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A primary and noncontributory endorsement is what a bid spec is really demanding when it asks your coverage to pay first and stop chasing the general contractor's insurer for a share. On an ISO (Insurance Services Office) general liability (GL) policy, that endorsement is the CG 20 01, and it works only once you have also named the GC as an additional insured. A certificate of insurance (COI) that types the words does not create the coverage.
Primary and noncontributory (P&NC) is two promises stacked together. Primary means your GL responds first to a covered claim, up to its limits, before the GC's or owner's policy is touched. Noncontributory means your insurer can't then demand the GC's insurer pay part of that loss. Together they override the standard "other insurance" clause that would otherwise split a shared claim between two policies.
Every GL policy carries an "other insurance" condition. Left alone, it treats two applicable policies as sharing the loss or pushes one into excess. A GC who has been added as an additional insured on your policy (meaning it gets protection under your coverage) doesn't want that fight. It wants a claim from your crew's work to stay off its own loss history and renewal pricing, and the CG 20 01 rewrites your other-insurance condition to do exactly that, according to IRMI.
Picture a worker hurt near your crew's install, with both you and the GC sued for $250,000. Without P&NC, your insurer and the GC's insurer could each cover a slice and then argue over the split. With the CG 20 01 in place, your GL takes the whole covered loss up to its limit and leaves the GC's policy out of it.
Most bid spec insurance requirements fold three separate demands into one "primary and noncontributory" line, and each maps to its own ISO form. You name the GC as an additional insured, add the CG 20 01 for P&NC, and often add a waiver of subrogation. Additional insured status by itself, without the CG 20 01, still leaves your insurer free to argue about splitting a claim.
| Bid spec phrase | ISO endorsement | What to hand the GC |
|---|---|---|
| "Additional insured, ongoing operations" | CG 20 10 04 13 | Adds the GC to your GL for injury or damage during active work |
| "...and completed operations" | CG 20 37 04 13 | Extends that status to claims after your work is finished |
| "Primary and noncontributory" | CG 20 01 04 13 | Your GL pays first; the insurer won't seek contribution |
| "Waiver of subrogation in our favor" | CG 24 04 | Your insurer gives up its right to recover from the GC |
The 04 13 editions are the current ISO forms. Since that 2013 update, the additional insured endorsements only trigger when a signed written contract requires the coverage, per the CG 20 10 form text. Give the GC a COI that lists each form number, and attach the endorsement pages themselves so there is nothing left to interpret.
A certificate of insurance that reads "primary and noncontributory" is informational, not coverage. The COI is a snapshot your broker issues, so it reflects coverage rather than creating it. The endorsement on the policy is what actually creates the P&NC obligation. IRMI's guidance is blunt: verify the endorsement pages, not the certificate box, which is why more general contractors now demand those pages up front instead of trusting the checked box.
Adding primary and noncontributory wording is usually a no-cost or low-cost endorsement, but it changes the order of loss on your policy. Your carrier now pays first and alone on shared claims. The premium line is small, yet the risk your insurer absorbs is real, which is why some carriers restrict the CG 20 01 on higher-hazard contractor accounts. Ask the underwriter early, since a decline on the endorsement can force you to shop the GL account before the bid is even due.
Take a $12M HVAC company bidding a hospital retrofit. The spec calls for $1M/$2M general liability, additional insured status on ongoing and completed operations, primary noncontributory wording, and a waiver of subrogation. The GL carrier issues the CG 20 10, CG 20 37, CG 20 01, and CG 24 04, usually at little or no added premium. The umbrella above the GL has to sit primary too, so the same wording carries up the tower. Hitting that umbrella bid requirement without overbuying the limit is its own exercise.
The trap is in the follow-through: one sub carried only the CG 20 10 for ongoing operations, which satisfied the spec the day the contract was signed. A year after the job closed, a duct failure triggered a property claim, and the GC tried to tender it as an additional insured. Without the CG 20 37 for completed operations, that tender had no policy to land on.
Confirm the endorsements before the bid, not after you win it. Ask your broker whether the CG 20 01, the additional insured forms, and any waiver of subrogation already sit on the policy, then request a certificate that lists each form number. Doing it early keeps a primary and noncontributory endorsement from becoming the reason a project manager holds your start date.
A quick endorsement audit before a big bid catches a missing CG 20 01 while there is still time to add it. It is the same renewal discipline that keeps an HVAC company insurance program bid-ready year-round.
Coverwatch builds the endorsement stack to match each bid spec and issues the certificate for its HVAC contractor insurance clients on a flat fee, so the forms named in the contract are the forms on the policy.
A primary and noncontributory endorsement is an add-on to your general liability policy that does two things when you have named another party as an additional insured. It makes your policy pay first on a covered claim, and it stops your insurer from later asking that party's insurer to share the cost. On an ISO general liability policy, the form is the CG 20 01. The words alone on a certificate do not do it; the endorsement has to be on the policy.
No. Additional insured endorsements like the CG 20 10 and CG 20 37 add the general contractor to your policy so they get coverage under it. The CG 20 01 is separate and controls the order of payment, making your coverage primary and noncontributory. A bid spec that asks for both is asking for two different endorsements, and additional insured status alone still leaves your insurer free to argue about splitting a claim.
Usually it is a no-cost or low-cost endorsement, because the CG 20 01 changes the order of loss rather than adding new coverage. The catch is underwriting: the endorsement shifts more of a shared claim onto your carrier, so some insurers restrict or decline it on higher-hazard contractor accounts. Confirm your carrier will attach it before you rely on the wording in a bid.
No. A certificate of insurance only reports what your policy says; it cannot change your coverage. If the certificate shows a primary and noncontributory box but the policy has no CG 20 01 endorsement, the coverage is not there. General contractors increasingly ask for the endorsement pages themselves, not just the certificate, so line up the endorsement before you submit the COI.
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