The cg 2010 endorsement is the most widely used additional insured endorsement in commercial construction. It adds the general contractor as an insured party on the subcontractor's CGL policy for claims arising from the sub's ongoing operations. But not all CG 20 10 editions are equal, and not all states treat them the same way.

Three editions of the CG 20 10 exist: 2001, 2004, and 2019. Each one narrows the coverage available to the additional insured. GCs who accept any edition without checking the version number risk discovering coverage gaps only after a claim hits.

This guide breaks down each edition, maps state-by-state acceptance patterns, and walks through real scenarios where the wrong CG 20 10 version left GCs exposed.

The Three Editions of the CG 20 10

2001 Edition (CG 20 10 07 04)

The 2001 edition provides the broadest coverage for additional insureds. Its coverage trigger is based on the named insured's (the sub's) "acts or omissions" rather than limiting coverage to specific operation types.

Key features:

Coverage triggered by the sub's negligence in connection with their operations
No explicit exclusion of completed operations claims
Courts in multiple states have interpreted the broad language to extend coverage beyond ongoing operations
Most favorable edition for GCs

2004 Edition (CG 20 10 12 04)

ISO narrowed the coverage in 2004 by adding language that explicitly limits additional insured coverage to "ongoing operations" performed by the named insured. This edition requires a separate CG 20 37 endorsement for completed operations protection.

Key features:

Coverage limited to bodily injury or property damage caused by the sub's "ongoing operations"
Completed operations explicitly excluded (requires CG 20 37)
"Ongoing operations" defined as work being performed at the time of the occurrence
Industry standard for most construction contracts since 2005

2019 Edition (CG 20 10 12 19)

The 2019 edition added further restrictions. It tightened the connection between the additional insured's coverage and the named insured's work, and introduced language that some courts interpret as limiting coverage to the additional insured's vicarious liability only.

Key features:

Coverage limited to liability "caused, in whole or in part, by" the named insured's acts or omissions
Additional restrictions on the scope of covered operations
Some jurisdictions interpret this as excluding coverage for the GC's own partial negligence
Least favorable edition for GCs

Edition Comparison Table

Feature	2001 Edition	2004 Edition	2019 Edition
Ongoing operations	Yes	Yes	Yes
Completed operations	Arguably yes (court-dependent)	No (requires CG 20 37)	No (requires CG 20 37)
GC's sole negligence	Potentially covered	Excluded in most jurisdictions	Excluded
GC's partial negligence	Covered	Covered in most jurisdictions	Disputed by carrier
Coverage trigger	Sub's acts or omissions	Sub's ongoing operations	Sub's acts in whole or part
GC preference ranking	1st	2nd	3rd

State-by-State CG 20 10 Acceptance Patterns

State anti-indemnity laws directly affect how the CG 20 10 endorsement functions. These laws limit the ability of one party to transfer liability to another through insurance requirements.

Broad Form States (Most GC-Friendly)

These states allow additional insured coverage for the GC's own negligence, making all CG 20 10 editions functional:

Alaska: No anti-indemnity statute for construction. All editions enforceable.
Delaware: No restrictions on additional insured scope. 2001 edition preferred.
Massachusetts: No anti-indemnity statute. Broad additional insured coverage permitted.
Vermont: Limited restrictions. All editions generally accepted.

Intermediate Form States

These states allow additional insured coverage except for the GC's sole negligence:

California (Civil Code 2782): Additional insured coverage valid for the GC's partial negligence but void for GC's sole negligence or willful misconduct. The 2004 edition is the practical standard. The 2001 edition's broader language may not provide extra protection due to the statute.
Florida (Statute 725.06): Allows additional insured coverage for vicarious liability. GC's active negligence coverage is limited.
Colorado (C.R.S. 13-21-111.5): Proportionate liability standard. Additional insured coverage limited to the sub's fault proportion.
Oregon (ORS 30.140): Voids indemnification for sole negligence. Additional insured endorsement functions for shared fault.

Restrictive States

These states significantly limit additional insured coverage, making the CG 20 10 edition less impactful because the statute controls regardless:

New York (GOL 5-322.1): Voids agreements requiring a sub to provide coverage for the GC's negligence. Additional insured coverage limited to the sub's negligence only. The CG 20 10 edition matters less here because the statute overrides expansive endorsement language.
Texas (Insurance Code 151): Restricts additional insured coverage to the GC's vicarious liability arising from the sub's work. All editions function similarly under this restriction.
Illinois (740 ILCS 35): Construction anti-indemnity statute limits additional insured coverage. Recent court decisions have further narrowed enforceable coverage.

No Statute States

Several states have no specific construction anti-indemnity statute, relying on common law:

Georgia, Missouri, North Carolina, South Carolina, Wisconsin: Coverage scope determined by contract language and endorsement edition. The 2001 edition provides the broadest protection in these states.

Scenario 1: The Wrong Edition on a Hospital Project

A GC in Colorado hired a mechanical sub to install HVAC ductwork on a 4-story hospital. The contract required the CG 20 10, but did not specify an edition year. The sub's carrier issued the 2019 edition.

During installation, a worker from another trade tripped over ductwork that the mechanical sub left in a corridor. The worker sued both the mechanical sub and the GC. The GC tendered the claim to the mechanical sub's insurer under the additional insured endorsement.

