Washington Contractor License Exam Guide (2026)

How Washington licenses contractors

All contractors must register with L&I, post a surety bond ($12k general/$6k specialty), carry $200k/$50k liability insurance, and obtain a Unified Business Identifier (UBI). Electrical contractors, plumbers, and elevator companies must employ certified administrators who pass state exams.

Expect Cascadia subduction seismic design, 150-psf mountain snow loads, and coastal corrosion. Exams emphasize waterproofing, blower-door targets, and silica exposure rules.

Official source: Washington Department of Labor & Industries (L&I)

Washington contractor license types

Electrical contractors must maintain a $4k bond and hire a journeyman-level administrator. Plumbers require Department of Health certification for backflow testing.

What's on the Washington contractor exam

L&I exams are offered in Tumwater, Spokane, Yakima, Mount Vernon, and via PSI for certain specialties.

What Washington exam questions emphasize

• Washington Administrative Code (WAC 296-46B) for electrical
• Uniform Plumbing Code with Washington amendments
• Washington State Energy Code 2018
• Lien law (RCW 60.04) and retainage requirements

Exam-day logistics

• Schedule online after L&I approves your application
• Bring two IDs and the allowed code books with tabs
• Scores are posted immediately; update bond and insurance if you change business entities

Trade-specific exam guides

If you're licensing in a single trade rather than the Washington general contractor classification, the dedicated trade hub will get you to the right code book and exam structure faster.

• General contractor exam guide — IBC/IRC, NASCLA acceptance, and Business & Law.
• Electrical contractor exam guide — NEC (NFPA 70) calculations and grounding/bonding.
• Plumbing contractor exam guide — IPC/UPC drainage sizing, venting, and backflow.
• HVAC contractor exam guide — IMC ventilation, refrigerant management, and load calcs.

Washington code books & approved references (2026)

Always confirm the exact editions and tab rules in your candidate bulletin before exam day. Editions can change between license cycles.

• National Electrical Code 2023
• Uniform Plumbing Code 2018
• Washington Administrative Code 296-46B and 296-200A
• Washington State Energy Code 2018
• RCW 60.04 Mechanics' Liens
• OSHA 29 CFR 1926

Fees & timeline for the Washington contractor license

• $124 contractor registration fee (two years)
• $12k bond for generals/$6k bond for specialties
• $200k/$50k liability insurance minimums
• Electrical/plumbing exam fees (~$100) and certification renewals
• City business licenses (Seattle, Tacoma, Spokane)

Use the All States hub for budgeting; confirm fees with L&I.

Washington Business & Law focus

While contractor registration has no exam, L&I administrators and plumbers must pass exams covering licensing law, safety, and energy code.

• Register for Washington excise tax and collect sales/B&O taxes
• Understand pre-lien notices and retainage trust accounts
• Maintain workers-comp coverage through L&I
• Follow silica, fall protection, and wildfire smoke safety plans

Practice with our national Business & Law exam hub for cross-state baseline rules.

A focused 4-week study plan for the Washington exam

Because expect Cascadia subduction seismic design, 150-psf mountain snow loads, and coastal corrosion, this four-week outline targets what Washington field inspectors and your licensing board exam items actually test—not generic national prep.

1. Week 1 — Map the exam. Pull your current candidate bulletin, list every reference, and confirm the modules you have to pass. Start a one-page error log. Spend extra time on: Washington Administrative Code (WAC 296-46B) for electrical.
2. Week 2 — Code book navigation. Drill open-book lookups (or memorisation drills if your module is closed-book) until you can find any answer in under 60 seconds. Anchor practice around: Uniform Plumbing Code with Washington amendments.
3. Week 3 — Business & Law. While contractor registration has no exam, L&I administrators and plumbers must pass exams covering licensing law, safety, and energy code. Layer in scenario-based questions on contracts, lien notice, payroll, and insurance.
4. Week 4 — Full simulations. L&I exams are offered in Tumwater, Spokane, Yakima, Mount Vernon, and via PSI for certain specialties. Run two full-length timed simulations. Review every miss with a one-sentence rule statement.