Additional Insured on a COI: What It Means, Why GCs Require It, and Why Workers' Comp Is Different

Here's the clearest way to think about it: your general liability policy normally covers you. When you add a GC as an additional insured, your policy now also covers them — but only for claims that arise out of your operations. It doesn't give them a blank check on your policy for anything they do on their own.

The legal mechanism is a policy endorsement — usually a CG 20 10 (ongoing operations) or CG 20 37 (completed operations), or both. These are standard ISO forms that most carriers use. When a GC asks to be added as additional insured, they typically want both: coverage while your crew is actively working on their site, and coverage after the job is done if a defect or injury surfaces later.

If you're a general contractor and you're not requiring additional insured status from every sub on every job, you're leaving yourself exposed in a way that's entirely preventable.

Here's the scenario: Your electrical sub's employee is working on the third floor of a commercial build. He falls and is seriously injured. The injured worker sues your company — the GC — because you're the one with the deep pockets and the overall site responsibility. Even if the sub was entirely at fault, you're named in the lawsuit.

If you're listed as an additional insured on the sub's GL policy, the sub's insurer steps in to defend you and cover any judgment against you arising from that sub's work. Your own GL policy doesn't have to absorb the hit. Your loss runs stay clean. Your premium doesn't spike at renewal.

Without additional insured status, you're relying entirely on your own policy — and your own insurer will likely pursue the sub's carrier for reimbursement, which takes time, costs money, and doesn't protect you in the immediate aftermath of a claim.

The practical standard for Florida commercial construction: require additional insured (ongoing + completed operations) from every sub before they set foot on your site. Verify it on the COI before work starts — not after.

This is the question that trips up contractors and GCs alike. When you look at a standard ACORD 25 certificate of insurance, you'll see a checkbox for additional insured on the GL line and the commercial auto line — but not on the workers' comp line. That's not an oversight. It's how the system is designed.

Workers' compensation insurance exists to pay benefits to your employees when they're injured on the job. It's a no-fault system — your employee doesn't have to prove you were negligent, and you can't be sued by your own employee for a work injury (with limited exceptions). The policy is entirely between you, your insurer, and your employees.

There's no mechanism to add a third party as an additional insured on a WC policy because the GC isn't a party to that relationship. The GC doesn't employ your workers. The GC isn't eligible for WC benefits. And the GC can't be named on a policy that only pays benefits to covered employees.

What the GC can get on the WC line is a waiver of subrogation — which prevents your WC insurer from suing the GC after paying a claim. That's a separate endorsement and a separate concept. (See our Waiver of Subrogation guide for a full explanation.)

So when a GC asks for "additional insured on all policies" — which happens constantly — the correct response is: additional insured on GL (and commercial auto if applicable), and waiver of subrogation on WC. That combination covers what the GC actually needs.

On an ACORD 25 certificate of insurance, additional insured status shows up in two places:

1. The checkbox: In the General Liability section, there's a checkbox labeled "ADDL INSR" (Additional Insured). This should be checked.
2. The Description of Operations box: The certificate holder's name and the scope of the additional insured status should be spelled out here. A typical entry looks like:

[GC Name] and [Property Owner Name] are included as Additional Insured on the General Liability policy on a primary and non-contributory basis for ongoing and completed operations, per written contract. Waiver of subrogation applies to the Workers' Compensation policy in favor of [GC Name].

Two phrases in that language matter a lot:

Phrase	Why It Matters
Primary and non-contributory	Means your GL policy pays first — before the GC's own policy contributes anything. Without this, the GC's insurer can argue both policies should share the loss.
Ongoing and completed operations	Covers the GC both while your crew is on site and after the job is done. Completed operations is critical for construction defect claims that surface months or years later.

Many GCs specify in their subcontractor agreements that they require primary and non-contributory additional insured status with completed operations. If your policy doesn't include these endorsements, your COI won't satisfy the contract — and you won't get on the job.

These are two separate endorsements, and both matter for construction work.

Ongoing operations (CG 20 10) covers the GC for claims that arise while your crew is actively working on the project. If your employee causes a property damage incident on day 30 of a 90-day job, this endorsement covers the GC for that claim.

Completed operations (CG 20 37) covers the GC for claims that arise after your work is finished. Construction defect claims — a roof that leaks two years later, a wall that cracks six months after completion — fall under completed operations. In Florida, the statute of limitations for construction defect claims can extend up to 10 years under Florida Statute §95.11(3)(c), which means completed operations coverage is not just a formality.

