The primary non contributory endorsement ranks as the second most requested endorsement in construction contracts, right behind additional insured. Yet many GCs have questions about what it does, how it works, and whether they are verifying it correctly.

This guide answers the questions GCs ask most about the primary non contributory endorsement and provides a practical checklist for verifying compliance across your subcontractor base.

What Does "Primary Non Contributory" Actually Mean?

"Primary" means the sub's insurance policy responds first to a claim before the GC's policy gets involved. "Non contributory" means the GC's policy does not contribute to the claim at all, even after the sub's policy has responded.

Without this endorsement, when a sub's work causes a $400,000 bodily injury claim, both the sub's insurer and the GC's insurer negotiate contribution. The GC's insurer might pay 30-50% of the claim depending on the "other insurance" clauses in each policy.

With the primary non contributory endorsement, the sub's policy pays the full $400,000. The GC's insurer pays nothing. The GC's loss history stays clean. Premium renewals stay stable.

How Does the Primary Non Contributory Endorsement Change Claim Payment Order?

Insurance policies contain "other insurance" clauses that determine how multiple policies share a loss. Most CGL policies use one of three approaches:

Other Insurance Clause	How It Works	Effect on GC
Pro rata	Each insurer pays proportional to its policy limits	GC's insurer shares the claim
Excess	One policy pays first, the other pays amounts above the first policy's limits	Depends on which policy is excess
Primary	One policy pays first up to its full limits	Sub's policy pays first

The primary non contributory endorsement overrides the default "other insurance" clause in the sub's policy. It forces the sub's policy into the "primary" position and prevents any contribution from the GC's policy, regardless of what the GC's policy says about other insurance.

This matters because many GC policies contain "primary for own work" clauses that try to position themselves as primary. Without the P&NC endorsement on the sub's policy, two policies both claiming to be primary creates a coverage fight that delays claim resolution by months.

Does the Primary Non Contributory Endorsement Cost Extra?

Yes. The endorsement adds premium to the sub's CGL policy because it increases the sub's insurer's exposure. Instead of sharing claims with the GC's insurer, the sub's insurer absorbs the full cost.

Typical premium increases by trade:

Low-hazard trades (painting, drywall, finish carpentry): 3-5% increase
Medium-hazard trades (plumbing, electrical, HVAC): 5-10% increase
High-hazard trades (roofing, structural steel, demolition): 10-15% increase

On a $25,000 base CGL premium for a medium-hazard trade, the P&NC endorsement adds $1,250 to $2,500 annually. Most subs build this cost into their project bids.

Can Any Carrier Provide a Primary Non Contributory Endorsement?

Most admitted CGL carriers offer either the ISO standard CG 20 01 form or a proprietary equivalent. However, not all carriers are willing to issue it for every insured.

Carriers may decline the endorsement when:

The sub has a poor claims history (3 or more claims in 5 years)
The sub operates in a high-hazard trade with elevated risk profiles
The sub's policy already has a high loss ratio (claims paid vs. premium collected)
The project involves unusual exposures (work over water, confined spaces, elevated heights above 4 stories)

Surplus lines and non-admitted carriers may offer the endorsement more readily but often at higher premium increases. E&S carriers writing contractor CGL policies typically charge 12-20% more for primary and noncontributory status compared to 5-10% from admitted carriers.

If a sub's carrier refuses the endorsement, the GC has three options: accept the risk, require the sub to change carriers, or find a different sub.

What Is the Difference Between "Primary" and "Primary and Noncontributory"?

"Primary" alone sets the payment order but does not eliminate contribution.

Here is the difference in a $500,000 claim scenario:

Primary only: The sub's policy pays first. After paying its share, the sub's insurer may seek contribution from the GC's insurer for the GC's proportionate share of the claim based on comparative negligence or other insurance allocation methods. The GC's insurer could end up paying $100,000 to $200,000.

Primary and noncontributory: The sub's policy pays the full $500,000. The GC's insurer pays $0. No contribution, no sharing, no negotiation between carriers.

The word "noncontributory" is the wall that stops the GC's insurer from being pulled into the claim. Without it, "primary" just means the sub's insurer starts writing the check, not that the sub's insurer finishes writing the check.

How to Verify Primary Non Contributory on an ACORD 25

The ACORD 25 certificate of insurance is the standard form brokers issue to confirm coverage. Here is how to check for P&NC status:

Step 1: Look at the Description of Operations/Locations/Vehicles section at the bottom of the ACORD 25. P&NC language should appear here, typically as: "The commercial general liability policy is primary and noncontributory as required by written contract."

