Washington Contractor Licenses: Updated Requirements Guide
Washington regulates contractors and skilled trades at the state level through the Department of Labor & Industries (L&I). Electrical professionals are certified and supervised under L&I’s Electrical Program, plumbers are certified through L&I’s Plumber Certification Program, and all construction contractors register with L&I under Chapter 18.27 RCW. The Washington State Department of Health (DOH) separately issues Backflow Assembly Tester (BAT) certifications referenced by L&I’s plumbing rules.
Because licensing and registration are centralized, most businesses start with L&I’s contractor registration, then add any trade certifications needed for their scope (for example, electrician or plumber certification). Local jurisdictions issue building permits and verify state registration, but licensure and trade competency are set at the state level. We highlight several representative licenses and authorities for Washington below; this guide is updated periodically as additional topics are refined based on reader requests.
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Overview of Washington Contractor Licensing
Washington’s Department of Labor & Industries (L&I) administers statewide programs that cover contractor registration, electrical licensing and certification, and plumber certification. Under Chapter 18.27 RCW, all businesses and individuals that construct, alter, repair, add to, or subtract from real property must register as construction contractors with L&I. Separate electrical and plumbing credentials are required for those trades, with examinations and continuing education governed by L&I’s rules and Washington Administrative Code (WAC).
L&I’s Electrical Program oversees electrical contractors, electrician certificates, and master electrician certificates under Chapter 19.28 RCW and Chapter 296‑46B WAC. L&I’s Plumber Certification Program sets experience, examination, and renewal requirements for the PL01 Journey Level Plumber and PL02 Residential Specialty Plumber, and licenses plumbing contractors with dedicated bond and insurance requirements. The Washington State Department of Health (DOH) issues Backflow Assembly Tester certifications that L&I references for certain plumbing scopes.
Local building departments issue permits and are required by RCW 18.27 to verify that the contractor is currently registered with L&I before issuing certain building permits. This approach keeps licensure and trade competency centralized at the state level, while allowing cities and counties to enforce local permitting and inspection processes. Prospective contractors and tradespeople should begin with L&I’s licensing and registration pages, then consult their local building department for permit procedures.
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Electrician Licenses in Washington
Washington regulates electrical work with 3 license types.
Electrical Contractor License
Regulatory authority: Washington State Department of Labor & Industries – Electrical Program (Electrical Contractor)
Requirements
Electrical contractors must have an assigned certified electrical administrator or master electrician who is responsible for code compliance and supervision. An original $4,000 electrical/telecommunication contractor surety bond or assignment of savings is required. A workers’ compensation account is required if the business hires employees.
Fees
Application and renewal fees are set in L&I’s Electrical Program fee schedules referenced in WAC 296‑46B‑909.
Insurance and Bond
Maintain the $4,000 surety bond (or assignment of savings) continuously; ensure workers’ compensation coverage if employing workers.
Renewal
Electrical contractor licenses must be renewed every two years. Online renewal is available when the bond, administrator assignment, and citation status are current.
Electrician Certificate
Regulatory authority: Washington State Department of Labor & Industries – Electrical Program (Electrical Laws, Rules & Policies)
Requirements
Experience requirements for electrician certificates, including categories and minimum hours, are established in Chapter 19.28 RCW and Chapter 296‑46B WAC.
Exam
Examinations are administered under WAC 296‑46B‑909 and follow the National Electrical Code (NEC) and Washington electrical safety standards adopted by L&I. Contact L&I to verify current exam logistics and scheduling.
Fees
Issuance, renewal, and examination fees are specified in WAC 296‑46B‑909.
Renewal
Electrician certificate holders must complete continuing education each renewal cycle, including at least 8 hours of NEC code update and 4 hours of WAC rule update.
Master Electrician Certificate
Regulatory authority: Washington State Department of Labor & Industries – Electrical Program (Electrical Laws, Rules & Policies)
Requirements
Experience requirements for master electrician certification are defined in Chapter 19.28 RCW and Chapter 296‑46B WAC.
Exam
Master electrician examinations are administered under WAC 296‑46B‑909 using the current NEC and Washington rules adopted by L&I. Contact L&I to confirm current exam procedures and any testing provider details.
Fees
Certificate issuance, renewal, and examination fees are included in the WAC 296‑46B‑909 fee schedule.
