State · CA
California trade licensing
California CSLB publishes excellent bulk contractor licensing data. Apprenticeship data from California DAS is only available through ASP scraping; all records are flagged as scraped, not authoritative, in the UI.
Primary regulator
California Department of Industrial Relations
www.dir.ca.gov →1-844-522-6734
Licensing boards by trade
Pick a trade in California
Aircraft Mechanic (A&P)
Services and inspects airframes and powerplants on aircraft: general aviation, airline, military.
Auto Body Technician
Repairs collision damage: panel replacement, frame straightening, refinishing.
Automotive Service Technician
Diagnoses, maintains, and repairs cars and light trucks: gasoline, diesel, and electric.
Boilermaker
Builds, installs, and repairs boilers, pressure vessels, and large tanks.
Carpenter
Frames, finishes, and builds structures from wood, steel, and composite materials.
Diesel Mechanic
Services and repairs diesel engines in trucks, buses, and heavy equipment.
Electrician
Installs and maintains electrical systems in homes, commercial buildings, and industrial sites.
Elevator Constructor
Installs, modernizes, and services elevators, escalators, and moving walkways.
Glazier
Cuts, installs, and replaces glass in windows, storefronts, curtain walls, and skylights.
Heavy Equipment Mechanic
Services construction, mining, agricultural, and material-handling machinery.
HVAC Technician
Installs, maintains, and repairs heating, ventilation, air conditioning, and refrigeration systems.
Industrial Maintenance Technician
Keeps manufacturing equipment running: mechanical, electrical, and control system upkeep.
Ironworker
Erects structural steel, reinforces concrete with rebar, and installs metal decking and ornamental iron.
Machinist
Makes precision metal parts using manual and CNC machine tools.
Mason
Lays brick, block, and stone for walls, foundations, chimneys, and veneers.
Millwright
Installs, aligns, dismantles, and repairs heavy industrial machinery.
Operating Engineer
Operates heavy construction equipment: cranes, excavators, dozers, graders, loaders.
Plumber
Installs and repairs water, waste, gas, and drainage systems in buildings.
Sheet Metal Worker
Fabricates and installs ductwork, roofing, cladding, and architectural sheet metal.
Welder
Joins and cuts metal using arc, MIG, TIG, stick, and oxy-fuel processes.