The CG 20 10 Trap: Why Ongoing Operations Leaves You Exposed to Completed Claims

What CG 20 10 actually covers

CG 20 10 is the ISO endorsement titled Additional Insured, Owners, Lessees or Contractors, Scheduled Person or Organization. It adds the party named in its schedule as an insured on the subcontractor's commercial general liability policy. It does not hand that party the whole policy. It grants coverage for a defined slice of liability, and since the 10 93 edition that slice has been tied to the named insured's "ongoing operations" performed for the additional insured.

Ongoing is the word that matters. The endorsement responds while the subcontractor's crew is on site doing the work. Later editions spell out the boundary with an express exclusion: no coverage for bodily injury or property damage that occurs after all work on the project is complete, or after the portion of the work that caused the loss has been put to its intended use by anyone other than another contractor working on the same project.

For a general contractor, that is a narrow window. The expensive construction claims are rarely the ones that happen while the scaffold is up. They are water intrusion, cracked slabs and failed connections that surface months or years after turnover, when the only part of the subcontractor's policy still in play is the products-completed operations hazard.

How the edition dates changed the deal

The edition date printed in the footer of the form tells you which deal you actually got. Six editions come up again and again in contract exhibits and coverage disputes, and each one moved the line between what the additional insured gets and what it does not:

• 11 85: covered liability arising out of "your work" for the additional insured, which courts have generally read to include completed operations. Some contracts still demand this edition by name, and few carriers will issue it.
• 10 93: narrowed the grant to "your ongoing operations". Completed operations status for the additional insured disappeared from the standard form.
• 10 01: ISO introduced CG 20 37, Additional Insured, Owners, Lessees or Contractors, Completed Operations, as the separate endorsement that restores completed operations status.
• 07 04: replaced "arising out of" with "caused, in whole or in part, by" the named insured's acts or omissions, removing coverage for the additional insured's sole negligence.
• 04 13: added "only to the extent permitted by law", limited coverage to what the written contract requires, and capped the limits at the lesser of the contract requirement or the policy limits.
• 12 19: removed the reference to limits "shown in the Declarations" and states that the endorsement does not increase the applicable limits, which matters when a per-project aggregate endorsement such as CG 25 03 sits on the policy.

Why the causation wording matters as much as the date

The 07 04 editions replaced "arising out of" with "caused, in whole or in part, by" the named insured's acts or omissions. The phrase sounds generous. Courts have not always read it that way. In Burlington Insurance Co. v. NYC Transit Authority (2017), New York's Court of Appeals held that the language reaches only injury proximately caused by the named insured, not every injury with a but-for connection to the subcontractor's work.

The practical effect is that the general contractor is covered when the subcontractor's negligence is at least a proximate cause of the loss. If the facts point to the general contractor alone, the additional insured grant may not respond at all. Early in a case, before fault is sorted out, carriers often accept the defense under a reservation of rights on exactly this point.

So the edition date and the causation wording both belong in your review. A certificate remark that reads "CG 20 10 per written contract" tells you neither.