HVAC Contractor Permit Requirements in Seattle, WA

Complete permit and license guide for starting a hvac contractor in Seattle, King County, Washington.

$700 -- $2500 8–14 weeks to obtain all licenses 4 requirements

Not legal advice. Requirements may change — always verify with your local government authority before applying. Last verified: .

Seattle / King County Requirements

1 requirement
1

City of Seattle — Mechanical Permit

Seattle requires a mechanical permit for HVAC installation from the Seattle Department of Construction and Inspections (SDCI). Contractors must hold a valid Washington state ACH license and a Seattle business license.

$100–$600 per project2–6 weeks
Official government source

Washington State Requirements

1 requirement
1

Washington State Department of Labor and Industries — HVAC Contractor License

Washington requires HVAC contractors to hold an Air Conditioning and Heating (ACH) specialty contractor license from the Department of Labor and Industries. A licensed journeyman must be on staff. Exam, $6,000 bond, and workers' compensation coverage required.

$200 application fee + $75 exam fee + $6,000 bond (~$50–$100/year)6–10 weeks
Official government source

Federal Requirements

2 requirements
1

EPA Section 608 Technician Certification

Federal law requires all HVAC technicians who purchase or handle refrigerants to be certified under EPA Section 608 of the Clean Air Act. Certification is available in Type I (small appliances), Type II (high-pressure), Type III (low-pressure), and Universal categories. Certification is obtained through an EPA-approved testing organization such as ESCO Institute or NATE.

$20–$60 (exam fee)1–2 weeks (exam scheduling)
Official government source
2

EIN (Employer Identification Number)

Required if you have employees or operate as an LLC or corporation. Free from the IRS.

FreeImmediate (online application)
Official government source

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