By Patrick Turcotte, COO, Docutrax.
A subcontractor's certificate of insurance is evidence that coverage existed on the day it was issued. It is not proof that the coverage will respond, and it is not binding on the insurer. Whether the coverage responds is decided by the policy and its endorsements, not by the certificate.
That gap is the entire subject of this page. A subcontractor can hand you a clean certificate and still leave you exposed to the exact loss you required the insurance to cover.
Does a certificate of insurance prove a subcontractor is covered?
No. The clearest authority on that is the certificate itself. The ACORD 25 tells the reader, on its own face, that it does not grant what it appears to grant.
Below its disclaimer, the ACORD 25 carries a notice in substance: if the certificate holder is an additional insured, the policy must have additional insured provisions or be endorsed; if subrogation is waived, an endorsement may be required; and a statement on the certificate does not stand in for either. In ACORD's own words, the certificate "does not confer rights to the certificate holder in lieu of such endorsement(s)." (ACORD 25, 2016/03 edition.) The form the buyer is already holding directs them to go and confirm the grant, wherever in the policy it lives.
This is a matter of law, not best practice. Per New York DFS General Counsel Opinion 00-09-04, the "information only" language is statutory: it conforms the certificate to the Insurance Law, which prohibits an insurer from making a contract of insurance other than as expressed in the policy. A certificate cannot create coverage the policy does not contain.
When parties have litigated this, the outcome has followed the same logic. Where an agent issued an erroneous certificate, the policy prevailed, no additional insured status attached, and in most cases the courts have decided against the certificate holder. (Insurance Advocate, CPCU Annual Meeting panel.)
The certificate is one page. The policy behind it can run three hundred.
The coverage lives in the policy, including its exclusions, conditions, and endorsements. The certificate is a one-page summary that points at the policy without reproducing it.
Two subcontractors can present identical certificates while carrying materially different coverage. One policy names your company correctly and carries the endorsements your contract required. The other omits an endorsement, carries an exclusion that applies to the work, or names the wrong entity.
The certificate cannot show you that difference. It lists coverage types, limits, and policy dates, and it references endorsements without reproducing them. Reading the certificate tells you what the subcontractor's broker or agent typed into the form. Reading the certificates, endorsements, and policies together tells you what the coverage actually does.
This is the difference between compliant and protected. A subcontractor whose certificate matches your requirements is compliant. Whether you are protected depends on the policy underneath.
Four endorsements decide whether the coverage responds
Additional insured status is granted by endorsement to the subcontractor's policy, or by a qualifying additional insured provision built into the policy form and triggered by a written contract, not by naming your organization on the certificate. The grant on the policy is what obligates the subcontractor's insurer to defend and indemnify your organization.
For construction work, two endorsements do distinct jobs. CG 20 10 grants additional insured status for ongoing operations only; ISO revised it in 1993 specifically to rule out completed operations. CG 20 37 grants additional insured status for completed operations, the exposure that surfaces after the work is finished. They are a matched pair, and requiring only CG 20 10 leaves a gap that opens the moment the subcontractor walks off site. (IRMI, Additional Insureds and Completed Operations.)
Two further endorsements determine how the coverage behaves when it responds. A waiver of subrogation prevents the subcontractor's insurer from recovering its payout from your company after it pays a claim. Primary and noncontributory means the subcontractor's policy pays first and does not seek contribution from your own policy.
Primary and noncontributory matters because the priority of payment depends on policy wording the contract drafter does not control. Under standard ISO wording the subcontractor's policy is already primary for an additional insured, and the general contractor's own policy sits excess. But many carriers write additional insured coverage on proprietary endorsements that make it excess unless a written contract requires primary, and without noncontributory wording the subcontractor's carrier can pay a loss and then seek contribution from the general contractor's carrier. Primary and noncontributory wording forces the intended priority regardless of whose forms are in play, and bars the contribution claim. (ISO CG 00 01, Other Insurance condition; IRMI.)
