The CG 20 01 endorsement is a standard Insurance Services Office form added to a commercial general liability policy that does two things at once: it makes the named insured’s CGL policy pay first on a claim involving an additional insured, and it stops the insurer from asking the additional insured’s own carrier to chip in. Upstream parties in construction, real estate, and service work ask for it constantly, and a small drafting miss on the contract side can leave the additional insured without the protection everyone assumed was in place.
What Primary and Noncontributory Actually Mean
“Primary” means the named insured’s CGL responds first to a covered claim. Defense costs, settlements, and judgments all come out of that policy before any other insurance available to the additional insured is touched. The additional insured’s own liability policy drops into an excess position and only responds if the primary limits are exhausted.
“Noncontributory” is the second half. Under a standard CGL, when two policies cover the same loss, the insurers split the bill, either by equal shares up to the lowest limit or in proportion to each policy’s limit.1New York Office of General Services. CG 00 01 – Commercial General Liability Coverage Form The noncontributory language overrides that default. The named insured’s carrier pays alone and will not seek contribution from the additional insured’s carrier, which keeps the additional insured’s loss history clean and avoids premium increases on a policy that was never supposed to be involved.
The operative text of the endorsement says: “This insurance is primary to and will not seek contribution from any other insurance available to an additional insured under your policy.”2Independent Insurance Agents of Texas. CG 20 01 04 13 – Primary and Noncontributory – Other Insurance Condition That one sentence pulls the additional insured’s CGL out of the cost-sharing equation and converts it into pure excess coverage.
The Two Conditions That Have to Be Met
The endorsement does not switch on by itself. Two conditions must be satisfied at the same time:
- The additional insured is a Named Insured on their own separate CGL policy. The endorsement only adjusts priority between two different insurance programs, so the party seeking primary treatment has to carry their own coverage as a named insured, not just sit as an additional insured somewhere else.
- A written contract or agreement exists in which the named insured has agreed that their insurance will be primary and will not seek contribution from any other insurance available to the additional insured.2Independent Insurance Agents of Texas. CG 20 01 04 13 – Primary and Noncontributory – Other Insurance Condition
Miss either one and the endorsement sits on the policy doing nothing. The written agreement also has to exist before the loss. A contract signed afterward will not reach back and activate the endorsement.
Getting the Contract Clause Right
The most common failure point is contract language that asks for additional insured status without also asking for primary and noncontributory status. A clause reading “Subcontractor shall name Owner as additional insured” gets the additional insured endorsement but does nothing to change the order of payment, so the default cost-sharing rules apply and the whole purpose of attaching CG 20 01 is defeated.
The fix is to draft the insurance section to mirror the endorsement’s trigger. Language such as “Contractor’s CGL coverage shall be primary and noncontributory with respect to any insurance available to Owner as additional insured” closes the loop. Courts analyzing these disputes typically look at the four corners of the written contract, so vague wording tends to lose.
A Certificate of Insurance Is Not the Endorsement
More deals go wrong here than anywhere else. A certificate of insurance (ACORD 25) is a snapshot. The form itself says, in bold, that it “confers no rights upon the certificate holder” and “does not amend, extend, or alter the coverage afforded by the policies.” A note on a certificate saying coverage is primary and noncontributory means nothing if the actual CG 20 01 is not attached to the policy.
Several states have passed laws reinforcing this, making it unlawful to issue or request a certificate that purports to alter coverage beyond what the policy actually provides. Request a copy of the endorsement itself. The certificate tells you a policy exists; the endorsement tells you what the policy does.
What the Endorsement Does Not Cover
CG 20 01 applies only to the commercial general liability coverage part and the products/completed operations liability coverage part.2Independent Insurance Agents of Texas. CG 20 01 04 13 – Primary and Noncontributory – Other Insurance Condition It does not reach professional liability, auto liability, workers’ compensation, or any other line. If a contract calls for primary and noncontributory status across other coverages, each one needs its own endorsement or provision.
