State registration

Washington HVAC Registration Guide

State registration

Check the rules for this work

Washington’s Department of Labor & Industries requires contractor registration for HVAC contracting as a specialty. Specialty contractors work within their registered specialty.

Contractor registration is distinct from an individual trade license. Electrical, plumbing, boiler and other listed work can require additional credentials; review the specific work before applying.

Open official registration guidance ↗

Official source: lni.wa.gov. Retrieved 2026-09-05.

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Latest source retrieval: 2026-09-05.