A certificate can reference all four of these and still misstate them. The endorsement forms, their editions, and the entity names on them are where the coverage is either correctly built or quietly broken. Verifying that requires reading the endorsements, and where the risk is high, the full policy.
A broken endorsement still passes the certificate check
The failures that matter are not missing certificates. They are certificates that pass review while the endorsement behind them does not do what the contract assumed. These surface only when someone reads the policy.
Take the completed operations gap. A subcontractor finishes their scope, and the certificate shows additional insured status. Eight months later a defect surfaces. The general contractor tenders the claim under the subcontractor's CG 20 10 endorsement, and the carrier denies it, because CG 20 10 covers ongoing operations only and the work was completed months earlier. The contract never required CG 20 37, so the completed operations exposure was never covered. (IRMI, Additional Insureds and Completed Operations.)
Take the edition mismatch. A contract drafted around the CG 20 37 10 01 edition, then satisfied by a certificate referencing a CG 20 37 issued on the 04 13 or 12 19 edition, leaves the additional insured with narrower protection than the contract intended. The difference is in the endorsement language, not on the certificate, and it cannot be changed after a claim arises. (IRMI.)
Each of these passes a certificate check. The certificate references the endorsement, the box is ticked, and the record looks complete. The gap is in the policy, and it stays invisible until the claim is tendered.
The tender was decided months before the claim arrived
When a worker is injured or property is damaged, the general contractor tenders the claim to the subcontractor's carrier and asks that carrier to take on the defense and the loss. Whether the carrier accepts that tender was decided months earlier, at the moment someone accepted the certificate.
If the additional insured endorsement was in place, correctly written, and the policy carried no exclusion that reached the claim, the subcontractor's carrier responds and the loss transfers as intended. If the endorsement was missing, restricted, issued to the wrong entity, or sitting above an exclusion that applied to the work, the carrier can deny the tender, and the loss stays with the general contractor and its own carrier.
The consequences of a failed tender are financial and they are ordinary. The general contractor pays its deductible or self-insured retention, its own carrier absorbs the balance, and a loss the organization believed it had transferred lands on its own program. That often drives premium increases at the next renewal, and in some cases contributes to non-renewal.
None of this is visible in the certificate. The certificate looked fine. The tender still failed, because the certificate was never the thing that made the coverage respond.
The items that matter are in the policy, not on the certificate
Before a subcontractor starts work, the verifiable items sit in the policy and its endorsements, not in the certificate summary. The table below separates what the certificate shows from what actually has to be confirmed.
Requirement | What the certificate shows | What has to be verified |
Commercial general liability | Coverage types, limits, and policy dates | The policy carries no exclusion that applies to the subcontractor's scope of work |
Additional insured, ongoing operations | A reference, often "CG 20 10" | The CG 20 10 endorsement or a blanket equivalent is on the policy, in the edition the contract specifies, naming the correct legal entity |
Additional insured, completed operations | A reference, sometimes omitted entirely | The CG 20 37 endorsement or a blanket equivalent is present, because ongoing-operations status alone does not cover claims that surface after completion |
Waiver of subrogation | A checkbox or a note | The waiver endorsement is on the policy, in favor of your organization |
Primary and noncontributory | A checkbox or a note | The endorsement language is present on the policy, not merely asserted on the certificate |
Workers compensation | Coverage and limits | Coverage is active and names the correct legal entity |
Umbrella or excess | Limits | The umbrella follows form to the underlying additional insured coverage, and extends that status into the excess layer, which does not happen automatically |
The certificate is the starting point for this list. It is not evidence that any line on it is true at the policy level.
In New York, a perfect certificate can still hide a Labor Law exclusion
New York concentrates construction-liability exposure on owners and general contractors more than any other state. Labor Law section 240, the Scaffold Law, enacted in 1885, imposes absolute liability on owners and general contractors when a construction worker is injured by a gravity-related risk such as a fall from height or a falling object. The duty is non-delegable, comparative negligence by the worker is not a defense, the only recognized escape is the narrow sole proximate cause defense, and owners and general contractors can be sued even where the injured worker was employed by a subcontractor. As of May 2026, no amendment to section 240 has passed. (NY Senate, Labor Law section 240; JTNY, May 2026.)
