ACORD 25 Description of Operations field. It must contain explicit P&NC language referencing a specific endorsement, such as ISO CG 20 01 or the carrier's proprietary form number. "Additional insured as required by contract" is not sufficient. For material accounts or high-risk contractors, request a copy of the actual endorsement from the carrier. Certificates are informational only and do not confer rights per ACORD's own language on the form.

Does an umbrella policy automatically follow the underlying GL's primary noncontributory endorsement?

No. The umbrella policy responds based on its own terms. Most umbrella and excess carriers do not automatically adopt the underlying GL's primary and non-contributory endorsement. If the construction contract requires P&NC at the umbrella level, the umbrella carrier must be specifically endorsed to provide it. Many umbrella carriers decline to add P&NC endorsements, or add them only with restrictions. If the GC requires P&NC at both the GL and umbrella levels, verify both policies separately.

What should P&NC notation on a COI's Description of Operations field say?

The notation should identify both the P&NC obligation and the endorsement providing it: "Coverage is primary and non-contributory per ISO CG 20 01 where required by written contract." If the carrier uses a proprietary form, substitute the carrier's form number. The notation should not be vague. "Primary and non-contributory as required" without a form reference is less specific and may lead a certificate holder's attorney to question whether the endorsement actually exists. Specificity protects both the issuing agent and the certificate holder.

Can a carrier refuse to add a primary noncontributory endorsement?

Yes. Carriers can decline to add CG 20 01 for high-hazard classes, certain project types, or specific risk profiles. Common declinations occur for roofing, demolition, and excavation contractors. Some carriers add P&NC only with prior written underwriting approval, which can delay certificate issuance by days or weeks. When a carrier declines, the broker must notify the GC in writing. The GC then decides whether to proceed with the sub or require the sub to obtain coverage through a different carrier. An E&S carrier with a manuscript P&NC endorsement may be the only available option.

What is the cost difference between requiring P&NC for each project vs. having blanket P&NC on the policy?

Per-project P&NC via a scheduled CG 20 01 typically costs 2 to 5% of the GL premium per endorsement. A contractor with 8 GC relationships per year at a $12,000 GL premium might pay $240 to $600 per endorsement, totaling $1,920 to $4,800 annually for per-project endorsements. Blanket P&NC on a blanket AI policy may be included at no additional charge or for a flat fee of $400 to $800 for the year, covering all applicable relationships. IIABA 2025 estimates that high-volume contractors reduce annual endorsement costs by 30 to 50% by moving from per-project to blanket P&NC. The trade-off is that blanket endorsements require more careful review to confirm the language covers each specific contract relationship.

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