STATE LICENSE
RequiredWashington State Department of Labor & In…
HVAC is one of the 63 specialties L&I regulates under contractor registration. The entry requirements are financial, not technical: a $15,000 specialty surety bond, general liability insurance of $200,000 public liability plus $50,000 property damage or $250,000 combined single limit, and a $150.20 fee. There is no HVAC trade exam at the state level and no state-mandated continuing education for the registration.
The competency gate sits in the electrical chapter instead. Installing or maintaining equipment operated by electric current is the business of electrical contracting under RCW 19.28.041, so a firm that wires its own condensers, air handlers and thermostats needs an electrical contractor license, an assigned administrator or master electrician, a $4,000 electrical bond, and electricians certified in the HVAC/refrigeration specialty.
That specialty comes in two sizes. HVAC/refrigeration (06A) takes 4,000 hours of supervised experience and 48 hours of basic classroom instruction, and by rule is not limited by voltage, phase or amperage except in narrow carve-outs. HVAC/refrigeration-restricted (06B) takes 2,000 hours, and those hours credit toward the 4,000 needed for 06A - but they do not count toward a journey level (01) certificate.
The state sets the license floor; the county or city permit office controls filing, inspections, and local rules wherever the job site sits.
Two counters, two rules. Mechanical permits are issued and inspected by the local building department - Seattle SDCI, Tacoma, Spokane, or King County Permitting for unincorporated King County - and RCW 18.27.110 requires that office to verify your L&I contractor registration before issuing and to print the registration number on the permit. The electrical permit for the same changeout may come from an entirely different body: L&I everywhere except the 25 cities with their own electrical inspection programs and Tacoma Power's service area, which covers Tacoma, Fircrest, University Place, Fife and parts of Steilacoom, Lakewood and unincorporated Pierce County. Under RCW 18.27.130 none of these jurisdictions may impose its own HVAC contractor license; a city can only charge a general business license fee or tax gross receipts.
The local offices section below names the exact permit desk for every Washington county on file.
Each row names the issuing authority, cost, timeline, citation, and status behind the requirement — verified against the official source.
Published fees from the issuing authorities, as of September 2026. Local permit fees vary by project and jurisdiction — the basis is stated where a flat number does not exist.
2SHB 1534 raised specialty bonds effective for registrations issued or renewed on or after July 1, 2024. HVAC contractors renewing after that date had to post the higher bond first.
A firm holding both an HVAC specialty registration and an electrical contractor license carries two separate surety bonds - $15,000 with contractor registration and $4,000 with the Electrical Program.
A specialty contractor may not hire subcontractors at all. An HVAC company that wants a licensed electrical sub on its jobs needs the general classification and the $30,000 bond.
A practical sequence for a new HVAC contractor in Washington. Actual agency processing times are noted in the ledger above.
Each item names the issuing authority, cycle, and citation.
Statutory consequences with their citations — not estimates, not “commonly cited” guesses.
Advertising, bidding or performing HVAC work while unregistered is a gross misdemeanor, with each day after a citation and each worksite a separate offense.
Carrying on the business of installing or maintaining electrically operated equipment without an electrical contractor license violates chapter 19.28 RCW and draws a penalty on L&I's schedule after at most one 30-day warning.
Employing or working as an uncertified person in the electrical construction trade is unlawful and each day is a separate violation; the equipment installed cannot receive a permit or be energized.
Inside city limits, the city office listed here issues the permit; the county office serves unincorporated areas. Every office links to its official page.
Every fact in this file was checked against these official sources on September 2026.
Pending verification: Whether Washington imposes any state-level credential for fuel gas piping or gas appliance connection beyond the plumbing and electrical chapters was not confirmed on an official source. · The exact WAC 296-46B-920(2) scope language for the 06A and 06B specialties was not retrieved; the hour requirements and the crediting rule come from L&I's electrician page and rulemaking documents.
General information, not legal advice. Always confirm requirements, deadlines, and forms with the issuing authority before filing or contracting.
Store licenses, permits, policies, and renewal dates in one place.