Additional Insured vs. Waiver of Subrogation: What GCs Need to Know
Additional insured vs waiver of subrogation explained for general contractors: what each endorsement does, why subs need both, and how to verify they exist.
Additional insured and waiver of subrogation are two endorsements you require from subcontractors, and they protect you in opposite directions. Additional insured extends the sub's liability policy so it also covers you, the GC, for claims arising from the sub's work. Waiver of subrogation stops the sub's insurer from later suing you to recover what it paid on a claim. One pulls coverage toward you; the other blocks recovery against you. Most subcontracts require both — and a checkbox on the certificate is not proof either one exists.
What is additional insured status?
When a subcontractor names you as an additional insured, their Commercial General Liability (CGL) policy is amended to treat your company as an insured party, not just the sub. If a third party — a property owner, a passerby, another trade — sues over bodily injury or property damage tied to the sub's work, the sub's insurer steps in to defend and pay on your behalf, up to the policy limits.
That matters because the GC is almost always pulled into a construction claim, even when the actual work was performed by a sub. Additional insured status routes that liability to the party who created the risk and the policy you required them to carry, instead of eroding your own coverage and loss history.
CG 20 10 vs. CG 20 37: ongoing vs. completed operations
Additional insured coverage is added through specific endorsement forms. The two most common ISO forms each cover a different window of time:
| Endorsement | What it covers | Why a GC cares |
|---|---|---|
| CG 20 10 | Ongoing operations — claims that arise while the sub's work is in progress. | Covers you during the active job, e.g., an injury on site during the sub's scope. |
| CG 20 37 | Completed operations — claims that arise after the work is finished. | Covers you when a latent defect surfaces months or years after closeout. |
Construction defects often do not show up until long after a sub has demobilized. If you only secure CG 20 10 (ongoing operations) and a problem emerges post-completion, you may have no additional insured coverage when you need it most. That is why experienced GCs require both CG 20 10 and CG 20 37 — or an equivalent that spells out completed operations.
Why "blanket" via written contract matters
Some subs carry a blanket additional insured endorsement. Instead of naming each GC individually, it extends additional insured status to any party the named insured is required to add by written contract. That is convenient, but the trigger words matter: if your subcontract never actually requires the sub to name you, a blanket endorsement may grant you nothing. The coverage and your contract have to line up.
Contract language drives coverage
Endorsements like the blanket form respond to what your written agreement requires. Generic certificate language does not. Make sure your subcontract clearly states the additional insured and waiver requirements, including the specific form numbers and that completed operations are included.
What is a waiver of subrogation?
Start with subrogation. When an insurer pays a claim, it inherits the right to chase whoever caused the loss to get its money back. If a sub's insurer pays out on a fire, then decides the GC's actions contributed, it can sue the GC to recover — even though everyone was working on the same project.
A waiver of subrogation is an endorsement in which the sub's insurer agrees, in advance, to give up that right of recovery against the named party (you). After a covered loss is paid, the insurer cannot turn around and pursue you for reimbursement.
Additional insured brings the sub's coverage to you. Waiver of subrogation keeps the sub's insurer from coming after you later. You want both, because they protect against two completely different problems.
How do additional insured and waiver of subrogation differ?
They are easy to confuse because both appear in the same contract clause and on the same ACORD 25. But they do different jobs at different moments:
| Additional insured | Waiver of subrogation | |
|---|---|---|
| What it does | Makes you an insured under the sub's policy. | Gives up the insurer's right to recover from you. |
| Direction of protection | Coverage flows toward you (defense + indemnity). | Blocks a claim flowing back at you. |
| When it helps | When a third party sues over the sub's work. | After the sub's insurer has paid a loss you may have contributed to. |
| Typical form | CG 20 10, CG 20 37, or blanket form. | A waiver endorsement on GL and often workers' comp. |
Because they cover different risks, requiring only one leaves a gap. That is why nearly every well-drafted subcontract demands both endorsements together, frequently on the general liability policy and on workers' compensation as well.
Why the ACORD 25 checkbox is not proof
Here is the trap that costs GCs real money. The ACORD 25 Certificate of Liability Insurance is a one-page summary, and it says so right on the form: it is informational only and does not amend, extend, or alter the coverage in the policy. A checkmark in the "Additional Insured" column or a note that says "Waiver of subrogation applies" is arepresentation, not a grant of coverage.
The only thing that actually adds additional insured status or waives subrogation is the endorsement attached to the policy. If the certificate says you are covered but the endorsement was never issued — or names a different entity, or excludes completed operations — you find out at the worst possible time, when a claim is denied.
