Certificate of Insurance for Construction: Coverage, Endorsements & Tracking

A certificate of insurance (COI) is the document that confirms a contractor or subcontractor on a construction project is carrying the coverage your contract requires at the time of issue. In an industry that put $2.154 trillion worth of work in place in the United States in 2024 alone, the stakes behind that proof are substantial.

Construction projects run on layered subcontractor relationships, each with its own coverage types, policy expiration dates, and endorsement requirements. A single project can involve dozens of subs across multiple trades, all requiring verified COIs before they touch the job site. Construction businesses faced 212,582 legal filings in 2022, the third-highest total of any U.S. industry. Compliance gaps are a direct contributor to that exposure.

This guide covers what a COI in construction includes, which coverage types and endorsements your contracts should require, and how construction firms manage compliance across large subcontractor rosters without letting anything fall through the cracks.

What Is a Certificate of Insurance in Construction?

A certificate of insurance (COI) is a standardized document issued by an insurance company or broker that serves as evidence that a contractor or subcontractor carries insurance coverage. It doesn’t transfer coverage or modify a policy in any way. It simply confirms that coverage exists as of the date it was issued.

Construction is one of the few industries where COIs flow in every direction across a project. A property owner requires them from the general contractor before starting work. The GC requires them from every subcontractor before they set foot on the job site.

Subcontractors, in turn, require them from their own vendors and material suppliers. Each party in that chain needs documented proof that the others are covered, because if something goes wrong, uninsured parties don’t just expose themselves, they expose everyone above them in the contract hierarchy.

The standard format for a contractor COI is the ACORD 25 form, published by the Association for Cooperative Operations Research and Development (ACORD). Almost every insurer and broker in the United States uses this form. It contains specific fields for coverage types, policy limits, effective dates, and the names of all insured parties. When someone in construction asks you for a COI, they’re asking for a completed ACORD 25 form.

One thing worth clarifying is that a COI is not the same as an insurance policy. The policy is the contract between the insured and the insurer. It runs dozens or hundreds of pages and contains all the specific terms and exclusions that govern coverage. A COI is a one-page summary confirming that coverage is in place. Verifying that the summary is accurate and that the underlying policy actually meets your contractual requirements is a different task altogether.

What Insurance Coverage Does a COI in Construction Typically Document?

Most construction projects require between four and six types of insurance coverage, and a COI must document all of them. The specific types and minimum limits vary by contract, project size, and jurisdiction, but the coverage categories below appear on virtually every commercial construction job in the United States.

Commercial General Liability (CGL)

Commercial general liability insurance is the main coverage on any construction project. It covers third-party bodily injury and property damage claims that arise from a contractor’s operations. If a subcontractor’s work damages an adjacent structure, or if a visitor is injured on the job site, the CGL policy is what responds first.

Most GCs and project owners set minimum CGL requirements at $1 million per occurrence and $2 million in aggregate. Larger commercial and institutional projects routinely require higher limits.

The pressure to carry adequate limits has grown significantly alongside verdict sizes. Average general liability verdicts increased 224% between 2010 and 2019, and nuclear verdicts in liability cases now average $23.8 million. A subcontractor carrying inadequate CGL limits puts every party above them in the contract chain at real financial risk.

Workers’ Compensation and Employer’s Liability

Workers’ compensation is legally required in almost every state for any contractor with employees. Construction is precisely the industry that makes that requirement necessary.

Construction accounts for almost one in five total fatal occupational injuries in the United States, with 1,075 worker deaths recorded in 2023 alone. The total annual cost of construction injuries and fatalities runs approximately $11.5 billion nationally. The average fatality carries an estimated cost of $1.39 million when medical expenses, lost wages, and administrative costs are factored in.

When a subcontractor doesn’t carry workers’ comp, those costs don’t disappear. They shift. Injured workers can pursue claims against the GC or project owner, and courts in many states hold hiring parties liable when they fail to verify coverage before work begins.

Commercial Auto

Commercial auto coverage is required for any subcontractor operating vehicles as part of their scope of work. Personal auto policies exclude vehicles used for business purposes, which means a sub driving an uninsured work truck to your job site creates a coverage gap.

