A subcontractor can win a bid, staff the crew, and still get turned away from a job site because the paperwork didn’t clear. Not permits, not licensing, a certificate of insurance that a prime contractor’s risk manager flagged as incomplete. For subs bidding larger commercial work, understanding exactly what a COI needs to show, and why, is as much a part of winning the contract as the bid itself.

Most subs treat the certificate as an afterthought, something the office manager requests from an agent the week before mobilization. On smaller jobs that habit rarely causes a problem. On larger commercial contracts, where a prime contractor’s own insurer is reviewing every sub’s paperwork before the general contractor signs off on site access, a rushed or generic COI is one of the more common reasons a subcontractor’s start date slips.

Insurance All Stars is an independent agency that works with contractors and business developers pursuing larger commercial contracts rather than smaller residential jobs, writing auto, home, life and business insurance, four lines in total, for that client base, so a subcontractor can get a certificate that actually matches a prime contractor’s requirements instead of a generic template pulled from an old job.

What Is a Certificate of Insurance, and Why Do Prime Contractors Ask for One?

A certificate of insurance, a COI, is a summary document a carrier or agent issues that shows a sub’s active coverage, limits, and effective dates. Prime contractors ask for one before mobilization so they are not carrying a sub’s risk on faith, the certificate is proof the coverage exists at the moment the crew steps on site, not a guarantee it will still be valid three months into the job.

That last distinction is why larger general contractors increasingly track COIs through dedicated compliance software rather than a shared drive folder. A tracking system flags an expiring policy 30 or 60 days out, before it lapses on an active site, instead of after a payment application gets rejected because the sub’s coverage had already run out. Subs who understand that their certificate is being monitored on a schedule, not filed once and forgotten, tend to renew ahead of the deadline instead of scrambling after a stop work notice.

Certificate of Insurance Expectations by Project Size

• Small commercial: $1 million per occurrence; Requested inconsistently; Rarely required
• Mid-size commercial: $1 million to $2 million per occurrence; Standard requirement; Increasingly requested
• Large commercial or public project: $2 million per occurrence, often with an umbrella above it; Required for ongoing and completed operations; Standard requirement

A COI a prime contractor’s risk manager is likely to flag as incomplete:

• Missing additional insured endorsement naming the prime and owner
• No waiver of subrogation where the contract requires one
• Policy dates that lapse before substantial completion
• GL limits listed below the contract’s stated minimum
• The insured entity name on the certificate doesn’t match the signed subcontract

Most of what a COI actually documents traces back to one policy, the sub’s commercial liability insurance, the coverage that responds to third party injury and property damage the sub’s crew causes on site. When an agency sets up that policy for a sub bidding larger commercial contracts, matching the certificate’s stated limits to what the prime’s contract actually requires is the difference between a COI that clears in a day and one that bounces back with a redline.

What Coverage Limits Do Prime Contractors Typically Require From Subs?

Requirements vary by project, but the direction has been consistent, more prime contractors are asking for $2 million per occurrence instead of the older $1 million standard, particularly on projects with public exposure or a tight completion schedule. That shift tracks a broader hardening in the liability market. Direct premiums written in the “other liability” line, the NAIC category general liability sits inside, rose 6.8% in 2024 to $129.2 billion, up from $121.0 billion the year before, as carriers priced in a heavier claims environment.

What Happens If a Subcontractor’s COI Lapses Mid Project?

A lapsed COI does not automatically void a sub’s underlying coverage, but it does give the prime contractor grounds to halt site access until a current certificate is on file, and on some contracts it triggers a formal notice to cure clause before payment applications are processed. Subs who track renewal dates against project schedules, not just calendar reminders, are the ones who avoid the stoppage entirely.

“A certificate of insurance is only as good as the policy behind it,” says Anthony Caracciolo, insurance agent at Insurance All Stars. “We see subs get held up on a job site because the certificate listed the wrong additional insured language or an expired date, not because the coverage itself was ever a problem.”

The Insurance Information Institute has tracked commercial lines’ incurred losses climb from $154.9 billion in 2019 to $222.5 billion in 2023, a 43.6% increase in under five years, and that trajectory is a large part of why prime contractors went from a quick certificate glance to a line-by-line review heading into 2026.

None of this changes what the underlying job requires. It changes how fast a sub gets on site once the bid is won, and a certificate that’s right the first time is still the cheapest way to avoid a delayed mobilization.

The subs who handle this well tend to do one thing differently, they read the insurance requirements section of the subcontract before they submit a bid, not after they win it. Matching the certificate to the contract in advance, rather than reacting to a redline from the prime’s risk manager, keeps a signed subcontract from turning into a scramble the week mobilization was supposed to start. It is a small step in the bidding process, but on a larger commercial contract it is often the step that determines whether a crew starts on schedule or loses the first week to paperwork.