Step 2: Check for endorsement form numbers. The description should reference CG 20 01 or the carrier's proprietary equivalent form number.

Step 3: Verify the policy listed in the General Liability section has not expired. P&NC endorsements only exist on active policies.

Step 4: Confirm the named insured on the certificate matches the subcontractor entity in your contract. A certificate for "ABC Plumbing LLC" does not cover work performed by "ABC Plumbing Inc." They are different legal entities with different policies.

Step 5: Request the actual endorsement form. The certificate is not proof of coverage. The endorsement attached to the policy is proof.

Practical Verification Checklist

Use this checklist for every subcontractor before they start work on your project:

Contract Review

Subcontract includes specific primary and noncontributory language
Contract specifies CG 20 01 or equivalent endorsement form
Contract requires endorsement to apply to additional insured parties required by written contract

Certificate Review

ACORD 25 certificate received and dated within 30 days
Description of Operations references primary and noncontributory status
Endorsement form number is listed (CG 20 01 or proprietary form number)
Policy effective dates cover the project duration
Named insured matches the contracting entity exactly

Endorsement Verification

Copy of actual endorsement form received from sub's broker
Endorsement applies to additional insureds required by written contract
No dollar caps or percentage limits on primary contribution
No exclusions for specific claim types (bodily injury, property damage)
Edition date is acceptable (2004 or later for CG 20 01)

Renewal Monitoring

Policy renewal date tracked in compliance system
60-day advance reminder set for reverification
Updated certificate and endorsement requested at each renewal
Changes from prior endorsement form identified and reviewed

What Happens When the P&NC Endorsement Is Missing at Claim Time

Without the primary non contributory endorsement, the GC's insurer receives a tender of defense from the sub's insurer. "Tender" means the sub's insurer is asking the GC's insurer to share or take over the claim.

The GC's insurer then:

Opens a claim file under the GC's policy
Assigns defense counsel at the GC's policy's expense
Negotiates contribution with the sub's insurer
Charges any paid amounts against the GC's loss history

Even if the GC's insurer eventually negotiates the claim back to the sub's insurer, the claim file exists on the GC's loss run. Underwriters reviewing the GC's policy at renewal see the claim and factor it into premium calculations. A single $200,000 claim can increase a GC's CGL premium by $15,000 to $40,000 per year for 3 to 5 years.

Total cost of one missing P&NC endorsement: $45,000 to $200,000 in excess premium over the experience period. That is the real price of skipping verification.

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Frequently Asked Questions

Does primary non contributory apply to auto liability policies?

The CG 20 01 applies to CGL policies only. For commercial auto, the equivalent is the MCA 20 01 or a carrier-specific endorsement. Many construction contracts require primary and noncontributory on both CGL and auto liability, so verify both policies separately.

Can primary non contributory be added by blanket endorsement?

Yes. Many carriers issue blanket primary and noncontributory endorsements that apply to all additional insureds required by written contract. This is more common than scheduled endorsements that name specific parties. The blanket form simplifies administration because it activates automatically when the contract requires it.

Does the P&NC endorsement affect the sub's policy limits?

No. The endorsement changes payment order, not coverage amounts. If the sub carries $1,000,000 per occurrence and $2,000,000 aggregate, those limits remain the same with or without the P&NC endorsement. The endorsement just determines that those limits pay first and without contribution from the GC's policy.

Is primary non contributory required by law?

No state law requires primary and noncontributory endorsements. It is a contractual requirement that GCs impose through subcontract agreements. However, anti-indemnity statutes in some states (California, Texas, New York, Illinois) may limit the enforceability of P&NC provisions when the GC is partly or solely at fault.

How does primary non contributory interact with umbrella policies?

The P&NC endorsement applies to the sub's primary CGL policy. It does not automatically extend to the sub's umbrella or excess liability policy. If the claim exceeds the sub's primary limits, the GC should also require the sub's umbrella policy to be primary and noncontributory. Many GCs miss this, leaving a gap above the primary layer.

What if the sub's policy has a self-insured retention (SIR)?

The sub must satisfy their SIR before the primary and noncontributory endorsement activates. A sub with a $50,000 SIR and a P&NC endorsement must pay the first $50,000 out of pocket before their insurer begins paying as primary. If the sub cannot fund the SIR, the GC's insurer may step in and seek reimbursement later, creating the exact scenario the P&NC endorsement was supposed to prevent.