Which insurance problem is specific to each trade on a data-center job?
By the Rayon research desk · Last reviewed
Each trade’s largest exposure sits in a different policy. Electrical and structural trades are driven by workers compensation. Mechanical trades meet pollution and delegated design. Commissioning and controls meet the limits of general liability, which needs injury or physical damage. Fire protection is a completed-operations problem, fiber is a care-and-custody problem, and site work is an equipment and pollution problem.
Where does each trade’s problem sit?
The table reads the same eight trades across a data-center campus. The right-hand column is where to look on your own policy. It names forms, not what any particular policy will pay.
| Trade | Where on the site | The problem | Where to look |
|---|---|---|---|
| Electrical | Substation, switchgear, generators | Workers compensation is the largest line, and the experience mod prices it and decides prequalification. Switchgear and generators are yours to insure until installed and accepted, unless the project’s builder’s risk says otherwise | WC 00 00 00 C · installation floater · CG 20 10 and CG 20 37 |
| Mechanical and cooling | Chiller yard, cooling loops | Refrigerant, glycol and fuel fall under the pollution exclusion. If you size or select equipment you carry delegated design | Exclusion f of CG 00 01 · contractors pollution · contractors professional |
| Commissioning | Inside the data hall | The product is advice and test results. General liability needs bodily injury or property damage before it responds | Contractors professional · CG 40 47 if test scripts come from AI tools |
| Fiber and low-voltage | Duct bank to the meet-me room | Work in a live hall puts the owner’s equipment in your care. Damage to it, and loss of data with no damage, are excluded | Exclusions j(4), j(5) and p of CG 00 01 · contractors equipment for test gear |
| Controls and automation | Building management room | You connect to the owner’s network. A wrong setpoint is argued as a professional and a cyber claim first | CG 21 06 or CG 21 07 · technology errors and omissions · cyber |
| Fire protection | Pump house, pre-action and clean-agent systems | A system that fails or discharges after hand-over is a completed-operations claim. Shop drawings and hydraulic calculations are design | CG 20 37 · the wrap-up’s completed-work period · CG 22 79 or CG 22 80 |
| Steel, concrete and envelope | Frame and shell | Work at height drives workers compensation. Defects in the frame surface late, where the “your work” exclusion decides what is paid | WC 00 00 00 C · exclusion l of CG 00 01 · CG 22 94 |
| Site and civil | Earthwork, utilities, laydown | Owned and rented machines need their own cover. Disturbed soil, stormwater and buried utilities are pollution and property-damage exposures | Contractors equipment · contractors pollution · CA 00 01 |
Why doesn’t general liability cover advice, tests and data?
The general liability form pays for bodily injury and property damage caused by an occurrence. A commissioning report that passes a system that should have failed, or a control sequence that is wrong, may cause a large loss with no physical damage at all. That loss belongs to a professional liability policy.
Two endorsements narrow it further. The limited professional exclusion CG 22 80 removes engineering, architectural and surveying services you provide in that capacity, although it does not apply to your operations in connection with construction work you perform. The data endorsement CG 21 06 replaces exclusion p and removes damages arising out of the loss of, loss of use of, damage to or inability to access electronic data.
Which trades are most exposed after the job ends?
Fire protection, structural and mechanical trades, because their defects appear after hand-over. Additional insured status under CG 20 10 stops when the work is completed or put to its intended use. CG 20 37 carries it into completed operations.
On a wrapped project, the wrap-up’s completed-operations cover runs for a stated period. Your own policy’s wrap-up exclusion, CG 21 54, applies whether or not the wrap-up remains in effect, so a claim that arrives after that period can find no policy at all.
Sources
- ISO CG 00 01 04 13, Commercial General Liability Coverage Form
- ISO CG 20 10 04 13, Additional Insured: Owners, Lessees or Contractors, Scheduled Person or Organization
- ISO CG 20 37 04 13, Additional Insured: Owners, Lessees or Contractors, Completed Operations
- ISO CG 21 54 01 96, Exclusion: Designated Operations Covered by a Consolidated (Wrap-Up) Insurance Program
- ISO CG 40 47 01 26, Exclusion: Generative Artificial Intelligence
- NCCI WC 00 00 00 C, Workers Compensation and Employers Liability Insurance Policy
- NCCI, ABCs of Experience Rating
- ISO CG 21 06 05 14, Exclusion: Access or Disclosure of Confidential or Personal Information and Data-Related Liability, With Limited Bodily Injury Exception
- ISO CG 22 80 04 13, Limited Exclusion: Contractors, Professional Liability
- ISO CG 22 79 and CG 22 94 (named for reference; text not linked)
- AGC, Insurance Issues in Constructing Data Centers: A GC’s Perspective (2026)
General information, not legal advice or an interpretation of your policy. Policy forms and endorsements control. Form numbers are © Insurance Services Office, Inc. and are cited for reference.