The sub's insurer denied the GC's tender. Their argument: the 2019 edition only covers liability "caused, in whole or in part, by" the sub's acts. The sub's ductwork was properly placed per the approved plan. The worker's own inattention caused the trip. The sub's insurer argued the GC could not demonstrate the sub's acts caused the injury.

Under the 2001 edition, the broader "acts or omissions" language would have covered the GC because the ductwork was the sub's work product. Under the 2004 edition, the GC would have had a stronger argument that the claim arose from "ongoing operations." The 2019 edition gave the carrier enough room to deny.

The GC's own insurer paid $185,000 in defense and settlement costs. The GC's loss run now carries that claim for 5 years.

Lesson: Specify acceptable edition years in your contract. "CG 20 10 (2004 edition or equivalent)" prevents carriers from substituting restrictive versions.

Scenario 2: Completed Operations Gap in Florida

A GC completed a condominium project in Miami. Two years after substantial completion, water intrusion through a balcony waterproofing membrane caused $420,000 in interior damage. The condo association sued the GC.

The GC held additional insured status on the waterproofing sub's CGL policy via the CG 20 10 (2004 edition). But the 2004 CG 20 10 explicitly excludes completed operations. The GC had not required a CG 20 37 (completed operations additional insured endorsement).

The sub's insurer denied the GC's tender. The claim arose 2 years after the sub completed work, placing it squarely in the completed operations category. Without the CG 20 37, the GC had no additional insured coverage for this claim.

The GC's own policy covered the defense, but the $420,000 claim drove a 22% premium increase at the next renewal, adding approximately $65,000 per year in additional insurance costs.

Lesson: The CG 20 10 (2004 or 2019) covers ongoing operations only. Always pair it with the CG 20 37 for completed operations protection.

Scenario 3: State Law Overrides the Endorsement in Texas

A GC on a Dallas office building required the CG 20 10 (2001 edition) from all subs. The electrical sub provided the requested endorsement. During construction, a fire started due to a combination of the electrical sub's faulty wiring and the GC's failure to maintain proper fire watch procedures.

The building owner sued both the GC and the electrical sub. The GC tendered to the electrical sub's insurer under the 2001 CG 20 10 endorsement, which arguably covered the GC's own negligence due to its broad language.

The sub's insurer denied coverage for the GC's proportionate fault. Under Texas Insurance Code Chapter 151, additional insured coverage is limited to the GC's vicarious liability arising from the sub's work. The GC's independent negligence (failure to maintain fire watch) fell outside the statutory allowance, regardless of what the endorsement language said.

The GC's own policy covered the GC's proportionate share of the claim. The 2001 edition's broader language provided no additional benefit in Texas because the statute controlled.

Lesson: Know your state's anti-indemnity law. The endorsement edition matters most in states with broad-form or no anti-indemnity statutes. In restrictive states, the statute limits coverage regardless of the edition.

Practical Recommendations for GCs

Specify the CG 20 10 edition year in every subcontract. Accept the 2001 or 2004 edition. Reject the 2019 edition unless no alternative exists.
Always pair the CG 20 10 with the CG 20 37 for completed operations coverage. This is non-negotiable on any project with a statute of repose longer than 1 year.
Map your projects to state anti-indemnity laws. Understand which states limit your additional insured protection regardless of endorsement edition.
Request the actual endorsement form, not just the certificate of insurance. The certificate does not show the edition year in a reliable format.
Verify the edition at every policy renewal. Carriers can change editions at renewal without notifying the GC.

See how SubcontractorAudit automates CG 20 10 endorsement verification across every sub and every project. Schedule a demo to see endorsement tracking in action.

Frequently Asked Questions

Can I require the 2001 CG 20 10 edition from subs?

You can require it, but many carriers no longer issue the 2001 edition. Since ISO released the 2004 and 2019 updates, most carriers have transitioned to the newer forms. If a sub's carrier only offers the 2019 edition, you may need to accept it or require the sub to find a carrier that offers the 2004 edition.

Does the CG 20 10 cover the project owner if they are also named as additional insured?

Yes, if the endorsement is blanket (applying to all additional insureds required by written contract) and the contract requires the project owner to be added. If the endorsement is scheduled, the owner must be specifically listed on the schedule.

What is the difference between CG 20 10 and CG 20 38?

The CG 20 38 combines ongoing and completed operations additional insured coverage in a single endorsement. It is functionally equivalent to requiring both CG 20 10 and CG 20 37 separately. Some carriers prefer issuing CG 20 38 as a single form for administrative simplicity.

How do I identify the CG 20 10 edition on a certificate?

The form number includes the edition date. "CG 20 10 07 04" is the 2001 edition (published July 2004). "CG 20 10 12 04" is the 2004 edition (published December 2004). "CG 20 10 12 19" is the 2019 edition (published December 2019). The edition date appears after the base form number.

Can a sub carry multiple CG 20 10 editions on the same policy?

No. A policy carries one edition of the CG 20 10 at a time. The edition is determined by the carrier's filing and the policy form set. However, a sub working multiple projects for different GCs provides the same edition to all GCs because the endorsement is policy-level, not project-level.

Does the CG 20 10 provide defense cost coverage for the additional insured?

Yes. The additional insured has the same right to defense under the sub's policy as the named insured, subject to the endorsement's coverage scope. Defense costs are paid within the policy limits unless the policy has a separate defense cost provision (duty to defend outside limits), which is uncommon in standard CGL forms.