Certificate of Insurance for Excavation Contractors: What GCs Actually Require
A certificate of insurance for excavation contractors is an ACORD 25 document that proves your active coverage to a general contractor or project owner before work begins. For excavation subcontractors, the COI carries requirements that don't apply to most other trades: GCs and municipalities frequently demand higher limits, specific endorsements for underground work, and additional insured status through a formal policy endorsement — not just a name on a form.
What Is a Certificate of Insurance for Excavation Contractors?
The ACORD 25 form is the industry-standard certificate of insurance. It provides a one-page summary of your coverage across multiple policy lines, typically showing general liability, workers compensation, commercial auto, and umbrella coverage in separate sections. Each section lists the carrier, policy number, policy dates, and applicable limits.
For excavation subcontractors, certificates are requested by general contractors, property owners, municipalities, and DOT project managers. The frequency of COI requests is higher in excavation than in many other trades because excavation carries elevated liability exposure: underground utility damage, surface collapse, and environmental disturbance are loss categories that project owners specifically want documented before work begins.
The certificate itself does not modify your policy and does not grant coverage. It is a snapshot of coverage that already exists. If a project requires coverage that isn't in your current policy — XCU removal, higher limits, a specific endorsement — the COI cannot reflect it until the policy is modified first.
What Must Appear on an Excavation COI
Beyond the standard ACORD 25 fields, excavation subcontractors should verify the following before submitting a certificate:
- GL limits match or exceed what the subcontract specifies. Most commercial projects require $1M/$2M minimum. Municipal and DOT work commonly requires $2M/$4M. Check the subcontract language precisely.
- Workers compensation policy is current and active. The certificate must show a policy in force covering the project duration. A gap in workers comp coverage creates a rejection.
- Commercial auto is listed if vehicles will be on-site. Dump trucks, equipment haulers, and service vehicles operating on or traveling to the project site require commercial auto coverage.
- The description of operations section reflects required language. GCs sometimes require specific wording such as project address, contract number, or confirmation that XCU coverage applies.
- Certificate holder matches the requesting party's legal name exactly. A mismatch between the GC's legal entity name and what appears on the certificate can cause a rejection.
Additional Insured Requirements for Excavation Subcontractors
The additional insured requirement is where most COI problems originate. When a GC requires your GL policy to name them as an additional insured, they are asking for coverage rights under your policy — not just a copy of your certificate. This protection must come from a formal endorsement attached to your GL policy.
ISO endorsement CG 20 10 covers ongoing operations while work is in progress. CG 20 37 covers completed operations claims that arise after the job is done. Many excavation subcontracts require both, meaning your additional insured obligation extends beyond project completion.
A subcontractor submits a COI naming the GC as certificate holder only. The excavator strikes an unmarked utility lateral, causing building damage. The property owner sues the GC, who tenders the claim to the sub's GL carrier. The carrier denies coverage because the GC was never added as an additional insured via endorsement. The GC pursues the subcontractor directly. The fix is simple: before any project requiring additional insured status, confirm with your agent that the endorsement is attached to the policy — not just reflected on the certificate.
Minimum Limit Requirements by Project Type
| Project Type | Typical GL Minimum | Additional Endorsements Often Required |
|---|---|---|
| Residential subdivision grading | $1M / $2M | CG 20 10, waiver of subrogation |
| Commercial site prep | $1M / $2M | CG 20 10, CG 20 37 |
| Municipal utility trenching | $2M / $4M | CG 20 10, CG 20 37, umbrella to $5M |
| DOT right-of-way work | $2M / $4M | State DOT endorsements, umbrella to $5M–$10M |
| Underground pipeline or conduit installation | $2M / $4M | XCU coverage confirmed, umbrella to $5M |
These are typical market expectations, not legal minimums. The subcontract agreement is the controlling document. Read the insurance exhibit carefully before signing.