The certificate vs. the endorsement
Think of the ACORD 25 as a receipt that says "coverage exists." The endorsement is the coverage. To confirm you are protected, you need to see the actual endorsement form, not just the certificate. For a field-by-field walkthrough, see how to read an ACORD 25 certificate.
How do you request and verify these endorsements from a sub?
Getting it right is a short, repeatable process. Do it the same way for every sub:
- Put the requirement in the subcontract. Spell out additional insured for ongoing and completed operations (cite CG 20 10 and CG 20 37 or a blanket equivalent) and a waiver of subrogation on GL and workers' comp.
- Ask for the certificate plus the endorsements. Have the sub's agent send the ACORD 25 and copies of the actual endorsement forms. The certificate alone is not enough.
- Check that your company is the named party. Your legal entity name should appear as the additional insured (or be captured by a blanket form keyed to written contract).
- Match the form numbers and the dates. Confirm the endorsement forms match what your contract requires and that the policy effective and expiration dates cover the entire job, including the completed-operations tail.
- Re-verify at renewal. Endorsements do not carry over automatically. When the policy renews, the additional insured and waiver have to be re-issued — confirm it every time.
While you are confirming insurance, confirm the license too. A certificate can look perfect while the contractor's DBPR license is delinquent or void. You can verify a Florida contractor license against the state portal and fold it into the same intake. Our subcontractor compliance checklist walks through the full set of documents to collect before a sub starts work.
How SubShield flags missing endorsements
Catching a missing endorsement by hand means reading every certificate, cross-checking every form number, and remembering every renewal date. That is exactly the work that slips through when you are busy. SubShield automates the review:
- AI reads each uploaded ACORD 25 and pulls out coverage types, limits, policy dates, and the additional insured and waiver indicators.
- It flags when the certificate claims an endorsement but no supporting endorsement is on file — marking the sub action-needed instead of compliant.
- It checks the contractor's license status directly against DBPR and tracks W-9s alongside the insurance documents.
- It sends expiry alerts before policies and licenses lapse, so you re-collect endorsements at renewal rather than discovering the gap during a claim.
The point is not to replace your judgment — it is to make sure a missing CG 20 37 or an absent waiver never quietly passes as "covered." You can start tracking your subs and see how each certificate scores in minutes.
Not legal or insurance advice
This article is general information, not legal, insurance, or compliance advice. Endorsement forms, coverage, and contract language vary. Always verify a contractor's license status directly with the Florida Department of Business & Professional Regulation (DBPR), and confirm coverage and the actual endorsements with the insurer or a licensed agent before relying on them.
Frequently asked questions
- What is the difference between additional insured and waiver of subrogation?
- Additional insured extends your subcontractor's liability policy to also protect you, the GC, as an insured for claims arising from the sub's work — so the sub's insurer defends and pays on your behalf. A waiver of subrogation does the opposite direction: it stops the sub's insurer from later coming after you to recover money it already paid out on a claim. One pulls coverage toward you; the other blocks recovery against you. GCs typically require both.
- What is CG 20 10 and CG 20 37?
- They are standard ISO additional insured endorsement forms. CG 20 10 adds a party (like the GC) as an additional insured for ongoing operations — claims while the work is in progress. CG 20 37 covers completed operations — claims that arise after the job is finished, such as a defect that fails years later. Many GCs require both forms, or a 'blanket' endorsement that covers parties required by written contract.
- Is the additional insured checkbox on the ACORD 25 enough proof?
- No. The ACORD 25 certificate is informational only and explicitly states it does not amend, extend, or alter the policy. A checkbox or a note saying 'additional insured' does not by itself grant coverage. Only the actual endorsement attached to the policy does that. To confirm coverage, request a copy of the endorsement, not just the certificate.
- Why do general contractors require a waiver of subrogation?
- Without a waiver, if the sub's insurer pays a claim, it can turn around and sue the GC to recover that money if the GC's actions contributed to the loss. The waiver removes that recovery right, which keeps the parties from suing each other after a covered loss and protects the working relationship the contract was meant to preserve.
- How do I get the additional insured and waiver of subrogation endorsements from a sub?
- Put the requirement in your subcontract first, then ask the sub's insurance agent to send the certificate plus copies of the actual endorsements (for example CG 20 10, CG 20 37, and the waiver form). Verify your company name appears as the additional insured, the form numbers match what your contract requires, and the policy dates cover the job.
This article is general information, not legal, insurance, or compliance advice. Verify any contractor license directly with the Florida DBPR and confirm coverage and endorsements with the insurer or a licensed agent.