Legal

Certificate of Insurance (COI)

A document from an insurance company confirming the policy details a contractor or sub carries.

A COI is the proof of insurance that GCs collect from every sub before allowing them on a project. It lists the insurance company, policy number, coverage limits, policy effective and expiration dates, and any additional insureds. COIs must be tracked — expired COIs are a major liability if an incident occurs. Most GCs use insurance-tracking software to manage sub COI compliance.