General Liability (CGL) is the foundational insurance policy for every fiber, cable, low voltage, and telecom contractor. It’s the coverage every ISP prime, carrier, and hyperscaler GC verifies first on your COI — and it’s the coverage most often mis-written for our trade. This guide covers what GL actually covers vs what it excludes, the ISO endorsement forms primes require, the exclusions that quietly destroy your coverage (pollution, XCU, underground utility), and the exact limits Zayo, Crown Castle, hyperscaler GCs, and BEAD-funded primes require in 2026.
What General Liability Actually Covers
The Commercial General Liability (CGL) policy is a standardized ISO product. Every U.S. carrier that writes CGL uses substantially the same base form (currently CG 00 01), so the coverage structure is consistent across carriers. The policy contains three Coverage Parts:
The core coverage. Third-party bodily injury (someone hurt by your operations) and third-party property damage (something you damaged that isn’t yours). This is where a customer’s drywall or a neighbor’s fence gets paid from.
Libel, slander, false arrest, wrongful eviction, copyright infringement in advertising. Rarely triggers for fiber contractors but included in the standard CGL policy.
Small (typically $5K-$15K per person) medical payment coverage for minor third-party injuries on your job site, regardless of fault. Prevents small injury claims from becoming litigation.
Claims arising after your work is completed — a splice that fails a year later and causes downstream damage. Separately-limited aggregate. Critical for fiber contractors because the “defect discovery” window is often months or years after mobilization.
What GL Doesn’t Cover (And What You Need Instead)
GL has significant exclusions. Understanding these prevents the disaster of discovering — at claim time — that you needed a different policy:
| Not Covered by GL | What You Need Instead |
|---|---|
| Injuries to your own employees | Workers’ Compensation |
| Damage from vehicles you own or operate | Commercial Auto |
| Pollution events (gas strikes, frac-outs, sewer breaches) | Contractor’s Pollution Liability |
| Damage to work you performed (“your work” exclusion) | Not typically insurable — warranty is your protection |
| Cyber breach or data compromise from network access | Cyber Liability |
| Errors in design, testing, or certification (professional errors) | Professional Liability (E&O) |
| Your tools, splicers, and OTDR gear | Inland Marine / Contractors Equipment |
| Employment disputes with your employees | Employment Practices Liability (EPLI) |
The two coverage assumptions that most often bankrupt fiber contractors: (1) “My GL will cover it if my drill hits a gas line” — it won’t; you need CPL; and (2) “My GL will pay to redo my defective splice” — it won’t; the “your work” exclusion applies.
Standard GL Limits & What Different Primes Require
CGL limits are structured across four measurements. Understanding each matters because primes specify different combinations:
- Per Occurrence — maximum paid on any single claim event. Standard: $1M or $2M.
- General Aggregate — annual cap across all claims combined. Standard: $2M or $4M.
- Products/Completed Operations Aggregate — separate annual cap for completed-work claims. Standard: $2M or $4M.
- Personal & Advertising Injury — typically matches per occurrence limit.
| Prime / Scope | Minimum GL Required |
|---|---|
| ISP residential FTTH drop install | $1M / $2M / $2M |
| OSP fiber construction (aerial & underground) | $2M / $4M / $4M (per-project aggregate strongly preferred) |
| Zayo subcontract work | $1M each occurrence / $2M general aggregate / $2M products-completed — per Zayo Avetta requirements |
| Crown Castle (now Zayo) legacy scope | $1M / $2M / $2M with Waiver of Subrogation |
| Hyperscaler data center GC (DPR, Turner, Skanska) | $2M / $4M or $5M aggregate; some campuses require $5M/$10M |
| BEAD-funded fiber projects | $1M-$2M / $2M-$4M; specific to grant terms |
| City of Phoenix ROW work | $1M / $2M with pollution and underground coverage |
The ISO Endorsements Every Fiber Contractor Needs on Their GL
The base CGL policy is only half the picture. Primes verify the presence of specific ISO endorsement forms on your COI. Missing endorsements are the #1 reason COIs get rejected at prequalification. The essential endorsements:
| Endorsement | Form Number | What It Does |
|---|---|---|
| Additional Insured — Ongoing Operations | CG 20 10 | Names the prime as AI for claims arising from your ongoing work |
| Additional Insured — Completed Operations | CG 20 37 | Extends AI status to claims after work is completed |
| Waiver of Subrogation | CG 24 04 | Your carrier waives right to subrogate against the prime |
| Primary and Noncontributory | CG 20 01 | Your policy pays first, without contribution from prime’s policy |
| Per-Project Aggregate | CG 25 03 | Each project gets a separate aggregate limit |
| Contractual Liability (usually included in base) | N/A | Covers liability assumed under written contracts |
For the full walkthrough of what each endorsement does and what to put in your COI description box, see our 7 COI Endorsements Guide.
