GC Job Endorsement: Is It Worth Adding for One Job?

🎯 Getting an endorsement added for one GC job is worth it when the subcontract's insurance exhibit names additional insured, primary and non-contributory, or waiver of subrogation as a precondition to signing — because without the right endorsement, your certificate of insurance (COI) is just paper the GC's portal will reject. A CG 20 10 or CG 20 37 additional insured endorsement is added to your policy, not bought per job; ask your broker what the insurer charges, if anything. Skip the add-on only if the exhibit doesn't require it in writing, or if the endorsement you already carry (a blanket additional insured form) already covers "any person required by written contract."

Last updated: October 13, 2026.

TL;DR

• A single-project additional insured endorsement is added to your policy, not billed per job — the GC job requirement rarely justifies a new policy.
• Worth it IF the subcontract exhibit requires additional insured, primary and non-contributory, or waiver of subrogation in writing. Skip IF you already carry a blanket endorsement reading "when required by written contract."
• Check your current policy for a blanket CG 20 10 / CG 20 37 before paying your broker to add a scheduled one — many commercial GL policies written for trades already include blanket additional insured language.
• The certificate (COI) does NOT grant coverage. Only the endorsement does. A GC that accepts a COI without the endorsement is accepting paper, not protection.

Definition box

Endorsement: A form attached to your insurance policy that changes what the policy covers or who it protects. An additional insured endorsement (commonly CG 20 10 for ongoing operations, CG 20 37 for completed operations) extends your general liability coverage to protect the GC named in your subcontract. The certificate of insurance (COI) only reports that an endorsement exists — it does not create coverage. If the endorsement isn't on the policy, the COI is evidence of nothing.

Is it worth getting an endorsement added for one GC job?

Yes, if the subcontract's insurance exhibit lists additional insured, primary and non-contributory, or waiver of subrogation as a requirement — and no, if you already carry a blanket version of that endorsement. What decides it is the written exhibit. A scheduled additional insured endorsement for one project is a policy change your broker requests from the insurer; ask what the insurer charges for it, if anything.

The real question is not "is the endorsement cost for a single job worth it." It's "does my policy already evidence what this GC's exhibit demands?" Answer that first and you may not pay anything at all.

Here is what flips the answer.

Worth it IF:

1. The exhibit names a specific endorsement form — CG 20 10, CG 20 37, or "additional insured per CG 20 10 10 01." If the GC's compliance portal checks for an exact form edition and you don't carry it, no COI language will substitute. You need the form added before you can clear onboarding.
2. The exhibit requires "primary and non-contributory" wording — this is a separate endorsement (often CG 20 01) that changes how your policy responds relative to the GC's own coverage. A standard additional insured form alone does not supply it.
3. The exhibit requires a waiver of subrogation — typically added via CG 24 04, this prevents your carrier from recovering against the GC after a claim. Many subcontracts demand all three together.
4. You currently carry no additional insured language at all — some GL policies exclude additional insureds entirely. In that case, adding a scheduled endorsement for the project is necessary.

Skip it IF:

1. You already carry a blanket additional insured endorsement reading "any person or organization when required by written contract" (common blanket forms include CG 20 33 and CG 20 38). If the subcontract merely requires additional insured status — without naming a specific form edition — your blanket form likely already satisfies it. Have your broker confirm the blanket form's edition date meets the exhibit.
2. The exhibit does not require it in writing. A verbal request from a project manager is not a contractual precondition. Do not pay to modify your policy for a requirement that isn't in the signed exhibit.

How to check before you pay

1. Open your current GL policy and look for form numbers beginning CG 20 or CG 24 on the schedule of forms. A blanket form will reference "written contract" language rather than a named entity.
2. Read the subcontract's insurance exhibit line by line. Highlight each of: additional insured, primary and non-contributory, waiver of subrogation, and any named form edition.
3. Match the two. Anything the exhibit demands that your policy doesn't evidence is what you ask your broker to add — and only that.
4. Request the actual endorsement, not just an updated COI. The COI reports; the endorsement protects.

Authority references

• ISO commercial general liability program forms (including the CG 20 10 and CG 20 37 additional insured series) are the industry-standard endorsements referenced in most construction subcontracts. See Verisk/ISO's commercial lines form documentation (accessed October 2026): https://www.verisk.com/insurance/products/iso-forms/
• For guidance on how additional insured and certificate-of-insurance requirements are regulated, see the National Association of Insurance Commissioners' consumer and industry resources (accessed October 2026): https://content.naic.org/
• For construction-industry contracting practice on insurance exhibits and endorsement requirements, see the Associated General Contractors of America (accessed October 2026): https://www.agc.org/