The endorsement also does not expand the underlying policy. If the CGL excludes pollution or employment practices liability, the additional insured gets no coverage there either. Primary and noncontributory treatment attaches only to claims that fall within what the policy already covers.
The Umbrella Gap
Umbrella and excess liability policies do not automatically inherit the primary and noncontributory status of the underlying CGL. They carry their own “other insurance” condition, which typically treats the umbrella as excess over every other liability policy, including the additional insured’s own CGL. Even a “follow form” umbrella generally follows the underlying coverage grants and exclusions, not the other insurance condition.
Picture a $3 million claim. The subcontractor’s CGL has a $1 million limit, and the subcontractor also carries a $5 million umbrella. CG 20 01 makes the CGL pay the first $1 million alone. Once that is gone, the subcontractor’s umbrella sees the additional insured’s own CGL as other insurance and refuses to drop down until that policy responds. The additional insured’s policy gets pulled into the claim anyway.
ISO introduced endorsements in 2016 (CU 24 78 for umbrella, CX 24 33 for excess) titled “Noncontributory — Other Insurance Condition,” but these address only the contribution piece, not the order of coverage. Truly closing the gap takes manuscript language on the umbrella addressing both order and contribution. If a contract calls for primary and noncontributory status “including umbrella layers,” confirm the umbrella has been separately endorsed.
Related Endorsements You Will See Alongside It
CG 20 01 establishes payment priority but does not grant additional insured status in the first place. A separate endorsement does that: CG 20 10 adds an additional insured for ongoing operations, and CG 20 37 extends coverage to completed operations after the work is finished. Without one of these, or a blanket additional insured endorsement, there is no additional insured for CG 20 01 to prioritize.
Blanket additional insured endorsements automatically pick up any party the named insured is contractually required to add. They still require a written contract. A verbal obligation will not trigger the blanket, and the party would have to be individually scheduled on the policy.
Waiver of Subrogation vs. Primary and Noncontributory
Contracts frequently require both, and they solve different problems. CG 20 01 controls which insurer pays first and whether it shares costs. A waiver of subrogation (ISO form CG 24 04) prevents the insurer from suing the additional insured after the fact to recover what it paid out.3Missouri Farm Bureau Insurance. CG 24 04 05 09 – Waiver of Transfer of Rights of Recovery Against Others to Us Without the waiver, an insurer that pays under CG 20 01 can still turn around and sue the additional insured under the policy’s “Transfer of Rights of Recovery” condition. Full protection usually means both endorsements on the policy.
State Anti-Indemnity Statutes
Nearly every state has an anti-indemnity statute restricting a party’s ability to shift liability for its own negligence to another through a contract. In a growing number of states, courts and legislatures have extended these laws to insurance requirements, including additional insured coverage and primary and noncontributory provisions.
At least six states (Arizona, Colorado, Georgia, Kansas, Montana, and Oregon) explicitly void additional insured coverage for the additional insured’s sole negligence. The logic: if a contract cannot force Party A to indemnify Party B for Party B’s own mistakes, it cannot force Party A to insure Party B for them either. Some courts reach the same result even where a statute appears to exempt insurance contracts, treating the insurance requirement as a workaround of the indemnity ban.
A CG 20 01 attached in compliance with a contract may still be unenforceable in a state whose anti-indemnity law reaches insurance. Many contracts now include savings clauses that preserve the insurance requirements to the maximum extent allowed. In states with the most aggressive anti-indemnity laws, parties sometimes use consolidated insurance programs (wrap-ups) that cover every project participant under a single policy and sidestep the issue.
What It Costs to Add
Adding CG 20 01 is generally inexpensive. Most insurers treat it as a nominal flat-fee endorsement, often ranging from no additional charge up to around $150 depending on the carrier and the risk. That is trivial compared to the contractual mess of not having it. A general contractor who requires primary and noncontributory coverage from subcontractors will usually refuse to release the site until the endorsement is confirmed, and holding up a project over a $150 form is the kind of mistake that only happens once.