Subs who typically need commercial auto coverage documented on their COI include:

• Concrete and masonry contractor operating mixer trucks or flatbeds
• Electrical and plumbing contractors with service vans
• Equipment rental operators transporting machinery between sites
• Landscaping and site prep contractors using heavy haulers

This coverage type gets overlooked during COI review more than any other, especially for smaller subs. That’s exactly when the oversight tends to matter most.

Umbrella/Excess Liability

Umbrella and excess liability policies layer additional coverage on top of a contractor’s primary CGL, commercial auto, and employer’s liability policies. When a claim exhausts the limits on an underlying policy, the umbrella responds.

On larger projects, GCs and owners routinely require subcontractors to carry $5 million or more in umbrella coverage. A single serious incident can push a claim past primary limits quickly, especially given current verdict trends.

Builder’s Risk Insurance

Builder’s risk insurance covers the structure under construction against physical loss or damage. The table below shows how it differs from CGL coverage, since the two are frequently confused:

The cost of builder’s risk coverage has risen sharply in recent years. Average annual rate increases have exceeded 7% since 2021, driven by catastrophic weather losses that totaled $182.7 billion across 27 US weather events. For GCs and owners building project budgets, that trend makes verifying adequate builder’s risk coverage more consequential than it’s ever been.

Construction-Specific Endorsements You Need to Verify on Every COI

Standard coverage limits are only part of what a COI needs to verify. Endorsements are where most compliance gaps actually hide, and where the difference between being protected and being exposed often comes down to a single missing form number.

An endorsement modifies the terms of an insurance policy. It can expand coverage, restrict it, or add specific parties to the policy. When your contract requires certain endorsements, you need to verify they appear on the policy itself, not just on the certificate. A COI can list language that isn’t actually backed by an endorsement on the underlying policy, and that discrepancy won’t surface until a claim is filed.

These are the four endorsements that matter the most on a construction COI:

Additional Insured — Ongoing Operations

An additional insured endorsement extends coverage under a subcontractor’s CGL policy to another party, typically the GC and the project owner. The ongoing operations version covers claims that arise while the sub is actively working on the project.

The two standard ISO form numbers for this endorsement are CG 20 10 and CG 20 33. When reviewing a sub’s COI, you want to see one of these forms listed in the description of operations or endorsement section. A certificate that simply reads “additional insured as required by contract” without specifying a form number gives you very little to stand on if a claim arises.

Additional Insured — Completed Operations

The completed operations endorsement extends additional insured coverage to claims that come up after the project is finished. Latent defects in construction work can take years to surface. A waterproofing failure, a structural issue, or a faulty electrical installation might not generate a claim until well after the sub has moved on to other projects.

The standard form for this coverage is CG 20 37. Some subcontractors push back on including it because it extends their liability exposure beyond project completion. That’s precisely why you can’t waive it.

Waiver of Subrogation

Subrogation is the legal right that allows an insurance company to pursue a third party after paying a claim on behalf of its insured. In a construction context, if a sub’s insurer pays out a claim for damage that was partially your fault, that insurer can turn around and sue you to recover what it paid.

A waiver of subrogation endorsement surrenders that right. Blanket waivers cover all parties the insured is contractually required to waive subrogation for, which is what you want to see. Scheduled waivers name specific parties, which creates room for gaps if the certificate holder isn’t listed correctly.

Primary and Non-Contributory

When you’re named as an additional insured on a sub’s policy, their coverage should respond first before any of your policies are called upon. Primary and non-contributory language establishes exactly that. The sub’s policy is primary, and your insurer won’t be asked to contribute to the same claim.

Without this endorsement, a sub’s insurer can argue that your policy should share in the loss. That argument has real traction in litigation, and it can leave your limits exposed on a claim that should have been the sub’s insurer’s problem entirely.

This is what to look for when reviewing these four endorsements on a COI:

Vertikal RMS’s own data shows that 7 out of 10 COIs received from vendors are out of compliance in at least one area. Endorsement deficiencies account for a significant share of those failures. They’re also the hardest category to catch without insurance expertise, because the gap between what a certificate says and what a policy actually contains isn’t visible from the document alone.

