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Washington trade license requirements

Per-trade licensing path. Always confirm with the state board before testing.

Career prep, not a license.

Plumbing

Washington Certified Plumber (PL01 Journey / PL02 Residential / PL03 Specialty)

Verified 6/12/2026
Required hours / experience
PL01 Journey: 8,000 hrs supervised + 4 yrs apprenticeship classroom. PL02 Residential: 6,000 hrs.
Exam
Washington Plumber Examination (UPC + WAC 296-400A) (PSI Services)
Notes
Individual plumbers need a Certificate of Competency; the business is separately licensed as a Plumbing Contractor with bond ($6k+) and $200k liability. CEU: 16 hrs per 3-yr renewal. Certificate ~$76/3yrs, contractor $359/2yrs.

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Solar

Solar / PV Installer (often under Electrical or Specialty)

Verified 5/24/2026
Required hours / experience
NABCEP-recommended 58+ hrs training + field experience
Exam
NABCEP PV Associate / Installation Professional (NABCEP)
Notes
General overview — verify exact requirements with the Washington State Department of Labor & Industries before scheduling exams.

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General Contractor

General Contractor License

Verified 5/26/2026
Required hours / experience
Varies by project size
Exam
Business & Law + Trade Exam (PSI / Prometric)
Licensing authority
State Contractor Licensing Board
Notes
Most states require licensing for projects above a dollar threshold; some are local-only.

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Roofing

Roofing Contractor License

Verified 5/26/2026
Required hours / experience
None to 4 yrs experience
Exam
Roofing Trade + Business & Law (PSI)
Licensing authority
State Contractor Licensing Board
Notes
Many states regulate roofing under general contractor rules; check local jurisdiction.

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Roofing 101 — Start Here (Free) • Self-paced + practice exam

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Low-Voltage

Low-Voltage / Limited Energy License

Verified 5/26/2026
Required hours / experience
2-4 yrs experience
Exam
Low-Voltage Trade Exam (PSI / ICC)
Licensing authority
State Electrical Board
Notes
Covers alarm, AV, data, security, and telecom installations. Often a sub-class of electrical.

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Pest Control

Commercial Pesticide Applicator License

Verified 5/26/2026
Required hours / experience
Training + exam
Exam
Core + Category Exams (State Department of Agriculture)
Licensing authority
State Department of Agriculture
Notes
EPA-mandated certification; categories vary (general, termite, fumigation).

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Landscaping

Landscape Contractor License

Verified 5/26/2026
Required hours / experience
Varies; often optional
Exam
Business & Law (if required) (PSI / state board)
Licensing authority
State Contractor Licensing Board
Notes
Many states do not require a landscape-specific license; check local rules and irrigation/pesticide endorsements.

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Landscaping & Irrigation 101 — Start Here (Free) • Self-paced + practice exam

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Electrical

Washington Electrical Contractor (01 General / 02 Residential / 06 Limited)

Verified 6/12/2026
Required hours / experience
01 Journeyman: 8,000 hrs supervised experience + 96 hrs classroom. 02 Residential: 4,000 hrs. Administrator: additional 2 yrs as licensed journeyman.
Exam
Washington Master Electrician / Administrator Exam (NEC + WAC 296-46B) (PSI Services)
Notes
Washington requires every individual electrician to hold a personal certificate (01/02/06) AND the business to be a licensed Electrical Contractor with bond ($4,000–$12,000 depending on class) and $250k general liability. License fees: ~$359/2yrs for contractor, $80.20/3yrs for individual cert. CEU: 24 hrs per renewal.

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HVAC

Washington — No state HVAC license; Electrical 06A (HVAC/Refrigeration) certificate + EPA 608

Verified 6/12/2026
Required hours / experience
06A: 4,000 hrs HVAC/Refrigeration experience under a licensed electrician.
Exam
WA 06A HVAC/Refrigeration Specialty Exam (PSI Services)
Notes
WA licenses HVAC under the electrical code as Specialty 06A. Contractors register separately with L&I. Federal EPA 608 needed for refrigerant. 06A certificate $80.20/3yrs.

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