Is Construction Arbitrage Legal in Washington State?

Yes. Construction arbitrage is legal in Washington State. Acting as the prime contractor, winning the work, subcontracting it to registered trades, and keeping the spread between those two numbers is standard commercial practice here. The compliance requirement is registration with the Department of Labor and Industries (L&I) under RCW 18.27 - a surety bond, liability insurance, a UBI from the Department of Revenue, and a $150.20 registration fee. No exam required. No trade qualification. Get the registration right and the model works.

Washington is a large, active construction market - Seattle, Tacoma, Bellevue, Spokane, and a band of fast-growing suburban corridors in between. I looked at the compliance picture carefully because there is one point that catches people: Washington requires both you and every subcontractor you use to hold an active, independent registration. That is a harder line than most US states draw, and it matters for how you build your sub database.

Is construction arbitrage legal in Washington State - the direct answer#

Construction arbitrage means you are the main contractor: you sign the prime contract with the client, you manage and pay subcontractors to do the physical work, and the margin between those two numbers is your income. Some call it contractor arbitrage or construction dropservicing - same model, different label.

Washington has no statute requiring a prime contractor to self-perform any part of the job. The model is legal. Subcontracting is how most of Washington's construction industry has always operated. What the state requires is that whoever holds the prime contract is registered, bonded, and insured under RCW 18.27 - and that every subcontractor doing the physical work meets the same standard independently.

The primary regulator is L&I - Washington Department of Labor and Industries. There is no state general contractor examination. Washington took the registration route, not a competency-licence route.

What registration with L&I actually requires#

Under RCW 18.27.040, every contractor must meet four requirements before registering with L&I:

Register your business entity first. You need a UBI (Unified Business Identifier) from the Washington Department of Revenue. This is your state business registration, and it must be active before you can apply for contractor registration. Your exact business name on the UBI must match exactly what appears on your bond and insurance - any mismatch stalls the application.

Surety bond. $30,000 if you are registering as a general contractor; $15,000 if you are registering as a specialty contractor. The bond must come from a surety insurer licensed in Washington. General contractors can hire subcontractors across multiple specialties; specialty contractors are limited to the specialty they register under.

Liability insurance. Washington sets the minimum at:

• $50,000 for injury or damage to property
• $100,000 for injury or damage, including death, to any one person
• $200,000 for injury or damage, including death, to more than one person

L&I must be named as certificate holder on your policy. That minimum is the floor, not a target. Any commercial client worth taking on will ask for $1 million or more. Budget for $1 million minimum general liability before you start quoting real work.

Registration fee: $150.20. The same fee applies to initial registration and renewal. You can register and renew online through the L&I contractor registration portal.

That is the complete list - no exam, no minimum experience, no qualifying party system. If the bond and insurance are in place and your business is registered with the Department of Revenue, you can register. The L&I Steps for Success guide (F625-115-000) walks through the application sequence step by step.

Both you and your subs must be registered independently#

This is the single most important compliance point for running construction arbitrage in Washington, and it is what most guides skip. Every subcontractor working on your jobs must hold their own active L&I contractor registration. You cannot register once and cover your subs under your number.

Before you assign any work to a sub in Washington, run their name or business through L&I's verify tool. It takes sixty seconds. An unregistered sub on your site is your liability - building permit applications require the prime to certify that subs are registered, and L&I runs enforcement checks.

Make this part of sub onboarding: registration number goes into your database on first contact, live verification happens before every new job. A sub whose registration has lapsed is as risky as one who never registered - unless the lapse is 30 days or fewer and they maintained their bond and insurance throughout (Washington allows a narrow grace window but that is not a policy to lean on).

The 7-part independent contractor test#

Washington applies a 7-part independent contractor test to construction workers - one part stricter than the 6-part test for non-construction industries - and it is among the toughest such tests in the US. If a worker fails this test, they are classified as your employee for workers' compensation purposes, which means you owe L&I premiums on their wages.

All seven elements must be satisfied:

1. Free from your control or direction in performing the work
2. Performing services outside your usual course of business
3. Not maintaining a permanent space at your place of business
4. Responsible for the cost of their own principal place of business
5. Customarily engaged in an independently established trade or business of the same nature as the contracted work
6. Responsible for obtaining their own business registrations, permits, or licences
7. Operating under a contract that specifies they are responsible for their own workers' compensation coverage

L&I also applies a "personal labor test" as a first filter: a worker who brings their own employees to do the job, or brings heavy specialised equipment with the expertise to operate it, passes automatically. Most trade subs on typical jobs will not meet that narrow test, so the 7-part check applies.

What this means in practice: work with subs who run real independent operations. Their own registration, their own equipment, their own client list beyond you, their own workers' comp account with L&I. A 1099 or a registration number alone does not satisfy the test - L&I looks at the substance of the relationship. Workers who only take your calls, only go where you send them, and have no other clients look like your employees regardless of how you label them.

This is not unique to Washington, but Washington enforces it more systematically than most states. Get your sub agreements right from the start. The structure of those agreements is covered in what contracts you need for construction arbitrage.

Specialty trades require separate licensing#

Electrical and plumbing work sit in a separate licensing layer above the general contractor registration. Your subs carrying out these trades must hold their own specific credentials in addition to contractor registration.

Plumbing. All plumbing contract work in Washington must be performed by a Licensed Plumbing Contractor under RCW 18.106. General contractor registration does not cover plumbing contracting.

Electrical. Electrical contractors and the electricians they employ are separately licensed by L&I under the electrical licensing programme. HVAC/refrigeration electrical work (06A specialty) requires 4,000 hours of experience plus separate certification before a worker can carry it out.

These credentials sit with your subcontractors, not with you as the main contractor. Before you assign electrical or plumbing work, verify both the sub's contractor registration and their trade licence. Both pieces need to be active and in scope for the work you are assigning.

The penalties for getting this wrong#

Unregistered contracting is a gross misdemeanor under RCW 18.27.020. A first conviction can bring fines up to $5,000 and up to 364 days in jail. Repeat offences escalate. The criminal route is not the only risk - L&I can assess civil penalties up to $1,000 per day of unregistered operation under RCW 18.27.340.

The trigger is wide: advertising, submitting a bid, or performing any construction work without an active registration all constitute an offence. You do not need to have completed a job to be penalised - a proposal with your unregistered name on it is enough.

What a clean Washington State setup looks like#

Running construction arbitrage properly in Washington means:

• L&I contractor registration active, with a $30,000 surety bond and at least $1 million liability insurance in practice
• A UBI from the Department of Revenue, with your exact business name matching your bond and insurance exactly
• Verified, active L&I registration confirmed for every sub before they start any job
• The 7-part independent contractor test genuinely satisfied by the subs you use - real independent operators with their own clients and equipment
• Plumbing and electrical subs verified on both their contractor registration and their separate trade licence
• Signed sub agreements specifying genuine independence, including each sub's responsibility for their own workers' comp

Washington does not require you to prove trade skill. It requires that you are registered, bonded, and insured, and that the subs doing the physical work are too. The model fits the state's framework - as long as you take the registration requirement seriously for everyone in the chain, not just yourself.

If you are building your sub roster in Washington, how to find subcontractors covers the verification steps in detail. For the sub contract structure that reflects genuine independence under a test like Washington's 7-part check, see what contracts you need for construction arbitrage.

Last checked: 22 August 2026.