Renewal
Master electricians renew their certificates under L&I rules and must complete required continuing education.
Exam Prep: PDF study guide with 1,500-2,500 questions, complete answer keys, and reference locators to exact code sections. Study offline; no time or use limits. Washington 01 Master Electrician Practice Test.
Plumbing Licenses in Washington
Washington regulates plumbing work with 4 license types.
Journey Level Plumber (PL01)
Regulatory authority: Washington State Department of Labor & Industries – Plumber Certification Program (Plumber Certification)
Requirements
Requires at least four years and a minimum of 8,000 hours working as a plumber trainee under supervision of a certified journey level plumber.
Exam
Applicants must pass a journey-level plumber certification examination administered by the Washington State Plumber Certification Program.
Fees
Certificate issuance, renewal, and examination fees are established in WAC 296‑400A‑045.
Renewal
Renewal requirements, including any continuing education obligations, are set by L&I’s plumber certification rules.
Residential Specialty Plumber (PL02)
Regulatory authority: Washington State Department of Labor & Industries – Plumber Certification Program (Plumber Certification)
Requirements
Requires at least three years and 6,000 hours of work in the residential plumbing specialty under supervision of a certified residential or journey-level plumber.
Exam
Applicants must pass a residential specialty plumber certification examination administered by L&I’s program.
Fees
Certificate and examination fees are governed by WAC 296‑400A‑045.
Renewal
Renewal follows the plumber certification program rules.
Plumbing Contractor License
Regulatory authority: Washington State Department of Labor & Industries – Plumbing Contractor Licensing (Licensed Plumbing Contractor)
Requirements
Requires designation of a certified plumber as the company’s dedicated plumber and completion of L&I and Department of Revenue business registration steps.
Fees
Application fee $148.10 for the plumbing contractor license and $53.20 for the designated plumber assignment. Overall plumbing contractor fees are referenced in WAC 296‑400A‑045.
Insurance and Bond
Requires a continuous plumbing contractor surety bond or assignment of savings in the amount of $6,000 and a general liability policy of $200,000 public liability and $50,000 property damage, or a $250,000 combined single limit.
Renewal
Maintain active status with continuous bond, liability coverage, and a current designated plumber assignment. Renewal procedures are set by L&I’s plumbing contractor program.
Backflow Assembly Tester Certification (BAT)
Regulatory authority: Washington State Department of Health – Backflow Assembly Tester Certification (doh.wa.gov)
Requirements
Requires meeting Department of Health experience or training criteria to obtain and maintain an active BAT certification, as referenced in L&I plumber certification requirements.
Education and Exam
Requires specialized training in backflow prevention and testing. BAT candidates must pass written and practical examinations administered under DOH rules.
Fees
Application, examination, and renewal fees are set by the Department of Health for BAT certification.
Renewal
An active DOH BAT certification is required for plumbers performing specified specialty scopes of work referenced by L&I.
HVAC Licenses in Washington
Washington does not maintain a separate state HVAC/mechanical trade license in L&I’s licensing programs. HVAC businesses that construct, alter, or repair building systems register with L&I as construction contractors under Chapter 18.27 RCW, selecting the appropriate general or specialty registration and maintaining the required bond and liability insurance.
How to proceed for HVAC work: Register your business through L&I’s Contractor Registration Program and confirm permits with your local building department. For current HVAC-related registration and documentation requirements, start at L&I’s contractor page: Register as a Contractor or call 1-800-647-0982.
General Contractor Licenses in Washington
Washington general contractor licensing includes 2 types.
Construction Contractor Registration – General Contractor
Regulatory authority: Washington State Department of Labor & Industries – Contractor Registration Program (Register as a Contractor)
Requirements
No minimum trade experience is required for general contractor registration. Applicants complete business registration (including a Unified Business Identifier through the Department of Revenue), then file the required bond and liability insurance with L&I.
Fees
The contractor registration application fee is listed as $150.20, with final amounts governed by WAC 296‑200A fee schedules and current L&I forms.
Insurance and Bond
General contractors must file a $30,000 surety bond and maintain liability insurance as specified in RCW 18.27.
Renewal
Registration must be renewed with updated bond and insurance according to RCW 18.27 and WAC 296‑200A.
