Construction COI Verification Software: How to Track Subcontractor Insurance

A single lapsed or missing certificate of insurance can stall a construction draw, expose the owner to uncovered liability, and hold up payment to every subcontractor waiting downstream. Construction COI verification matters now because payment volume and audit scrutiny climb with every active project, and one uninsured subcontractor can turn an on-site accident into an uncovered claim.

Construction COI verification software collects, validates, and tracks these certificates across every contractor and supplier, confirming that coverage types, policy limits, and expiration dates meet the contract before funds move. Built runs this on the platform that carries $317B+ in real estate dollars and 10% of all U.S. construction spend, enforcing compliance before payment releases rather than after.

What Is a COI in Construction?

A construction COI, or certificate of insurance, is a one-page document proving that a contractor, subcontractor, or supplier carries the coverage their contract requires. It summarizes coverage types, policy limits, effective and expiration dates, the named insured, and the certificate holder.

Owners, developers, general contractors, and lenders rely on the COI to confirm each party is insured before work begins. The document doesn’t provide coverage itself. It records policies that exist elsewhere, issued by the insurer or broker on the responsible party’s behalf.

When you collect a valid COI, you shift liability for a covered accident onto the responsible party’s insurer instead of your own balance sheet. That’s why every party in the funding chain asks for one. A general contractor wants proof its subs are covered, an owner wants proof for each draw, and a lender wants proof before disbursing funds.

The COI does its job only when the coverage it describes stays active. A certificate that was valid at contract signing means nothing if the underlying policy lapsed three months into the job. Tracking the expiration date matters as much as collecting the document.

What a Construction COI Includes and What to Check

A construction COI lists the coverage types, policy limits, effective and expiration dates, named insured, and certificate holder, and each field needs to match your contract before you approve the vendor. Reading the document takes seconds. Verifying that it actually meets your requirements takes more attention.

Start with the named insured. It has to match the subcontractor’s legal business name, not a DBA or a parent entity that isn’t signing the contract. Then confirm the coverage types and policy limits meet what your agreement demands, including commercial general liability and workers’ compensation. Workers’ comp is statutorily required in most states, and general liability is the baseline for anyone on your site.

Additional insured status deserves extra scrutiny. A checkbox on the certificate isn’t proof. The status has to be backed by a policy endorsement, covering both ongoing and completed operations, or you don’t actually have the protection the box implies. Where your contract calls for it, look for a waiver of subrogation and primary and non-contributory language.

Finally, confirm the effective and expiration dates cover the full scope of work, including any closeout period after substantial completion. Commercial auto and umbrella or excess coverage apply where the work exposes you to those risks.

COI vs W9: What’s the Difference?

A COI and a W9 are both vendor onboarding documents, but they answer different questions. A W9 is an IRS tax form that captures a vendor’s legal name and tax identification number so you can report the payments you make. A COI is proof that the vendor carries the insurance coverage your contract requires.

You collect a W9 to pay a subcontractor correctly and file the right tax reporting. You collect a COI to confirm that same subcontractor is insured before they set foot on the job site. One protects your tax compliance, and the other protects you from absorbing liability for an accident that isn’t yours.

Teams often gather both at the same point in onboarding, which is why the two get confused. They aren’t interchangeable. A vendor can hand you a clean W9 and still carry no insurance, and a valid COI tells you nothing about how to report payments to the IRS. On a construction project you need both on file before work starts, and you need the COI re-verified at each draw while the W9 stays static.

How Construction COI Verification Software Works

Construction COI verification software automates the full cycle of requesting, validating, and monitoring certificates so no coverage gap slips past the payment gate. It replaces the spreadsheet-and-email approach that breaks down the moment a project carries dozens of subcontractors with different renewal dates.

The software runs through the following steps:

1. Requests documents digitally from each contractor, subcontractor, and supplier tied to the project.
2. Validates coverage against the contract, checking that coverage types, policy limits, and dates meet your requirements.
3. Flags discrepancies when a limit falls short, an endorsement is missing, or a named insured doesn’t match.
4. Sends renewal reminders automatically ahead of each expiration date.
5. Tracks expiration continuously so a policy can’t quietly lapse mid-project.
6. Verifies the COI is genuine, confirming accuracy and completeness and checking state policy databases so a certificate isn’t fake.

Good tools for tracking contractor insurance compliance also extend visibility to lower-tier subcontractors and suppliers, not just Tier 1. That closes the gap owners usually can’t see. For a deeper walkthrough of the documents that belong in every vendor file, see our guide on how to track contractor compliance documents.

Why COI Verification Matters for Owners, Developers, and General Contractors

COI verification protects both the funding chain and the liability chain, and it does so differently for each party. A gap that looks small on paper carries real cost once an accident or a draw request exposes it.

