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Washington Subcontractor Insurance Requirements: What GCs Must Require from Subs
Coverage requirements for subcontractors on Washington job sites — including how Washington's state-run workers' comp system changes what you'll see on a COI and how you verify coverage.
In this guide
Standard Insurance Requirements for Washington Subcontractors
Washington GCs typically require four core coverages from every subcontractor. These are contractual requirements — Washington sets a very low statutory minimum for contractor registration ($6,000 in property damage coverage), which is far below what commercial practice demands.
| Coverage type | Typical minimum | What it covers |
|---|---|---|
| Commercial General Liability (CGL) | $1M per occurrence $2M aggregate | Bodily injury and property damage from the sub's operations and completed work |
| Workers' Compensation | State fund (L&I) — not a private policy | Medical expenses and lost wages for the sub's employees (see below) |
| Commercial Auto Liability | $1M combined single limit | Bodily injury and property damage from vehicles used in the sub's operations |
| Umbrella / Excess Liability | $1M–$5M (project dependent) | Excess coverage above CGL, auto, and employer's liability limits |
Workers' Compensation — Washington's State Fund System
Washington operates a state-administered workers' compensation system through the Department of Labor & Industries (L&I). Unlike most states where WC is a private insurance market, Washington WC is paid into the state fund — and this changes how you verify it.
What this means for COI review
A Washington sub's COI will not list a private WC carrier, because there isn't one for most subs. Don't flag a COI as incomplete just because it lacks a WC carrier name. Instead, verify WC coverage through L&I directly.
Owner-operators and sole proprietors
Sole proprietors in Washington can elect to waive WC coverage for themselves, but must cover any employees. If a sub is a sole proprietor claiming no employees, confirm this in writing — if they bring a crew on site, WC coverage is required for those workers and the liability for non-compliance can flow to you as the GC.
What to require in your subcontract
- Require the sub's L&I Unified Business Identifier (UBI) and contractor registration number in the subcontract
- Verify active L&I registration before work starts, not just at contract signing
- Require notification if L&I registration status changes during the project
- For sole proprietor subs with no employees: get a written statement confirming they will not bring any employees on site without first notifying you
Additional Insured and Waiver of Subrogation
Two provisions belong in every Washington subcontract and should appear on the COI:
Additional insured endorsement
Require that your company (and the project owner, if applicable) be listed as an additional insured on the sub's CGL and commercial auto policies. Specify primary and non-contributory status — this means the sub's policy responds first before your own coverage is triggered.
Waiver of subrogation
Require a waiver of subrogation on the sub's CGL in your favor. Since WC is through L&I (a state fund), subrogation waiver on the WC side works differently — but it's still worth including in your contract language for the CGL policy.
Adjusting Minimums by Project Type
The standard minimums above work for typical commercial and residential projects. Scale up for larger or higher-risk work:
| Project type | Suggested CGL minimum | Suggested umbrella |
|---|---|---|
| Residential remodel / small commercial | $1M / $2M | Not always required |
| Mid-size commercial ($1M–$10M project value) | $1M / $2M | $1M–$2M |
| Large commercial / industrial ($10M+) | $2M / $4M | $5M+ |
| High-hazard trades (demo, roofing, structural) | $2M / $4M | $5M+ |
Your prime contract with the owner sets the floor — whatever they require of you flows to your subs. Read it carefully before drafting subcontract insurance requirements.
Collecting and Tracking Certificates of Insurance
In Washington, COI tracking requires a parallel step that most states don't need: L&I registration verification. Build both into your onboarding process.
- Collect a COI before work begins — verify GL, auto, and umbrella coverage and additional insured endorsement
- Separately look up the sub's L&I registration at verify.lni.wa.gov to confirm active WC coverage
- Track COI expiration dates and set reminders 30+ days ahead to request renewals
- Re-verify L&I registration at least annually or at the start of each new project
FAQ
Is workers' compensation required for subcontractors in Washington state?
Yes. Washington requires workers' compensation coverage for all employees, with no opt-out for most private employers. Coverage is provided through Washington's state fund (L&I) — not through private insurers. Verify coverage through L&I registration, not through the COI.
What is the minimum general liability insurance for a subcontractor in Washington?
Washington contractor registration requires a minimum of $6,000 in property damage coverage — far below commercial practice. GCs typically require $1M per occurrence / $2M aggregate as a contractual standard.
How do I verify a Washington sub's workers' comp coverage?
Look up the sub's L&I registration at verify.lni.wa.gov. An active registration confirms WC coverage is current. The COI will not show a private WC carrier.
Do I need to be listed as additional insured on my sub's policy in Washington?
Yes, for general liability and commercial auto. Specify primary and non-contributory status. Washington's state WC system means additional insured status doesn't apply to the WC policy.
What does a Washington contractor's COI actually show?
General liability, commercial auto, and any umbrella coverage through private insurers. It will not show workers' compensation through L&I. Verify WC separately through L&I registration lookup.
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