Underground Utility Work and Special COI Requirements
Projects involving underground utility installation, crossing, or repair introduce an additional COI consideration. Some GCs and municipal project owners specifically require confirmation that underground property damage is not excluded from your GL policy. If your policy contains the standard XCU exclusion, your GL carrier may deny a claim involving a utility strike. A GC who requires XCU coverage may reject a COI from a contractor whose policy still contains the exclusion, even if the certificate does not explicitly flag it. Resolve the XCU question at the policy level before bidding utility-adjacent work. See our excavation coverage guide for more on how the XCU exclusion works and how to remove it.
How to Request Your Certificate of Insurance
- Gather project details. Collect the requesting party's full legal name, address, and any specific certificate language required by the subcontract.
- Contact your agent. Call or email with the project details and specify whether additional insured endorsements are required and under which ISO form.
- Confirm endorsements before the certificate is issued. If the project requires CG 20 10 or CG 20 37, the endorsement must be added to the policy before the certificate reflects it accurately.
- Review the certificate before forwarding. Verify coverage types, policy limits, dates, and the certificate holder's exact legal name.
- Keep a copy. Retain the certificate and all endorsements in your project files. If a dispute arises about coverage, this documentation matters.
The Allen Thomas Group issues certificates of insurance for excavation contractors same-day during business hours. As an independent agency working with multiple A-rated carriers across 27 states, we can also evaluate whether your current policy meets the requirements of a specific subcontract before you submit the COI — and adjust coverage if needed. Call (440) 826-3676 or request a free quote online. For broader coverage information, see our excavation contractor insurance overview.
Related Excavation Insurance Guides
Frequently Asked Questions: Excavation Contractor Certificates of Insurance
What is a certificate of insurance for excavation contractors?
A certificate of insurance (COI) is a standardized document — usually the ACORD 25 form — that summarizes an excavation contractor's active insurance policies, coverage types, policy limits, and effective dates. General contractors and project owners require it before allowing a subcontractor to begin work. It proves the contractor carries the minimum coverage required by the subcontract agreement.
What GL limits do GCs typically require from excavation subs?
Most commercial GCs require excavation subcontractors to carry at least $1 million per occurrence and $2 million aggregate in general liability. Municipal and DOT projects typically require $2 million per occurrence and $4 million aggregate. Projects involving underground utility work frequently specify additional endorsements and may require a separate umbrella policy bringing total coverage to $5 million or more.
What is an additional insured endorsement and do excavation subs need one?
An additional insured endorsement adds another party to your GL policy so they receive coverage protection if a claim arises from your work. Most GCs require excavation subcontractors to name them as additional insureds using ISO form CG 20 10 (ongoing operations) or CG 20 37 (completed operations), or both. Being listed on the certificate of insurance alone is not the same as having an additional insured endorsement — the endorsement is a separate policy modification.
Can my COI show XCU coverage?
Yes, but only if your GL policy has the XCU exclusion removed or modified. The description of operations section of the ACORD 25 form can note that XCU coverage is included. For excavation subcontractors working near underground utilities, some GCs and municipalities specifically require confirmation that underground damage is not excluded. If your policy has the standard XCU exclusion intact, the COI cannot truthfully represent underground damage coverage.
How fast can I get a certificate of insurance?
An independent insurance agent can typically issue a certificate of insurance same-day for existing policyholders. The COI is generated from your current active policy and does not require a new policy application. The Allen Thomas Group issues COIs for excavation contractors in its 27-state coverage area same-day upon request during business hours.
Does a COI prove I have workers compensation?
A COI documents your workers compensation policy alongside your other coverage types. The COI must show a current active workers comp policy with policy dates that cover the duration of the project. If you are a sole proprietor who has waived workers comp where permitted, some GCs will require a signed waiver document in addition to the COI.
What is the difference between a certificate holder and an additional insured?
A certificate holder is simply a party that receives a copy of the COI for informational purposes. An additional insured has actual coverage rights under your policy and can make a claim against it. Most subcontracts require the GC to be named as both certificate holder and additional insured, but contractors sometimes submit a COI with only certificate holder status — which does not satisfy the additional insured requirement.
Same-Day COI Issuance for Excavation Contractors — 27 States
The Allen Thomas Group issues certificates of insurance same-day during business hours. We review subcontract requirements before issuing — so your COI reflects the correct limits, endorsements, and language the first time.