Notice of Cancellation

Most construction contracts require a subcontractor’s insurer to provide advance written notice if a policy is cancelled or materially changed before its expiration date. The standard requirement is 30 days, though some contracts push that to 45 or 60 days for larger projects.

The practical value of this requirement is straightforward. If a sub’s GL policy lapses mid-project because they missed a premium payment, you need enough lead time to either require them to reinstate coverage or pull them from the job before an uninsured incident occurs.

Where this gets complicated is enforcement. Insurers are not always contractually obligated to provide notice directly to certificate holders, and the standard ACORD 25 form includes language limiting the insurer’s obligation to “endeavor to” provide notice. That qualifier matters. It means the notice may not arrive, and your exposure window opens the moment the policy lapses instead of the moment you find out.

Automated COI tracking addresses this gap more reliably than any paper-based process can. CertFocus by Vertikal RMS monitors policy expiration dates across your entire subcontractor roster and sends automated alerts before coverage lapses.

What Information Appears on a Construction COI?

Every COI in construction follows the standardized ACORD 25 format. The fields below appear on every certificate, and each one requires review before you approve a subcontractor for work.

A completed ACORD 25 includes the following information:

• Named insured: The legal name of the contractor or subcontractor carrying the coverage. This must match exactly the name of your contract with that party. A mismatch between the certificate name and the contracted entity name is more common than you’d expect, and it creates real questions about whether coverage applies.
• Certificate holder: The party requesting proof of insurance, typically the GC or project owner. Verify that this matches your company’s legal name and that the address is current. An incorrectly listed certificate holder can complicate a claim.
• Insurer name and NAIC number: The insurance carrier providing each policy. The NAIC number lets you verify the carrier’s licensing status in your state and look up their AM Best financial strength rating. A financially unstable carrier is a risk factor in its own right.
• Policy types and numbers: Each line of coverage is listed separately with its own policy number. If a required coverage type is missing from the certificate entirely, that’s a deficiency that needs to be resolved before work begins.
• Effective and expiration dates: The active coverage window for each policy. A sub’s GL policy might be current while their workers’ comp is three weeks from expiration. Both need to cover the full duration of their work on your project.
• Coverage limits: Per occurrence and aggregate limits for each policy type. Verify these meet the minimums your contract specifies, because a sub can carry valid coverage that still falls short of your contractual requirements.
• Description of operations: The section where endorsements, additional insured status, waivers of subrogation, and project-specific requirements get documented.

That last field deserves the most scrutiny. The description of operations is where required endorsement language either appears or doesn’t. A certificate that reads “additional insured as required by written contract” without specifying form numbers, or that leaves the waiver of subrogation section blank, tells you very little about what the underlying policy actually contains.

Getting this right has never mattered more from a financial exposure standpoint. Construction companies and engineering firms faced $2 billion in nuclear verdict awards in 2024 alone, placing them among the six most exposed industries in the country. At the same time, purchased casualty liability limits across the industry have dropped roughly 60% over the past decade, even as social inflation hit 7% in 2023, its highest rate in 20 years. The gap between the coverage construction firms are buying and the verdicts they’re facing is widening, and a COI that doesn’t accurately reflect what’s actually in a policy accelerates that exposure.

The regulatory dimension compounds it further. OSHA’s maximum penalty for a willful or repeated construction safety violation reached $165,514 per violation in 2025, with the highest single contractor penalty ever issued exceeding $8 million. Proper insurance compliance documentation isn’t separate from OSHA risk management. It’s part of the same picture.

The deeper issue is that a COI is a summary document prepared by a broker, not a guarantee issued by the insurer. Brokers can make errors. Policies can contain exclusions that contradict what the certificate implies. Reviewing the certificate is the starting point, and confirming the underlying endorsements are actually attached to the policy is the step that most manual COI processes never get to.

The Real Challenge: Tracking COIs Across Dozens of Subcontractors and Multiple Projects

COI compliance is genuinely complex, and the ways a certificate can fall short of what your contract requires are many. Even diligent subcontractors with legitimate coverage get it wrong.

Managing a single COI is straightforward. Managing COIs across dozens of active subcontractors on multiple concurrent projects is a different problem entirely.