Construction Contractor Registration – Specialty Contractor
Regulatory authority: Washington State Department of Labor & Industries – Contractor Registration Program (Register as a Contractor)
Requirements
Specialty contractors follow the same application steps as general contractors and identify their specialty scope of work during registration.
Fees
Specialty contractor registration uses the same application process and fee schedule under WAC 296‑200A as general contractors.
Insurance and Bond
Specialty contractors must file a $15,000 surety bond and maintain liability insurance in accordance with RCW 18.27.
Renewal
Renewal requires maintaining current bond and insurance per RCW 18.27 and WAC 296‑200A.
Roofing Licenses in Washington
Washington does not issue a separate state roofing trade license. Roofing businesses register with L&I as construction contractors under Chapter 18.27 RCW and maintain the required bond and liability insurance (general contractors: $30,000 bond; specialty contractors: $15,000 bond). Local building departments may require permits for roofing work; confirm permitting procedures with your jurisdiction while maintaining your L&I registration in good standing.
Specialty Trade Licenses in Washington
Washington regulates specialty trades with 1 license type noted below. Additional specialty scopes are commonly handled through L&I’s contractor registration categories and, where applicable, through trade-specific certifications such as electrical or plumbing.
Electrical Administrator Certificate
Regulatory authority: Washington State Department of Labor & Industries – Electrical Program (Electrical Laws, Rules & Policies)
Requirements
Applicants must meet experience requirements and pass an examination as outlined in WAC 296‑46B‑909 and Chapter 19.28 RCW. Electrical administrators are responsible for ensuring that an electrical contracting business complies with Washington’s electrical laws and rules.
Exam
Administrator examinations cover electrical safety standards, Washington’s adoption of the NEC, and applicable state rules administered by L&I. Contact L&I for current exam procedures and scheduling details.
Fees
Fees for administrator certificate issuance, renewal, and examination are included in the WAC 296‑46B‑909 fee schedule.
Renewal
Certificates are renewed under L&I electrical program rules, including required continuing education where applicable.
Exam Prep: PDF study guide with 1,500-2,500 questions, complete answer keys, and reference locators to exact code sections. Study offline; no time or use limits. Washington 01 General Administrator Practice Test.
Application Process
- Register the business entity and obtain a Unified Business Identifier (UBI) through the Washington Department of Revenue Business Licensing Service.
- Obtain the required continuous contractor surety bond from an approved surety insurer, such as $30,000 for general contractors or $15,000 for specialty contractors, as specified in RCW 18.27.
- Purchase general liability insurance meeting RCW 18.27 requirements and maintain workers’ compensation coverage if employing workers.
- Complete the Application for Construction Contractor Registration (Form F625‑001‑000) and any trade‑specific L&I applications such as the Plumbing Contractor License application.
- Submit applications, supporting documents, and fees to a local L&I office in person or by mail. Do not advertise, bid, or perform work as a contractor until your L&I registration or trade license is issued and active.
Timeline: Processing timelines for contractor and trade licenses are not specified in the cited sources and may vary; applicants should allow several weeks and confirm directly with L&I.
Required Documents
- Completed contractor registration application form (F625‑001‑000) for construction contractors.
- Evidence of business registration and UBI from the Department of Revenue Business Licensing Service.
- Original contractor surety bond or assignment of savings for the required amount under RCW 18.27.
- Certificate of general liability insurance meeting minimum coverage requirements.
- For plumbing contractors, completed Plumbing Contractor License application and Designated Plumber Assignment forms with notarized signatures.
Reciprocity
Available with: Idaho (journey level plumbers)
Requirements: Washington has reciprocal certification with Idaho for journey level plumbers, allowing qualified Idaho certificate holders to obtain Washington journey level plumber certification subject to plumber certification program conditions.
Limitations: Reciprocity is limited to journey level plumbers. Other Washington credentials, including electrical certificates and contractor registrations, follow Washington’s standard application, examination, and registration processes.
Frequently Asked Questions
How long does it take to get a contractor license in Washington?
Timelines vary by application volume and whether your documents (bond, insurance, business registration) are complete. Plan for several weeks and verify current processing times directly with L&I.
Can I transfer my license from another state to Washington?
Washington offers reciprocity with Idaho for journey level plumbers under L&I’s plumber certification program. Other contractor, electrical, and specialty credentials must be earned through Washington’s standard process.