Most standard GL policies include ongoing operations additional insured by default once the endorsement is added. Completed operations is sometimes a separate endorsement that must be specifically requested. When a GC asks for additional insured, always confirm your policy includes both — and make sure the COI reflects both.

Usually not much, if anything. Most standard GL policies include blanket additional insured endorsements — meaning any party that requires additional insured status in a written contract is automatically covered, with no per-job charge and no need to notify your insurer each time.

If your policy doesn't have a blanket endorsement, you can add specific additional insured endorsements for each GC you work with. This is slightly more administrative work but typically costs $50–$150 per endorsement depending on the carrier.

The more important cost consideration is making sure your policy includes completed operations additional insured coverage. Some carriers charge a separate premium for this. For Florida contractors doing commercial or multi-family work, it's worth the cost — completed operations claims are common in construction and can be large.

Ask your agent specifically: "Does my policy include blanket additional insured for both ongoing and completed operations?" If the answer is no, ask what it costs to add it. For most contractors, it's a modest premium increase that eliminates a major source of contract friction.

Here's a scenario that plays out in Florida courtrooms regularly:

A GC hires a tile sub for a commercial restaurant build in Naples. The tile sub's employee is grouting a floor and leaves a wet surface unmarked. A building inspector slips, falls, and breaks his wrist. He sues the GC — not the tile sub — because the GC is the named party on the permit and the one with overall site control.

Scenario A — No additional insured: The GC's own GL policy defends the lawsuit. The GC's insurer pays the settlement. The GC's loss runs get a claim. At renewal, the GC's premium increases. The GC's insurer pursues the tile sub's carrier for reimbursement — a process that takes 18 months and costs both sides in legal fees.

Scenario B — GC is additional insured on tile sub's GL: The tile sub's GL policy defends the GC. The tile sub's insurer pays the settlement. The GC's loss runs stay clean. The GC's premium doesn't move. The whole thing is resolved through the sub's policy, which is exactly where the liability belonged.

The GC in Scenario B required additional insured status before the sub started work. It cost the tile sub nothing — his policy already had a blanket additional insured endorsement. It took 10 minutes to issue the updated COI. That 10 minutes protected the GC from a claim that could have cost tens of thousands of dollars in premium increases over the next three years.

If you're a GC, your subcontractor agreement should specify the following insurance requirements in writing. Written contracts are what trigger blanket additional insured endorsements — without a contract, the endorsement may not apply.

Minimum insurance requirements for Florida commercial subs:

Coverage	Minimum Limit	Additional Requirement
General Liability	$1M per occurrence / $2M aggregate	Additional insured (primary & non-contributory, ongoing + completed ops)
Workers' Compensation	Statutory (FL)	Waiver of subrogation in favor of GC
Commercial Auto	$1M combined single limit	Additional insured if sub uses vehicles on site
Umbrella / Excess	$1M–$5M (project-dependent)	Follow-form over GL and auto

The agreement should also state that the sub must provide a certificate of insurance naming the GC and property owner as additional insured before commencing work, and that failure to maintain required coverage is grounds for removal from the project.

Keep copies of every sub's COI on file for the duration of the project plus the applicable statute of limitations — in Florida, that can be up to 10 years for latent construction defects.

The process is straightforward:

1. Confirm your policy has a blanket additional insured endorsement (CG 20 10 and CG 20 37, or equivalent). If it doesn't, ask your agent to add it. This is a one-time policy change, not a per-job request.
2. When a GC sends you their insurance requirements, forward them to your agent with the GC's full legal name and address. Your agent will issue a COI with the GC listed in the certificate holder box and the additional insured language in the Description of Operations.
3. Review the COI before sending it. Make sure the "ADDL INSR" box is checked on the GL line, the Description of Operations includes "primary and non-contributory" and "ongoing and completed operations," and the WC line shows "WVSUBR" (waiver of subrogation) checked.
4. Send it to the GC. Most carriers can turn this around same day. Bright Coast Insurance issues same-day COIs for active policyholders — call or text (239) 475-0361.

If you're getting COI requests frequently, ask your agent to set up a standard template with blanket additional insured language pre-populated. This eliminates the back-and-forth on every new job and gets you on site faster.