Why Manual Tracking Breaks Down

Consider what large-scale COI management actually looks like in practice. A large commercial GC might carry hundreds of subcontractor relationships across active projects at any given time, drawing from a pool of 814,557 employer construction businesses operating in the United States. Each sub carries multiple policies. Each policy type carries its own expiration date.

A single subcontractor’s compliance picture might look like this:

Multiply that across 200 subcontractors and three active projects. Then add endorsement verification on top of it. Catching a missing CG 20 37 or flagging a scheduled waiver of subrogation that doesn’t name the right certificate holder requires actual insurance expertise. A diligent compliance coordinator working a spreadsheet doesn’t have that expertise, and a spreadsheet doesn’t send alerts when a policy lapses at 11:59 PM on a Tuesday.

What a Compliance Gap Actually Costs

The consequences of missing something aren’t administrative. Fifty-eight percent of in-house lawyers at U.S. construction businesses reported spending more than $5 million annually on litigation and arbitration in 2022, with 70% expecting dispute volumes to climb further. A compliance gap discovered after an incident doesn’t generate a correction request. It generates a claim, and potentially a lawsuit.

A lapsed GL policy or a missing additional insured endorsement found after an injury on the job site is a financial exposure. The paperwork problem already passed.

How CertFocus by Vertikal RMS Solves It

CertFocus by Vertikal RMS is the platform construction firms use to manage COI compliance at scale. It works in two layers that manual processes and single-layer automation can’t replicate:

1. Hawk-I AI uses state-of-the-art artificial intelligence technology to process incoming COIs in seconds, automatically verifying coverage types, limits, dates, and endorsement requirements.
2. Credentialed insurance professionals holding CIC, CPCU, CISR, and CRIS designations review the complex requirements that automated systems routinely miss. This includes endorsement form numbers, carrier financial strengths, and policy language discrepancies.

Beyond that two-layer review, the CertFocus by Vertikal RMS gives your team:

• Real-time compliance dashboard organized by project and by subcontractor
• A vendor self-service portal where subs upload certificates directly, removing your team from manual collection and follow-up
• AM Best financial strength verification on every carrier
• Direct integrations with Procore and CMiC, connecting compliance status to the project management systems your team already works in

STO Building Group relies on Vertikal RMS to manage subcontractor compliance across their portfolio. Across all clients, Vertikal RMS maintains compliance rates above 90% and a 99% client retention rate.

COI Tracking and Subcontractor Prequalification: Why They Belong Together

A valid COI tells you a subcontractor was insured at the time the certificate was issued. Prequalification tells you whether you should be working with them at all. Both questions matter, and answering them through separate systems creates gaps that tend to come up at the worst possible moment.

The subcontractor prequalification process happens before a sub is approved for work. It screens for financial stability, safety performance through EMR ratings, past project history, and overall organizational health. A sub who passes prequalification has cleared a substantive threshold. Your team has reviewed their financials, evaluated their safety record, and made a deliberate decision to add them to your approved roster.

COI tracking picks up where prequalification leaves off. Once a sub is approved, their insurance compliance needs to be maintained and monitored for the entire duration of your working relationship. A sub who was financially sound and fully insured at prequalification can fall out of compliance six months later when a policy lapses or an endorsement doesn’t renew correctly.

When prequalification and COI tracking run on separate platforms, that handoff breaks down. There’s no automated alert when a prequalified sub’s insurance status changes. Your compliance team and your prequalification team are working from different data sets with no connection between them.

PreQual by Vertikal RMS and CertFocus by Vertikal RMS operate as an integrated solution. When a subcontractor’s insurance or qualification status changes, the platform triggers automatic alerts and updates their consolidated risk profile across both systems. Your team sees the full picture in one place rather than reconciling data across two.

The integration also addresses a requirement that general contractors working with subcontractor default insurance (SDI) face directly. Many SDI carriers require formal prequalification documentation before extending coverage. PreQual by Vertikal RMS, is accepted and preferred by all subcontractor default insurance carriers. PreQual by Vertikal is built to satisfy those requirements, and its connection to CertFocus by Vertikal RMS means the ongoing insurance compliance that SDI carriers also monitor stays current without manual intervention.