Umbrella Insurance for Contractors in Washington and Idaho

Contractors usually need a commercial umbrella because general contractors and owners require it, completed operations claims can arrive years later, and trucks drive large claims. In Washington, the umbrella must sit over stop-gap, which matters when subcontracts include negotiated waivers of workers comp immunity. Check that the umbrella covers the work you actually do, including residential and height work.

By Trella Commercial · Updated October 5, 2026

The short version

Contracts drive the limit: general contractors and owners commonly require umbrella limits scaled to the project, with additional insured status for ongoing and completed operations.
Completed operations matter: claims from finished work can come years later, so the umbrella must sit over products-completed operations coverage.
Trucks and equipment: Washington and Idaho auto minimums are $25,000 per person; contractors' trucks and trailers need far more.
Washington stop-gap: subcontracts can include negotiated waivers of workers comp immunity under RCW 4.24.115, making an employee injury a claim against you. Stop-gap and the umbrella must be ready for it.
Exclusions to check: residential and condo work, work above a certain height, and specific trades can be excluded or limited.

What contractors are usually asked for

Requirement	Typical ask
Umbrella limit	Scaled to the project, from $1 million on small jobs to $5 million or more on larger commercial work
Additional insured on the umbrella	For the owner and general contractor, ongoing and completed operations
Primary and noncontributory	Your coverage pays first
Waiver of subrogation	On general liability, auto, workers comp or stop-gap, and the umbrella
Completed operations duration	Coverage for a set number of years after the project

See contracts that require an umbrella for how to meet each term.

Washington specifics for contractors

Topic	Rule
Registration insurance	General liability of at least $250,000 combined single limit to register with L&I; contracts require far more (see general contractors)
Employee injury suits	Generally barred, but subcontracts can waive immunity if the waiver is specific, express, and mutually negotiated (RCW 4.24.115)
Sole negligence indemnity	Void in construction contracts (RCW 4.24.115)
Stop-gap	Needed under the umbrella; see the Washington stop-gap gap

In Idaho, employers liability is part of the workers comp policy, and contractor registration requires $300,000 of general liability including completed operations.

Exclusions and limits to check

Issue	Why it matters
Residential, condo, or tract housing work	Some contractor umbrellas exclude or limit it
Height limits	Roofing and work above a certain number of stories can be excluded
Specific trades	Demolition, crane work, or EIFS can be excluded
Classification	Work outside the operations described on the underlying policies may not be covered
Subcontractor requirements	Some policies require you to collect certificates from subs
Wrap-ups	Projects under an owner or contractor controlled insurance program may have their own umbrella

Common questions

Do contractors need umbrella insurance?

Most do. General contractors and owners commonly require it, completed operations claims can arise years after a job, and trucks and equipment create large liability exposure.

How much umbrella do general contractors require from subcontractors?

It varies by project, from $1 million on smaller jobs to $5 million or more on larger commercial work, usually with additional insured status for ongoing and completed operations.

Does my umbrella cover completed operations?

It should, as long as the underlying general liability includes products-completed operations and the umbrella sits above it. Check the completed operations aggregate on the underlying policy.

Why do Washington contractors need stop-gap under their umbrella?

Because subcontracts can include negotiated waivers of workers comp immunity, which can turn an employee's injury into a liability claim against you. Most umbrellas also require employers liability underneath.

Are residential contractors covered by commercial umbrellas?

Often, but some umbrellas exclude or limit residential, condo, or tract housing work. Disclose the work you do and confirm it is covered.

Sources

This page is general information. Coverage depends on the policies actually issued. Reviewed October 2026.

More in this guide

Commercial Umbrella and Excess Insurance for Washington and Idaho Businesses
The complete guide this page is part of.
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How Much Commercial Umbrella Coverage Does a Business Need?
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Washington Stop-Gap and Your Umbrella: The Employers Liability Gap
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Commercial Auto and Your Umbrella: Minimums, Fleets, and Employees' Cars
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Contracts That Require an Umbrella: What the Clause Means and How to Meet It
How to read umbrella and excess requirements in general contractor subcontracts, property management agreements, leases, and client contracts: limits, additional insured, primary and noncontributory, follow form, waiver of subrogation, and Washington indemnity rules.
Umbrella Insurance for Rental Property Owners and LLCs
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Personal vs Commercial Umbrella: Why Business Owners Need Both, Coordinated
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