For owners and developers, a missing COI stalls the draw. Lenders verify a complete set of current certificates before releasing each disbursement, so one absent document holds up funding for the entire request. A lapse also leaves the owner exposed to uncovered liability if an incident occurs while a sub’s policy is inactive. One lien event tied to that kind of gap costs $50,000-$500,000 in legal fees and project delays.

For general contractors, an uninsured sub becomes the GC’s liability the moment something goes wrong on site. If a subcontractor’s coverage has lapsed, the claim flows up to the GC. A missing COI also slows sub payment, because the compliance gate can’t clear until the document is on file and verified.

Verification closes both risks before they land. Vetting matters at intake too, which is why we cover vetting and prequalifying subcontractors and broader vendor management in construction in separate guides.

How COI Verification Connects to Your Draw and Payments

On financed projects, the lender verifies current COIs before releasing each draw, so COI status sits directly on the payment path rather than off to the side. We enforce compliance before payment releases, which means the payment clock doesn’t start until the required document checklist is complete, with visibility that reaches lower-tier subs and suppliers.

That connection changes how a draw moves. When COI verification lives in the same system as your budgets, invoices, draws, and payments, a lapsed certificate surfaces the moment it threatens funding, not after the disbursement stalls. Construction loans accrue 20%+ interest, so every day a draw sits waiting on a missing document is interest accruing against the project.

We timestamp each document as it’s received and hold the payment gate until the checklist clears. Owners stop chasing general contractors for lower-tier sub compliance ahead of final disbursement, because the visibility already extends down the chain. The result is a draw that moves as soon as coverage is confirmed, on the same platform where the money already flows.

How Built Handles COI Verification

We track COIs, safety documents, and certified payroll automatically, so compliance status is current without anyone chasing paperwork. Built verifies each certificate for accuracy and completeness, checks state policy databases so a COI isn’t fake, and sends 30-day expiration reminders ahead of every renewal.

Compliance shows before you remit payment, not after. We enforce the document checklist as a gate, and the payment clock doesn’t start until every required certificate is on file and verified. Its visibility extends to lower-tier subcontractors and suppliers, so nothing slips through below Tier 1.

COI status connects to the same platform where you manage budgets, invoices, draws, and payments, and it integrates with Procore, Sage, QuickBooks, Yardi, and DocuSign. Procore handles field operations while we handle the financial layer, so the two work together rather than forcing a choice.

Ready to see it on your projects? Book a Demo.

Construction COI FAQs

What is a COI in construction?

A COI, or certificate of insurance, is a one-page document that proves a contractor, subcontractor, or supplier carries the insurance their contract requires. It summarizes coverage types, policy limits, effective and expiration dates, the named insured, and the certificate holder. On construction projects, owners, general contractors, and lenders use COIs to confirm each party is covered before work starts and again at each draw. A valid COI shifts liability for a covered accident onto the responsible party’s insurer instead of yours.

What’s the difference between a COI and a W9?

A COI and a W9 are both vendor onboarding documents, but they serve different purposes. A W9 is an IRS form that captures a vendor’s legal name and tax identification number so you can report payments. A COI proves the vendor carries the insurance coverage your contract requires. You collect a W9 to pay a subcontractor correctly and report it to the IRS, and you collect a COI to confirm that subcontractor is insured before they set foot on the job site.

What happens when a contractor’s insurance lapses during a project?

When a contractor’s coverage lapses mid-project, any accident, property damage, or injury that follows can become an uncovered claim that lands on the owner and general contractor. A lapsed COI also risks stalled draws, because lenders and owners verify current coverage before releasing funds. Verification software flags upcoming expiration dates in advance and sends renewal reminders, so gaps close before they become exposure. Enforcing coverage before payment keeps a single expired policy from holding up an entire draw.

Who collects COIs on a construction project?

The general contractor typically collects COIs from every subcontractor and supplier on the job. On financed projects, the lender requires the owner or developer to provide a complete set of current COIs as part of each draw request. Because coverage flows from the sub up through the GC to the owner and lender, a missing certificate anywhere in that chain can stall the whole draw. A connected platform centralizes collection so every party verifies compliance in one place before disbursement.

How do you track COIs across multiple subcontractors?

Tracking COIs at scale means centralizing every certificate, tying each one to the right vendor and project, and monitoring expiration dates continuously. Manual tracking in spreadsheets and email breaks down fast when a project carries dozens of subcontractors with different renewal dates. COI verification software requests documents digitally, validates coverage against contract requirements, flags discrepancies, and sends automatic renewal reminders. It also extends visibility to lower-tier subcontractors and suppliers, so no certificate slips through before payment runs.

What should you check on a subcontractor’s COI before approving them?

Check that the named insured matches the subcontractor’s legal business name, that coverage types and policy limits meet your contract, and that effective and expiration dates cover the full scope of work. Confirm additional insured status is backed by a policy endorsement, not just a checkbox, and look for a waiver of subrogation where your contract requires one. Verify workers’ compensation and general liability at minimum. Then track the expiration date so the policy doesn’t lapse before the job closes out.