Washington HVAC License Requirements

Washington Doesn't Issue an "HVAC License"

If you've been searching for a single state-issued HVAC license in Washington, you can stop. That credential doesn't exist. Washington's Department of Labor & Industries (L&I) doesn't administer, recognize, or issue anything called an "HVAC license."

What Washington requires instead is a combination of three separate credentials that together give you legal authority to perform HVAC work: state contractor registration through L&I, an individual electrical specialty certification (06A or 06B), and federal EPA Section 608 certification for refrigerant handling. Each credential comes from a different regulatory body, with its own application process, fees, and renewal cycle.

The confusion isn't accidental. Trade schools and private training programs routinely advertise "Washington HVAC License" prep courses. These produce certificates of completion — private paper that carries no regulatory weight. The actual credentials come from L&I and the EPA.

The Three Credentials You Need

1. L&I Contractor Registration (Business-Level)

Before your business can bid on, advertise, or perform any HVAC work in Washington, you need an active contractor registration from L&I under Chapter 18.27 RCW. This is the business credential — it establishes your legal standing as a contracting entity, not your personal trade competency.

Registration requires a $15,000 continuous surety bond for specialty contractors (or $30,000 for general contractors — these limits jumped significantly on July 1, 2024), a general liability insurance policy with at least $250,000 combined single limit, and a $150.20 filing fee. Registrations renew every two years.

One detail that trips people up: specialty contractors are prohibited from hiring subcontractors under WAC 296-200A-016. If your HVAC project requires gas piping or plumbing alterations, your own employees must perform that work. Planning to manage multi-trade jobs? You'll need a general contractor registration.

2. Electrical Specialty Certification (Individual-Level)

Because HVAC systems are hardwired appliances with complex control circuits, Washington requires an electrical credential for the person performing the installation work. Two specialty classifications apply:

06A (HVAC/Refrigeration System) — Unrestricted by voltage, phase, or amperage within the HVAC system boundary. Requires 4,000 hours of supervised trainee experience (75% supervision ratio) and 48 hours of basic electrical classroom instruction.

06B (HVAC/Refrigeration Restricted) — Limited to single-phase systems up to 250V and 120A. Requires 2,000 hours of supervised experience (100% supervision ratio) and 24 classroom hours.

Both exams are administered by PSI Services, open-book, and divided into an NEC/Theory section and a Washington Laws and Rules section. Passing score is 70% on each section.

3. EPA Section 608 Certification (Federal)

Any technician who handles, recovers, or purchases regulated refrigerants needs EPA Section 608 certification under the Clean Air Act. The exam is 80 multiple-choice questions across four sections (Core, Type I, II, and III), with a 70% passing threshold per section. Fees run $20–$150 depending on the testing provider, and the certification never expires.

The critical point: EPA 608 authorizes refrigerant handling only. It does not authorize electrical work, contracting, or independent operation. A technician holding just an EPA card who performs HVAC installations is violating both RCW 18.27 (unregistered contracting) and RCW 19.28 (unauthorized electrical work).

What It Costs to Get Fully Credentialed

The total startup cost for a new HVAC contractor in Washington runs roughly $2,200–$5,400, depending on your insurance rates and bond underwriting:

• Secretary of State LLC filing: $200
• UBI registration through DOR: $50
• Specialty contractor surety bond premium: $100–$300/year
• General liability insurance: $1,500–$3,000/year
• L&I contractor registration: $150.20
• 06A exam application to L&I: $114.60
• PSI exam fee: ~$65
• EPA 608 exam: $20–$150

All L&I fees increased by 6.51% on July 1, 2026, under CR-103 rulemaking. The figures above reflect the current schedule.

Municipal Licenses Add Another Layer

State credentials get you most of the way there, but several Washington cities enforce their own trade licensing on top of L&I requirements. Seattle requires a separate Refrigeration Contractor License and employs its own journeyman refrigeration mechanic licensing program (Classes A, B, and C). Spokane requires a Gas Heating Mechanic license for anyone doing gas-fitting work within city limits.

Holding a state contractor registration provides no exemption from these local requirements. A contractor legally registered with L&I who performs work in Seattle without the local SDCI license is still operating illegally within that jurisdiction.

Your Credential Roadmap

The Washington HVAC License Guide maps the complete credential sequence — from trainee card through contractor registration, including the municipal licensing matrix for Seattle, Spokane, and surrounding counties. It consolidates every form number, fee, and deadline into a single reference so you're not piecing together information from five different government portals.

See more Washington guides →