What happens if I fail an L&I trade exam?
Examination retake policies are administered by L&I’s electrical and plumbing programs. Contact L&I for current retake procedures, waiting periods, and any applicable fees.
Do I need insurance?
Yes. Contractors must maintain liability insurance and a surety bond under RCW 18.27 (general contractor bond: $30,000; specialty contractor bond: $15,000). Plumbing contractors must carry a separate plumbing contractor bond ($6,000) and liability coverage of $200,000 public liability and $50,000 property damage (or $250,000 combined single limit). Additional coverage may be required if you employ workers (workers’ compensation).
How do I renew my license or registration?
Contractor registrations are renewed by keeping bond and insurance current and submitting renewal forms and fees per RCW 18.27 and WAC 296‑200A. Electrical contractors renew every two years; electricians and administrators complete required continuing education before renewing. Plumber certifications and plumbing contractor licenses renew under L&I’s plumbing rules.
Do cities have different rules than the state?
Cities and counties issue permits and, under RCW 18.27, verify your current L&I contractor registration before issuing certain building permits. Confirm permit submittal requirements, inspections, and local codes with the building department where the project is located.
Where can I find practice tests for Washington exams?
We offer comprehensive PDF practice tests for key Washington trade exams. Materials typically include 1,500–2,500 code‑relevant questions, answer keys for every question, and reference locators pointing to exact code sections. Study offline at your own pace; there are no time or use limits. Browse Washington contractor practice tests.
Washington · Practice tests
Washington contractor license practice tests
The Washington practice tests we publish today: comprehensive PDF guides, typically 1,500 to 2,500 questions each, with full answer keys and reference locators to the exact code sections. We add new tests regularly, so if your license isn’t listed here, contact us and we’ll build it.
- Business, Law, and Project Management (NASCLA) Reference Practice Test
- Installing Hardwood Flooring NOFMA - Reference Practice Test
- National Electrical Code (NEC) 2017 Practice Test
- WAC Chapter 296-46B and Revised Code 19.28 - Reference Practice Test
- Washington 01 General Administrator License Practice Test
- Washington 01 General Electrician License Practice Test
- Washington 01 General Master Electrician License Practice Test
- Washington 02 Residential Administrator License Practice Test
- Washington 02 Residential Electrician License Practice Test
- Washington 02 Residential Master Electrician License Practice Test
- Washington 03 Pump and Irrigation Administrator License Practice Test
- Washington 03 Pump and Irrigation Electrician License Practice Test
- Washington 03 Pump and Irrigation Master Electrician License Practice Test
- Washington 03A Domestic Pump Administrator License Practice Test
- Washington 03A Domestic Pump Electrician License Practice Test
- Washington 03A Domestic Pump Master Electrician License Practice Test
- Washington 04 Signs Administrator License Practice Test
- Washington 04 Signs Electrician License Practice Test
- Washington 04 Signs Master Electrician License Practice Test
- Washington 06 Limited Energy Administrator License Practice Test
- Washington 06 Limited Energy Electrician License Practice Test
- Washington 06 Limited Energy Master Electrician License Practice Test
- Washington 06A HVACR Administrator License Practice Test
- Washington 06A HVACR Electrician License Practice Test
- Washington 06A HVACR Master Electrician License Practice Test
- Washington 06B HVACR Restricted Administrator License Practice Test
- Washington 06B HVACR Restricted Electrician License Practice Test
- Washington 06B HVACR Restricted Master Electrician License Practice Test
- Washington 07 Nonresidential Maintenance Administrator License Practice Test
- Washington 07 Nonresidential Maintenance Electrician License Practice Test
- Washington 07 Nonresidential Maintenance Master Electrician License Practice Test
- Washington 07A Nonresidential Lighting Maintenance & Lighting Retrofit Electrical Administrator License Practice Test
- Washington 07A Nonresidential Lighting Maintenance & Lighting Retrofit Electrician License Practice Test
