What Is a Certificate of Insurance (COI) & How to Collect It?

A Certificate of Insurance (COI) is a summary from an insurer showing a subcontractor’s active insurance policies, limits, and dates. In construction, you collect COIs before a sub mobilizes to confirm coverage (General Liability, Auto, Workers’ Comp, Umbrella) and required endorsements (Additional Insured, Primary & Non-Contributory, Waiver of Subrogation). COIs help reduce risk and keep owner/lender approvals moving.

Why COIs Matter on Construction Jobs

COIs are part of your risk and compliance package—owners and lenders often require them for pay apps and closeout.

  • Verify active coverage and minimum limits before work starts
  • Confirm endorsements that shift or share risk appropriately
  • Reduce delays on AIA/progress pay apps that require proof
  • Create a clear audit trail for claims and financing reviews
 

Core Coverages & Typical Add-Ons

Request only what your contract and project risk justify.

  • General Liability (GL): bodily injury/property damage
  • Automobile Liability: owned/non-owned/hired autos
  • Workers’ Compensation & Employers’ Liability
  • Umbrella/Excess Liability (when higher limits are needed)
  • As applicable: Professional Liability, Pollution, Builder’s Risk (owner/GC)
 

Endorsements You’ll Commonly Require

COIs list policies; endorsements change how those policies respond.

  • Additional Insured (you/owner) for ongoing & completed ops
  • Primary & Non-Contributory wording
  • Waiver of Subrogation in your favor
  • Notice of Cancellation (per contract/insurer rules)

Tip: Ask for the endorsement forms (CG 20 10/20 37 or equivalents) when required—COIs alone aren’t binding.

 

Collection & Verification Workflow

Standardize the steps so subs can mobilize without last-minute scrambles.

  • Pre-award: include coverage limits and endorsements in your RFP/subcontract
  • Award: request COI directly from the sub’s broker/agent
  • Verify: check named insured, policy numbers, effective/expiration dates, limits, and endorsements
  • Track: log expiration dates; request renewals 15–30 days prior
  • Gate: require valid COI on file before site access or payment
 

Tie COIs to Subcontracts, Site Access & Billing

Make compliance part of your normal project rhythm.

  • Attach COIs to the subcontractor’s project record
  • Include COI status on your pre-mobilization checklist
  • Review COI status during pay-app review; request updates if expired
  • Store final COIs/endorsements with closeout documents
 

Common Pitfalls (and Easy Fixes)

A few oversights cause most compliance issues.

  • Expired policies: track expirations and automate renewal reminders
  • No endorsements: ask the broker for specific forms, not just COI notes
  • Wrong entity: named insured must match the subcontractor’s legal name
  • Coverage gaps: verify limits and classifications match the scope
 

How Werx Fits Your COI Process

Keep your documentation with the work it supports.

  • Attach COIs and endorsement PDFs to the project/subcontract record
  • Track required documents alongside AIA/progress billing
  • Centralize notes and reminders with your project files
  • Sync invoices and payments to QuickBooks Online while keeping compliance docs up to date
 

FAQs About Certificates of Insurance

 

Are COIs legally binding?

No. A COI summarizes coverage but doesn’t change the policy. Endorsements and the policy itself control what’s covered—request those forms when your contract requires them.

When should I collect a COI?

Before mobilization and before approving the first pay app. Re-verify on renewal or if scope changes require different limits.

Do I need to be listed as Additional Insured?

Often yes—if your contract requires it. Ask for AI endorsements for ongoing and completed operations, plus Primary & Non-Contributory wording.

 

TL;DR Recap

  • Collect COIs pre-mobilization with required endorsements
  • Verify dates, limits, entities, and attach the actual endorsement forms
  • Track expirations and renew 15–30 days ahead
  • Store COIs with the subcontract and reference during pay-app review