Risk Shift to Subs via Additional Insured and Waiver of Subrogation

Why this matters

When a sub's worker drops a wrench off a scaffold and hits a customer's car, your General Liability insurer pays the claim and then subrogates back against the sub. When the sub has properly named your business as an Additional Insured under their CGL policy with a Waiver of Subrogation, the sub's carrier covers the loss without your loss ratio absorbing the hit. That is the core mechanic of commercial risk transfer. Get the language wrong on the sub's COI and you eat the loss on your own policy, your EMR climbs, and your renewal premium follows.

The three legs of contractual risk transfer

A defensible risk transfer to a subcontractor stands on three legs. Missing any one breaks the structure.

Leg 1: Indemnity clause in the subcontract

A written indemnity clause requiring the sub to defend, indemnify, and hold harmless your business (and the upstream owner / GC) for claims arising from the sub's work. State anti-indemnity statutes (California Civil Code 2782, New York General Obligations Law 5-322.1, Texas Insurance Code Chapter 151) restrict or void broad-form indemnity. Most states permit comparative-fault indemnity. Use the strongest clause the governing state permits.

Leg 2: Additional Insured status on the sub's CGL

The sub names your business as an Additional Insured (AI) on the sub's Commercial General Liability policy. The specific ISO endorsement forms matter:

• ISO CG 20 10 04 13 (or later) for ongoing operations
• ISO CG 20 37 04 13 (or later) for products and completed operations

These two endorsements together cover claims arising during the work AND claims arising after the work is complete (typical statute of repose 4 to 10 years depending on state). Older endorsement editions and blanket "as required by contract" wordings have been narrowed by carriers over the past two decades; require the current edition by form number on the COI.

Leg 3: Waiver of Subrogation by the sub's carrier

Without a Waiver of Subrogation endorsement on the sub's policy, the sub's carrier can pay you as an Additional Insured and then turn around and sue your business in subrogation for any portion of the loss attributable to your fault. The Waiver of Subrogation (commonly ISO CG 24 04 for CGL and a separate endorsement on the Workers' Comp policy, WC 00 03 13) prevents that.

What the COI must show

• Coverage types and limits meeting contract requirements
• AI for ongoing AND completed operations, by ISO form number and edition
• Primary and Non-Contributory to your own policy
• Waiver of Subrogation in your favor on both CGL and Workers' Compensation
• Per-project Aggregate (CG 25 03)
• 30-day notice of cancellation by endorsement (standard COI cancellation language no longer binds carriers)

A COI checkbox alone does not bind coverage. Require copies of the actual endorsement pages.

The five COI failures that destroy risk transfer

1. AI by blanket wording (no specific form number) and an older edition limiting coverage to work BY the named insured FOR the additional insured, not by the named insured's subs
2. AI on CGL only, not on Umbrella (Umbrella must follow form for the AI extension to reach excess layers)
3. Waiver of Subrogation missing on the Workers' Comp policy; without it the WC carrier sues you to recover medical and indemnity payments
4. Coverage written excess of (not primary to) your policy, dropping your business as first-loss-payer
5. AI status only for duration of work performed, with no completed operations endorsement; post-Substantial Completion claims fall on your policy

Anti-indemnity statute landscape

State anti-indemnity statutes restrict indemnity clauses in construction contracts:

• Type I broad-form indemnity (sole negligence of indemnitee): generally voided in construction
• Type II intermediate-form: voided in many states, limited in others
• Type III comparative-form (indemnitor's own fault): generally enforceable

When the indemnity clause is voided, Additional Insured status typically survives because courts treat it as contractual additional insurance, not contractual indemnity. The AI leg is non-negotiable even when the indemnity leg is partially voided.

Subcontract language checklist

• Insurance Requirements exhibit listing coverage types, limits, endorsement forms by number and edition
• Indemnity clause drafted to the strongest enforceable language under the governing state
• Condition precedent that work shall not commence until compliant insurance is delivered
• Right to withhold payment if insurance documentation lapses
• Flow-down provision requiring equivalent requirements on any sub-subcontractor

Workers' Compensation and action-over exposure

When a sub's injured worker sues your business because the sub's WC bar prevents direct suit against the sub, you are exposed under the third-party-over (or action-over) doctrine. Defenses:

• Sub's CGL must include a contractual liability endorsement covering action-over claims
• Sub's WC policy must include Waiver of Subrogation in your favor
• Your CGL should include Action-Over coverage (excluded or sub-limited by some NY carriers)

New York Labor Law Sections 200, 240, and 241 create strict liability scaffolding exposure for upstream contractors no indemnity clause can fully transfer. Carry adequate Umbrella limits in New York regardless of the sub's stack.

Annual COI tracking discipline

• Calendar each sub's policy expiration 45 days in advance
• Suspend work authorization on COI lapse, not at first invoice rejection
• Maintain a digital file of every COI and endorsement page for the duration of the statute of repose in your operating states (commonly 6 to 10 years after Substantial Completion)
• Audit a sample of COIs annually against the current ISO endorsement editions; carriers update editions and older editions narrow coverage

References

• ISO Commercial General Liability endorsement forms CG 20 10, CG 20 37, CG 24 04, CG 25 03
• California Civil Code 2782 (anti-indemnity statute)
• New York General Obligations Law 5-322.1 (anti-indemnity statute)
• Texas Insurance Code Chapter 151 (Construction Anti-Indemnity Act)
• New York Labor Law Sections 200, 240, and 241 (Scaffold Law)
• ACORD Certificate of Insurance Form 25
• AIA A201 General Conditions of the Contract for Construction, Article 11 (Insurance and Bonds)