Additional Insured, Primary and Non-Contributory — Explained

Why anyone asks for additional insured status

When a general contractor hires you, they inherit exposure they didn't create. If your employee drops a tool on a passerby, the injured party sues everyone with a name on the project — you, the GC, the owner, the property manager, sometimes the lender. The GC's own policy will defend them, but it will also produce a claim on their loss history and drive up their rates for damage that came out of your work.

Additional insured status solves that by extending your General Liability to cover them for liability arising out of your operations. Their defense and indemnity for your work comes off your policy, not theirs. That's why it appears in essentially every construction contract in New Jersey, and why the endorsement — not the certificate — is what actually matters.

Ongoing operations vs. completed operations

The two standard ISO forms most contracts are describing:

• CG 20 10 — ongoing operations. Protects the additional insured for liability arising from your work while it's in progress. Coverage effectively ends at completion.
• CG 20 37 — completed operations. Protects them for claims arising from your work after it's finished.

Most defect and property-damage claims in construction surface after the job closes — a leak in year two, a failed connection in year five. If your endorsement covers ongoing operations only, the GC discovers the gap at exactly the wrong moment, and their carrier comes after you for the difference.

Read your contract's insurance exhibit: "additional insured on a primary and non-contributory basis for both ongoing and completed operations" is the standard ask. That phrase means at least three separate endorsements.

Blanket vs. scheduled endorsements

A scheduled additional insured endorsement lists specific named parties. Accurate, but slow — each new GC means an endorsement request, a carrier turnaround, and a delay before you can hand over a compliant certificate.

A blanket additional insured endorsement grants status automatically to any party you've agreed in a written contract, executed before the loss, to add. That's the practical choice for a working contractor: you sign the subcontract, and the coverage attaches without a phone call.

Two things to verify on your blanket form:

• Does it include completed operations, or ongoing only? Many blanket forms are ongoing-only unless upgraded.
• Does it require a written contract executed prior to the loss? Nearly all do — a handshake deal or a contract signed after the accident doesn't trigger it.

Primary and non-contributory, in plain terms

Suppose both your policy and the GC's policy could respond to the same claim. By default, the "other insurance" clauses in both policies make them share the loss proportionally, and the two carriers spend months arguing about the split while the claim sits.

Primary and non-contributory wording removes the argument: your policy pays first, in full, up to its limit, and the GC's policy contributes nothing until yours is exhausted. It's what every serious owner and GC requires, and it is a real endorsement with a real premium — it is not something an agent can simply type onto a certificate.

Waiver of subrogation — the third piece

After your carrier pays a claim, it normally has the right to recover from whoever caused the loss. A waiver of subrogation surrenders that right against a named party, so your carrier can't pay the claim and then sue the GC or owner for it.

Contracts usually require the waiver on General Liability, Commercial Auto and Workers Comp. The Workers Comp waiver is separate, is filed at the state level, and typically costs a percentage of the Workers Comp premium — often 2–5%. Bind it before work starts; carriers don't grant waivers retroactively once a loss has occurred.

What it costs and how contractors get burned

On a typical small NJ contractor program, the whole package — blanket AI with completed operations, primary and non-contributory, blanket waiver of subrogation — is usually a modest addition to the General Liability premium plus a percentage-based charge on the Workers Comp side. It is dramatically cheaper than losing the job or breaching the contract.

The ways subs get burned are consistent:

• Signing a contract before reading the insurance exhibit. You've now promised coverage you may not carry. That's a breach whether or not a claim ever happens.
• Assuming the certificate creates the coverage. It doesn't. The endorsement does.
• Buying ongoing-operations-only coverage and discovering the gap when a completed-operations claim lands.
• Agreeing to indemnity broader than the insurance. A contract can obligate you for liabilities no policy will pay. In New Jersey, indemnity language must be explicit to shift liability for the indemnitee's own negligence — read it, and have it read.

The right sequence

1. Get the insurance exhibit before you sign. Send it to your agent.
2. Bind the endorsements you actually need — blanket AI with completed operations, primary and non-contributory, waivers on GL, Auto and WC.
3. Confirm your limits meet the requirement, including the umbrella.
4. Issue the certificate — which is now just a printout of coverage you own.
5. Collect the same from every sub you hire. Here's the COI checklist.

Frequently asked

Want this sorted for your own operation? Quote your whole program in one intake — GL, Workers Comp, Commercial Auto, Tools & Equipment, Umbrella and Builders Risk — or talk to a producer. Same business day.