GL Exclusions That Quietly Destroy Your Coverage
Carriers sometimes attach exclusions that gut coverage for the specific work fiber contractors do. Watch for these on the endorsement schedule:
Standard on virtually every CGL policy. Excludes any pollution event — gas strikes, frac-outs, sewer breaches, fuel spills. This is why Contractor’s Pollution Liability is a separate policy.
Excludes Explosion, Collapse, and Underground damage. Fatal for OSP contractors doing directional drilling or trenching. If your policy carries this endorsement, you cannot bid any work near buried infrastructure. Get it removed or switch carriers.
Some carriers add a specific underground utility damage exclusion. Similar effect to XCU. Any fiber contractor doing OSP work must verify this exclusion is NOT on the policy.
Excludes damage from ground subsidence or earth movement. Can affect trenching, bore, and heavy-equipment operations.
Reinforces the employee-injury exclusion. Not a problem if you have workers’ comp. Becomes a problem if you use uninsured 1099 labor and one of them is injured.
The declarations page shows limits and forms attached, but the exclusions are often in a lengthy endorsement schedule you have to specifically request. Get the full schedule from your broker at binding and re-verify at every renewal. Carriers add exclusions at renewal without highlighting them.
Real Prime Requirements — What Zayo, Crown Castle, Hyperscalers & Carriers Ask For
Below is a scope-based summary of what real primes require on your GL COI as of 2026. Use this as your prequalification baseline.
| Prime / Portal | GL Limits | Endorsements Required |
|---|---|---|
| Zayo (Avetta) | $1M/$2M/$2M | CG 20 10, CG 20 37, CG 24 04, CG 20 01, Zayo Group LLC as AI |
| Crown Castle (Avetta) — now Zayo | $1M/$2M/$2M | Same as Zayo post-acquisition |
| AT&T Fiber sub | $2M/$4M | AT&T Services Inc. as AI, primary & noncontributory |
| Verizon / Frontier sub | $1M/$2M or higher | Verizon Communications and affiliates as AI |
| Comcast Business / Spectrum Business / Cox Business | $1M/$2M | Individual carrier entity as AI + waiver |
| Hyperscaler data center GC | $2M/$4M or $5M aggregate | GC + owner + hyperscaler entity as AI, all four endorsements, per-project aggregate |
| BEAD-funded prime | $1M-$2M / $2M-$4M | Grantee-specific; Davis-Bacon adjacent |
| City of Phoenix ROW | $1M/$2M + $1M pollution | City of Phoenix as AI, contractor’s pollution required |
What GL Actually Costs for a Fiber Contractor
There’s no published rate for fiber contractor GL because carriers underwrite each account individually. But typical premium ranges for a $1M/$2M/$2M policy:
| Operation Profile | Typical Annual GL Premium |
|---|---|
| Solo splicer / drop tech, revenue under $250K | $1,500 – $3,000 |
| 2-5 employee fiber crew, primarily aerial | $2,500 – $5,500 |
| 5-10 employee crew with underground scope | $4,000 – $9,000 |
| 10+ employee OSP contractor with directional drilling | $8,000 – $18,000 |
| Multi-state OSP contractor with $5M+ revenue | $15,000 – $40,000+ |
| Data center / hyperscaler scope with $2M/$4M limits | Add 15-30% to any of above |
Premium drivers: revenue, payroll, employee count, work mix (aerial vs underground vs splicing), states of operation, class codes, prior claims (open or closed), and specific policy endorsements. Get an accurate quote by submitting revenue and scope information — ballpark numbers online are inevitably wrong.
Get a GL Quote Built for Your Scope
$1M/$2M or $2M/$4M limits, all required endorsements (CG 20 10, CG 20 37, CG 24 04, CG 20 01), pollution and XCU verified NOT excluded, and same-day COI for active bids.
Request a GL QuoteFrequently Asked Questions
Third-party bodily injury, third-party property damage, personal and advertising injury, and products/completed operations claims arising from your operations. GL does NOT cover pollution, damage to your own work, employee injuries (workers’ comp), owned vehicle damage (auto), or cyber breach.
$1M/$2M/$2M is the market baseline for ISP subcontract work. Carrier primes and hyperscaler GCs increasingly require $2M/$4M. Add a $5M+ umbrella for larger contracts.
CG 20 10 (AI Ongoing), CG 20 37 (AI Completed Ops), CG 24 04 (Waiver of Subrogation), CG 20 01 (Primary & Noncontributory), CG 25 03 (Per-Project Aggregate). See our full COI endorsements guide.
No. The “your work” exclusion excludes damage to work you performed. If your splice fails and needs to be redone, GL does not cover the redo cost. It responds to third-party claims arising from your work, not repair of the work itself.
Typical range is $1,500 to $18,000+ per year depending on operation size and scope mix. Submit a quote for pricing specific to your revenue, payroll, and work profile.
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Fiber contractor GL with all required endorsements, appropriate limits, and no fatal exclusions. Fast COI turnaround.
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