- Washington 07A Nonresidential Lighting Maintenance & Lighting Retrofit Master Electrician License Practice Test
- Washington 07B Residential Maintenance Administrator License Practice Test
- Washington 07B Residential Maintenance Electrician License Practice Test
- Washington 07B Residential Maintenance Master Electrician License Practice Test
- Washington 07C Nonresidential Maintenance Restricted Administrator License Practice Test
- Washington 07C Nonresidential Maintenance Restricted Electrician License Practice Test
- Washington 07C Nonresidential Maintenance Restricted Master Electrician License Practice Test
- Washington 07D Appliance Repair Administrator License Practice Test
- Washington 07D Appliance Repair Electrician License Practice Test
- Washington 07D Appliance Repair Master Electrician License Practice Test
- Washington 07E Equipment Repair Administrator License Practice Test
- Washington 07E Equipment Repair Electrician License Practice Test
- Washington 07E Equipment Repair Master Electrician License Practice Test
- Washington 09 Telecommunications Administrator License Practice Test
- Washington 10 Door, Gate & Similar Systems Administrator License Practice Test
- Washington 10 Door, Gate & Similar Systems Electrician License Practice Test
- Washington 10 Door, Gate & Similar Systems Master Electrician License Practice Test
Related Official Resources
Official Sources for Further Details:
-
Register as a Contractor – Labor & Industries
https://www.lni.wa.gov/licensing-permits/contractors/register-as-a-contractor/
Official Board Site | Accessed: 2026-10-11 -
Contractor Laws & Rules – Labor & Industries
https://lni.wa.gov/licensing-permits/contractors/contractor-laws-rules
Official Board Site | Accessed: 2026-10-11 -
Plumber Certification – Labor & Industries
https://www.lni.wa.gov/licensing-permits/plumbing/plumber-certification/
Official Board Site | Accessed: 2026-10-11 -
Electrical Contractor – Labor & Industries
https://www.lni.wa.gov/licensing-permits/electrical/electrical-licensing-exams-education/electrical-contractor
Official Board Site | Accessed: 2026-10-11 -
Licensed Plumbing Contractor – Labor & Industries
https://www.lni.wa.gov/licensing-permits/plumbing/licensed-plumbing-contractor/
Official Board Site | Accessed: 2026-10-11 -
Verify a Contractor, Tradesperson or Business – Labor & Industries
https://lni.wa.gov/licensing-permits/contractors/hiring-a-contractor/verify-contractor-tradesperson-business
Official Board Site | Accessed: 2026-10-11 -
Licensing & Permits Overview – Labor & Industries
https://www.lni.wa.gov/licensing-permits/index
Official Board Site | Accessed: 2026-10-11 -
Applying for Your WA Business License (F101‑079‑000) – Labor & Industries
https://lni.wa.gov/forms-publications/F101-079-000.pdf
Official Board Site | Accessed: 2026-10-11 -
Application for Construction Contractor Registration (F625‑001‑000) – Labor & Industries
https://www.lni.wa.gov/forms-publications/F625-001-000.pdf
Official Board Site | Accessed: 2026-10-11 -
Chapter 18.27 RCW – Contractors
https://app.leg.wa.gov/rcw/default.aspx?cite=18.27&full=true
State Statute | Accessed: 2026-10-11 -
Electrical Laws, Rules & Policies – Labor & Industries
https://www.lni.wa.gov/licensing-permits/electrical/laws-rules-policies
Official Board Site | Accessed: 2026-10-11 -
Seattle CAM 333 – Verifying Contractor Registration
https://www.seattle.gov/dpd/publications/cam/cam333.pdf
Official City Guidance | Accessed: 2026-10-11 -
Plumbing Licensing Requirements – Labor & Industries
https://www.lni.wa.gov/licensing-permits/plumbing/licensed-plumbing-contractor/licensing-requirements
Official Board Site | Accessed: 2026-10-11 -
Washington State Department of Health – Homepage
https://doh.wa.gov
Official Board Site | Accessed: 2026-10-11
Important Disclaimer
Information Currency: This guide reflects licensing information as available in 2026. Licensing requirements are subject to change without notice. Always verify current requirements with official sources.
Official Source: For current information, contact Multiple Authorities – See research notes:
- Website: https://www.lni.wa.gov
- Phone: 1-800-647-0982
No Legal Advice: This guide provides general information only. Consult with the licensing board or a qualified professional for guidance specific to your situation.
Local Permits: Washington building departments issue permits and verify L&I contractor registration under RCW 18.27. Always confirm local permitting requirements and inspections with your jurisdiction.