Four Checks Before Your Washington State Subcontractor Starts Work

Washington State runs a tighter ship than most when it comes to contractor oversight, and that's actually good news for general contractors (GCs) vetting subs. Every construction contractor in Washington is regulated the same way, prime or sub, so almost everything you need to check on a sub before they start work runs through a single agency: Washington State's Department of Labor & Industries (L&I).

Here are the four checks that should happen before any sub starts work on your Washington prevailing wage project.

1. Verify L&I Contractor Registration

Every contractor performing construction work in Washington must be registered with L&I under the Contractor Registration Act (RCW 18.27). This is not the same as having a Washington business license. They are separate requirements, and a sub can have one without the other.

An active L&I registration means the contractor has a surety bond on file, carries general liability insurance, and has a valid Unified Business Identifier (UBI) with the state. If any of that has lapsed, the registration is invalid. And on a public works project, an unregistered contractor is a problem the awarding agency can force you to solve: they can require the contractor be removed from the job. That means finding a replacement sub, mid-project, on your schedule and at your cost.

Where to check? L&I's contractor verification tool: secure.lni.wa.gov/verify

Confirm the registration is current, not expired or suspended. It takes thirty seconds. Do it before any contracts are signed.

2. Make Sure the Specialty Registration Actually Matches the Work

This is where GCs get burned, and it happens more than you would think.

Start with something most people outside Washington do not realize: contractor registration is not a competency license. There is no trade exam for general or specialty registration. A contractor files with L&I, posts the required bond, and shows workers' compensation compliance. Nobody tested them on the trade. The separately licensed trades are the exception, and those do require exams and their own credentials: electrical, plumbing, elevators, boilers, and asbestos work. For everything else, the category on the registration record is a self-declared scope, not a verified one. That is exactly why it's worth reading closely instead of assuming somebody upstream already vetted it.

Washington recognizes dozens of distinct specialty categories, and they are more granular than most people expect. The registration has to match what the sub is actually doing on your project.

Here is a classic example: your tile crew shows up for work. Their L&I registration says "soft floor layer." The problem: soft floor covers carpet, vinyl, and resilient flooring, not ceramic tile, not stone, not terrazzo. Those are a different specialty classification entirely.

The consequences here are real: your sub is working outside their registered scope, and their insurance may not cover the work actually being performed.

On a prevailing wage project, a registration mismatch is a red flag worth chasing down. Prevailing wage rates follow the work actually performed, not what the sub is registered for. So a soft floor layer installing ceramic tile still owes the tile setter rate for those hours. If nobody caught the registration mismatch, there is a fair chance nobody caught the classification either.

Before any specialty contractor starts, pull their registration and confirm the specialty category covers the specific scope of work on your project. "Similar" and "close enough" are not the same as "registered for this."

Where to check? The specialty category is listed on the registration record at secure.lni.wa.gov/verify

3. Confirm Workers' Compensation Is Current

Here is something Washington does differently from most states: it operates a state-run workers' compensation system. For most employers, there is no private insurance carrier. Premiums are paid quarterly, directly to L&I.

That means verifying workers' comp coverage in Washington is not about collecting a certificate of insurance. It is about confirming that the sub's account with L&I is active and in good standing: not lapsed, not in arrears, not suspended.

If a sub's quarterly payments have slipped and their coverage is no longer valid, a worker injured on your project can become your financial problem. This happens. Cash flow crunches hit small subs mid-project all the time.

Where to check? The same verification tool as the contractor registration lookup at secure.lni.wa.gov/verify. The record shows registration status, bond status, and workers' comp account standing together.

4. Check the L&I Debarment List

L&I maintains a list of contractors debarred from Washington public works projects under the Prevailing Wage Act (RCW 39.12). Debarment is the result of serious or repeated violations: unpaid wages, falsified certified payrolls, obstructing an audit.

A debarred contractor cannot lawfully work on your public works project. That's not a paperwork problem; it's a staffing problem. If a debarred sub turns up on your job, they have to be removed immediately. This leaves you scrambling to find a replacement mid-project, and on whatever timeline you were already working against. The awarding agency will not adjust your milestones because you skipped a two-minute check.

Where to check? L&I's debarred contractors list, published separately from the verification tool, at secure.lni.wa.gov/debarandstrike/ContractorDebarList.aspx

Two minutes is all it takes, so there's no reason to skip it.

The One-Stop Advantage (and Its Limits)

Compare this to Oregon, where you are bouncing between the CCB, BOLI, and DCBS depending on what you're trying to confirm. Washington, by contrast, consolidates contractor registration, workers' comp, and debarment under one agency.

One agency is not quite the same as one page, though. The first three checks share a single verification record. The debarment list lives on its own page, so budget an extra click for it.

None of that makes the checks optional. It just means there's no excuse for taking more than five minutes to do them. Build the L&I lookup into your subcontract execution workflow so it becomes automatic.

One more reason to run these checks before mobilization rather than after: the trend across the region is toward holding GCs responsible for what happens below them. Oregon made that explicit for wage liability with SB 426. Washington already ties your project standing to who you let on site. In both states, the cheapest version of the problem is the one you catch during subcontract execution. [See also: Oregon SB 426: Your Sub Didn't Pay a Worker. Now It's Your Problem]

Naylor Construction Consulting (NCC) manages prevailing wage compliance on publicly funded projects in Washington, Oregon, and nationwide, and sub vetting is where it starts. If you want these checks built into your subcontract process instead of remembered case by case, let's talk.

Frequently Asked Questions

Is L&I registration the same as a Washington business license? No. A business license through the Department of Revenue and an L&I contractor registration are separate. A sub can have one without the other. For construction work, the L&I registration is what you need to verify.

Does L&I test contractors on their trade before issuing a registration? Not for general or specialty contractor registration. Washington State requires registration, not licensure, for most construction work: a bond, liability insurance, and workers' compensation compliance, but no trade exam. The separately licensed trades are different. Electrical, plumbing, elevator, boiler, and asbestos work all require their own licenses and exams. For everything else, treat the specialty category on the record as the contractor's own description of their scope.

What if a sub's specialty registration is close to the right category, but not exact? Don't assume. Washington's specialty categories are specific, and the consequences of a mismatch compound on prevailing wage projects: potential scope violation, insurance that may not apply, and a strong hint that worker classification deserves a second look. If there is any ambiguity, ask the sub to confirm with L&I before they mobilize.

Does the sub's registration category determine the prevailing wage rate? No. Prevailing wage rates follow the work actually performed, not the category a contractor happens to be registered under. For example, a sub registered as a soft floor layer who installs ceramic tile owes the tile setter rate for those hours. The registration mismatch does not change what is owed, but it is a useful signal that classification may have gone wrong too.

Does Washington State have a prevailing wage bond like Oregon? Washington takes a different approach. Instead of a separate prevailing wage bond, the state uses the Intent and Affidavit certification process: subs file an Intent to Pay Prevailing Wages with L&I before starting work, and an Affidavit of Wages Paid when the work is complete. Confirming those filings are in place, and on time, is a key part of public works project management in Washington.

Should I re-verify these during a longer project? Yes, at minimum for workers' comp. Quarterly payment cycles mean coverage status can change between project start and finish. On any job running six months or more, a midpoint check is worth doing.

[Disclaimer: This article is intended for general informational purposes only and does not constitute legal advice. Contractor registration, licensing, workers' compensation, and prevailing wage requirements depend on the specific facts and circumstances of each project and scope of work. Contractors should consult qualified legal counsel regarding their obligations under Washington law.]