Can One Certificate of Insurance Cover Multiple Construction Projects?
By SubDoc Editorial Team ·
A subcontractor may submit the same certificate of insurance (COI) for two jobs. Before reusing it, check what each project asks you to file and whether the supporting evidence applies to that project. Track one decision per project even when both reviews point to the same policy. A certificate summarizes insurance information and does not amend the policy. Travelers explains what a COI shows.
Separate the policy, the certificate and the project decision
The policy reference helps identify the underlying insurance. The certificate identifies the evidence provided to the holder. The project decision records whether the reviewer accepted the documents for a specific contract, scope and date. A matching policy number can help locate the right record, but it cannot answer all three questions.
Check each project’s insurance exhibit and submission instructions. GBC Construction’s sample exhibit calls for a separate certificate for each project under its requirements. BNBuilders’ broker instructions direct submitters to use the matching project upload link. These are examples of two contractors’ processes. Use the instructions for your own job.
Compare the projects before copying the evidence
| Check | What to record for each job |
|---|---|
| Agreement | Project ID, contract reference, scope and subcontractor’s legal name |
| Holder and required parties | Exact holder details and a reference to the relevant exhibit |
| Evidence requested | Certificate, required attachments and submission destination |
| Documents received | Certificate reference, policy line, policy number, dates and attachment references |
| Unresolved differences | Missing or conflicting information and the person assigned to follow up |
| Review outcome | Decision, reviewer, date and any project-specific approval reference |
If the contract calls for a separate certificate, request it through the approved intake route. If the project permits shared evidence, link to the existing file and record who confirmed that it satisfies the submission requirement. Keep any questions about whether the policy or endorsements apply with the broker or insurance reviewer.
Worked example: one electrical subcontractor on two jobs
In this fictional example, Juniper Electrical works at Oak Clinic and North Library. The office already has a certificate for Oak Clinic. The subcontractor forwards the same file for North Library, whose exhibit requests a project-specific certificate and supporting schedule.
| Project | Evidence on file | What the coordinator does |
|---|---|---|
| Oak Clinic | Oak certificate and a recorded decision | Keep the Oak review tied to its original evidence. |
| North Library | Copy of the Oak certificate, North schedule outstanding | Keep North’s review open. Request the North certificate and schedule from the producer and route them to North’s reviewer. |
The two files may eventually reference the same policy. Keep both decisions and document references. If the producer later reports a policy change, use the shared policy reference to find both project rows, then reopen the affected checks individually.
Make the request easy to answer
We have the Oak Clinic certificate for Juniper Electrical. For North Library, please send the certificate for project NL-042 and the supporting schedule identified in the attached insurance exhibit. Please confirm which policy and term the schedule belongs to and send it through the North Library intake link.
Send the request with the relevant exhibit and avoid asking the producer to certify wording beyond the policy. When the corrected packet arrives, record what was received, who reviewed it and where the decision lives. If the issue is a new policy term across one or more jobs, use the COI renewal review checklist to compare the old and new evidence by policy line.
Download the worksheet (CSV)