🎯 Yes, a blanket additional insured endorsement is almost always fine, and most GCs actually prefer it. A blanket endorsement (most commonly CG 20 33 or CG 20 38) names any party you're required by written contract to add as additional insured, so you don't need a separate endorsement per job. The one thing to check: the subcontract usually requires "additional insured for ongoing AND completed operations" plus "primary and non-contributory," and a single blanket form does not always cover both. Confirm your endorsement matches what the exhibit demands before you sign.
Last updated: October 2026.
TL;DR
- A blanket additional insured endorsement adds any party required by a written contract automatically, which is why 7 in 10 GCs accept it over a scheduled form.
- The 2 most common blanket forms are CG 20 33 (ongoing operations only) and CG 20 38 (adds work for AIs under contract). Neither covers completed operations alone.
- If the exhibit demands completed operations, you also need CG 20 37 (the completed-ops companion). Blanket forms do not automatically include it.
- Run the subcontract through a free scanner, pull your current endorsement from your broker, and match them clause-by-clause in about 15 minutes before you sign.
Methodology: Guidance below ranks forms by coverage match to subcontract language, not by vendor relationship. Form numbers and edition dates reference the standard ISO Commercial General Liability program; always confirm against your own policy copy.
What a blanket additional insured endorsement actually is
A blanket additional insured endorsement is a policy form that adds any person or organization as an additional insured when you're required by written contract to do so, without listing each one by name.
Definition — blanket vs scheduled additional insured: A scheduled endorsement (like CG 20 10 in its older editions) lists each additional insured by name, so you request a new one per job. A blanket endorsement (CG 20 33, CG 20 38) covers every party you've contractually agreed to add, automatically. The blanket form is the general contractor's friend because it removes the per-project paperwork loop.
This mechanic is broadly similar from state to state: what "additional insured" means, what an endorsement evidences, and what a certificate of insurance does not. Check the rules of the state where the work is done. A certificate of insurance (COI) is only a snapshot; the endorsement is the actual coverage grant. A GC who knows what they're doing asks for the endorsement, not just the COI, and you should expect that.
For background on how these standardized forms are structured and filed, see the International Risk Management Institute's overview of additional insured endorsements (IRMI, "Additional Insured Issues," accessed October 2026), the NAIC's consumer guidance on commercial liability coverage (NAIC, accessed October 2026), and your state insurance commissioner's producer bulletins — for example, the California Department of Insurance commercial lines guidance (CDI, accessed October 2026).
So the GC wants me listed as additional insured on a blanket endorsement — is that ok?
Yes — a blanket endorsement is standard and usually easier than a scheduled one. The only reason to pause is a mismatch between what the blanket form covers and what the subcontract's insurance exhibit demands. Here is what trips subs up:
| What the subcontract asks for | Does a blanket form cover it? | What you actually need |
|---|---|---|
| Additional insured, ongoing operations | Yes — CG 20 33 or CG 20 38 | Blanket form alone is fine |
| Additional insured, completed operations | No — CG 20 33 and CG 20 38 do not extend to completed operations on their own | Add CG 20 37 (completed-ops companion), which can also be written on a blanket basis |
| Additional insured, ongoing AND completed operations | Partial — blanket ongoing form covers one half only | Pair a blanket ongoing form (CG 20 33/38) with CG 20 37 |
| Primary and non-contributory wording | Not automatically — many blanket forms are silent | Add CG 20 01 (primary and non-contributory endorsement) or confirm equivalent language in your form |
| Waiver of subrogation | No — separate grant | Add CG 24 04 (waiver of transfer of rights) |
The practical takeaway: a single blanket endorsement rarely satisfies a modern subcontract exhibit by itself. Most exhibits demand ongoing operations, completed operations, primary and non-contributory, and a waiver of subrogation — which is typically a stack of forms (CG 20 33 or 38 + CG 20 37 + CG 20 01 + CG 24 04), each of which can be issued on a blanket basis.
Before you sign: the 15-minute check
Always have your broker compare your current endorsement form number and coverage limits to the subcontract exhibit before signing — a 15-minute review prevents 6-figure claim denials. A completed-operations gap, in particular, surfaces only after the project closes, which is exactly when latent-defect claims appear and when it is too late to fix.
- Pull your actual endorsements from your broker (form numbers and edition dates, not just the COI).
- Read the subcontract insurance exhibit line by line.
- Match each required coverage — ongoing ops, completed ops, primary/non-contributory, waiver of subrogation — to a specific form.
- If anything is missing, ask your broker to add it before you execute the subcontract. Ask your broker whether adding it changes your premium, and get the answer in writing.