What is Primary and Non-Contributory?
Primary and Non-Contributory wording prevents the subcontractor's insurer from dragging the general contractor's insurance into a shared claim payment. Here is how it works, why it matters, and how to verify it.
Primary and Non-Contributoryis an endorsement added to a subcontractor's commercial general liability policy. "Primary" dictates that the subcontractor's policy pays first when a claim occurs. "Non-Contributory" prevents their insurer from seeking proportional contribution from the hiring party's (the general contractor's) insurance policy to cover the loss.
How Primary and Non-Contributory Works
In standard insurance law, when two or more policies potentially cover the same loss, the insurers follow "other insurance" clauses to determine how costs are shared. Without Primary and Non-Contributory wording, the subcontractor's insurer may argue that the general contractor's own CGL policy should share the claim costs — even though the subcontractor caused the loss.
Primary and Non-Contributory wording overrides these default "other insurance" clauses by establishing two rules:
- Primary: The subcontractor's policy responds first. It pays defense costs and indemnification from dollar one, without waiting for the GC's policy to respond.
- Non-Contributory: The subcontractor's insurer cannot seek contribution from the GC's policy. The sub's policy absorbs 100% of the covered loss up to its policy limits before any other insurance is triggered.
This matters because if the subcontractor's insurer successfully forces contribution from the GC's policy, the GC's loss history is damaged, driving up the GC's future premiums — even though the GC did nothing wrong.
The ISO CG 20 01 04 13 Endorsement
Prior to the April 2013 ISO revision, Primary and Non-Contributory wording was typically added by manuscript endorsement — meaning each carrier drafted their own language. This created inconsistency and coverage disputes.
In the 04 13 edition, ISO introduced the CG 20 01 endorsement, which provides standardized Primary and Non-Contributory wording. This endorsement states that the named insured's policy will be primary and will not seek contribution from the additional insured's policy, but only when required by a written contract. The contract requirement means:
- The subcontract must contain a clause requiring PNC wording.
- The endorsement activates only for additional insureds designated by written agreement — it does not apply blanket PNC to all additional insureds.
Some older policies still use carrier-specific manuscript PNC endorsements. These are valid but may contain limitations not present in the standard ISO form. Always read the actual endorsement language.
Who Requires Primary and Non-Contributory and When
PNC wording is required in virtually every standard subcontract agreement in commercial construction. The entities that require it include:
- General contractors — the most common requirers. The GC wants the sub's policy to absorb 100% of any claim arising from the sub's operations before the GC's own coverage is touched.
- Project owners and developers — often require PNC wording from both the GC and all subcontractors to insulate the owner's master policy from downstream claims.
- Property managers — require PNC from service vendors so the property owner's policy is never pulled into a claim caused by a vendor.
PNC wording is almost always required alongside Additional Insured endorsements (CG 20 10 and CG 20 37) and Waiver of Subrogation. Together, these four endorsements form the standard risk transfer package in construction contracts.
Primary and Non-Contributory vs. Waiver of Subrogation
These two endorsements are frequently confused because they both prevent the subcontractor's insurer from going after the general contractor. However, they operate at different points in the claims timeline:
Controls which policy pays first. Prevents cost-sharing at the time of claim payment. The sub's policy absorbs 100% before the GC's policy is involved.
Prevents recovery after claim payment. The sub's insurer cannot sue the GC to recoup money it already paid out on the claim.
General contractors need both endorsements. Without PNC, the sub's insurer may force the GC's policy to share the initial cost. Without Waiver of Subrogation, the sub's insurer can sue the GC after paying the claim. For a full comparison, see: Primary and Non-Contributory vs. Waiver of Subrogation.
Worked Example: PNC in a Construction Claim
A GC, Meridian Builders, hires an excavation subcontractor, GroundForce Inc., on a commercial site preparation project. GroundForce strikes an underground utility line, causing $350,000 in damage to adjacent property.
Without PNC wording:Both Meridian's and GroundForce's CGL policies are triggered because Meridian is named as additional insured. GroundForce's insurer invokes the "other insurance" clause and demands that Meridian's insurer share the $350,000 proportionally. Meridian's policy pays $175,000, damaging Meridian's loss ratio and increasing their renewal premiums by 15%.
With PNC wording endorsed:GroundForce's insurer cannot invoke "other insurance" sharing. GroundForce's policy pays the full $350,000 as primary. Meridian's policy is not triggered, and Meridian's loss history remains clean.
How SubDoc Verifies Primary and Non-Contributory Wording
Relying on a project manager to manually check the Description of Operations box on a scanned PDF to confirm "PNC" or "Primary & Non-Contributory" language is a liability trap. SubDoc automates the verification:
- Description of Operations text scan: SubDoc's AI OCR reads the ACORD 25 Description of Operations field and searches for "primary," "non-contributory," and "PNC" keyword patterns.
- Endorsement form detection: Scans attached PDF pages for the CG 20 01 endorsement form or carrier-specific PNC manuscript endorsements.
- Contract requirement cross-check: Verifies the PNC wording matches the requirement set in the project's compliance template (Description of Operations mention vs. separate endorsement).
- Deficiency flagging: If PNC wording is absent or only mentioned casually in the ACORD 25 without a formal endorsement, SubDoc flags the certificate as deficient.
Common Mistakes with Primary and Non-Contributory
- Accepting Description of Operations text as proof. A broker typing "Primary and Non-Contributory" in the free-text Description of Operations box does not legally amend the policy. A formal endorsement from the carrier is required for enforcement.
- Confusing PNC with Additional Insured. Additional Insured status tells you who is covered. PNC tells you whose policy pays first. They are complementary — you need both.
- Not requiring PNC alongside Waiver of Subrogation. PNC prevents cost-sharing during a claim. Waiver prevents the insurer from suing the GC after paying. Without both, the GC is only half-protected.
- Assuming PNC applies to all additional insureds. Under CG 20 01 04 13, PNC only applies to additional insureds designated by written contract. If the subcontract does not require PNC, the endorsement may not activate.
- Not verifying PNC on renewals. A subcontractor may have PNC wording on their initial policy but lose it when they switch carriers at renewal. Annual reverification is essential.
Related Glossary Terms
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