Washington HVAC, Plumbing & Electrical License Requirements

Last updated 2026. Requirements may change — always verify with your state licensing board.

HVAC

Renewal: Biennial registration
CE hours: Verify with board
Initial cost: ~$314 total state fees
License types: Specialty Contractor Registration + 06A or 06B Electrical Specialty Certification (because HVAC involves electrical)
Experience: 06A: 4,000 hours + exam / 06B: 2,000 hours
Exam: 06A/06B electrical specialty exam
Bond: $15,000 bond required for L&I registration
Insurance: Workers' comp required with employees; general liability recommended
Reciprocity: No formal reciprocity — verify with board
Board: Washington Department of Labor & Industries (L&I)
Website: lni.wa.gov

Plumbing

Renewal: Biennial
CE hours: CE required
Initial cost: ~$200
License types: Apprentice → Journeyman → Specialty Plumber
Experience: 8,000 hours for journeyman
Exam: State plumbing exam
Bond: Not required at state level
Insurance: Workers' comp required with employees; general liability recommended
Reciprocity: No formal reciprocity — verify with board
Board: Washington L&I
Website: lni.wa.gov

Electrical

Renewal: Biennial
CE hours: 24 CE hours per 3-year renewal
Initial cost: ~$200
License types: Apprentice → Journeyman → Master Electrician → Administrator
Experience: 8,000 hours for journeyman
Exam: NEC-based exam
Bond: Not required at state level
Insurance: Workers' comp required with employees; general liability recommended
Reciprocity: No formal reciprocity — verify with board
Board: Washington L&I
Website: lni.wa.gov

Washington has one of the most complex HVAC licensing structures in the country. Mechanical contractors must register with the Department of Labor & Industries (L&I) and hold an electrical specialty certification (06A or 06B) because HVAC work touches electrical systems. EPA 608 is also required for refrigerant handling.

Three separate credentials for HVAC: L&I contractor registration ($15K bond), 06A (4,000 hours) or 06B (2,000 hours) electrical specialty, and federal EPA 608. Plumbing and electrical contractors have simpler — though still demanding — paths through L&I.

TradesIQ tracks Washington license renewals, CE hours, bonds, and insurance certificates in one dashboard — with automated reminders before anything lapses.

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Washington

Full Washington guide →

HVAC

Renewal: Biennial registration
CE: Verify with board
Cost: ~$314 total state fees
Board: Washington Department of Labor & Industries (L&I)
Website: lni.wa.gov

Plumbing

Renewal: Biennial
CE: CE required
Cost: ~$200
Board: Washington L&I
Website: lni.wa.gov

Electrical

Renewal: Biennial
CE: 24 CE hours per 3-year renewal
Cost: ~$200
Board: Washington L&I
Website: lni.wa.gov

Requirements may change. Always verify with your state licensing board.

Frequently Asked Questions

Why do Washington HVAC contractors need an electrical license?

Because HVAC equipment routinely involves electrical work (line voltage to compressors, controls, etc.). Washington's 06A and 06B electrical specialty certifications cover the electrical portion of HVAC work and are required alongside L&I contractor registration.

What's the difference between 06A and 06B?

06A is the more comprehensive HVAC/refrigeration electrical specialty (requires 4,000 hours + exam). 06B is a more limited version (2,000 hours). Choose based on the scope of electrical work you'll perform.

Nearby states

New to renewals? Read our guide to contractor license renewal, or check a nearby state below.

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