The exposure shows up in the claims data. Per Chubb, New York sees one bodily injury general liability claim for every $2.74 million of construction payroll, against an average of one per $37 million across all other states. That is a claim frequency more than 12 times higher. (Chubb and Aon.)
Here is what the certificate cannot tell you. A subcontractor's policy can carry an exclusion for New York Labor Law losses. The certificate can be perfect, every endorsement present and correctly written, and the policy underneath can still exclude the exact exposure that drives New York construction litigation. (Chubb and Aon.) A certificate cannot show you that. An endorsement check cannot show you that. Only reading the policy shows you that.
This is why depth of review is matched to the risk of the work. Certificate-level review is sufficient for low-risk relationships. High-risk construction, and New York in particular, is where a Comprehensive Policy Review earns its place, because it is the only level at which a Labor Law exclusion is caught before a claim rather than after.
Managing subcontractor compliance means reading the endorsements, not collecting the certificate
Collecting certificates is necessary and it is not sufficient. The work that determines whether risk actually transfers is reading the endorsements and, where the exposure warrants it, the full policy, and then resolving what is missing with the subcontractor's broker or agent before the subcontractor is on site.
Docutrax runs that operation. Certificates, endorsements, and policies are reviewed by licensed P&C professionals, and construction accounts are handled by CRIS-certified Account Managers, on a base of more than 300,000 complete policy reviews since 2017. Where a subcontractor's coverage falls short of the contract, the team coordinates the correction with the broker or agent and surfaces the facts to the client.
Docutrax does not decide for the client whether to let a non-compliant subcontractor proceed. It provides the documentation and the analysis so the client can make that decision with the coverage picture in front of them.
For high-risk work, that analysis is a Comprehensive Policy Review: a line-by-line reading of the actual policy against the contract requirements, which is the level at which a failed tender is caught before it happens rather than discovered after.
Common questions
Is a certificate of insurance legally binding on the insurer? No. The ACORD 25 states on its face that it is issued for information only and confers no rights on the certificate holder. The obligation to pay comes from the policy and its endorsements. Per New York DFS General Counsel Opinion 00-09-04, a certificate cannot create coverage the policy does not contain, and that is a requirement of the Insurance Law, not a disclaimer the issuer chose to add.
Does naming my company as additional insured on the certificate make me an additional insured? No. Additional insured status comes from an endorsement on the subcontractor's policy, such as CG 20 10 for ongoing operations and CG 20 37 for completed operations, or from a qualifying additional insured provision in the policy form. The ACORD 25 itself states that the policy must have additional insured provisions or be endorsed, and that a statement on the certificate does not confer rights in place of them.
What is the difference between CG 20 10 and CG 20 37? CG 20 10 grants additional insured status for ongoing operations, and CG 20 37 grants it for completed operations, which is the exposure that appears after the work is finished. Construction work requires both, because claims can arise during the project and years after it closes. (IRMI, Additional Insureds and Completed Operations.)
Why do primary and noncontributory and waiver of subrogation matter if the subcontractor already has coverage? Primary and noncontributory keeps the subcontractor's policy paying first, rather than sharing the loss with your own policy, and bars the subcontractor's carrier from seeking contribution from yours. Waiver of subrogation stops the subcontractor's insurer from recovering its payment from your organization afterward. Without them, the coverage can exist and still leave your program absorbing part of the loss.
A subcontractor's certificate meets every requirement on our checklist. Are we protected? You are compliant, which is not the same thing. The certificate confirms the requirements were stated correctly on the form. Protection depends on whether the endorsements are actually on the policy, correctly written, and free of exclusions that apply to the work. That is confirmed by reviewing the endorsements and, for high-risk work, the full policy.
Can coverage change after we receive the certificate? Yes. A certificate is evidence of coverage on the day it was issued, and coverage can be reduced or removed afterward. Ongoing monitoring and renewal tracking exist because the certificate goes stale the moment the policy behind it changes.
