A - General Engineering

B - General Building

C-2 - Insulation & Acoustical

C-4 - Boiler, Hot Water Heating & Steam Fitting

C-5 - Carpentry

C-6 - Cabinet and Mill Work

C-7 - Low Voltage Systems

C-8 - Concrete

C-9 - Drywall

C-10 - Electrical (General)

C-11 - Elevator Installation

C-12 - Earthwork & Paving

C-13 - Fencing

C-14 - Metal Roofing

C-15 - Flooring and Floor

C-16 - Fire Protection Engineering

C-17 - Glazing

C-20 - Warm-Air Heating, Ventilating

C-21 - Building Moving, Wrecking

C-23 - Ornamental Metals

C-26 - Lathing

C-27-Landscaping         

C-28 - Lock & Security Equipment

C-29 - Masonry

C-32 - Parking & Highway Improvement

C-33 - Painting & Decorating

C-34 - Pipeline

C-35 - Plastering

C-36 - Plumbing

C-38 - Refrigeration

C-39 - Roofing

C-42 - Sanitation Systems

C-43 - Sheet Metal

C-45 - Electrical Signs

C-46 - Solar

C-47 - General Manufactured

Housing

C-50 - Steel Reinforcing

C-51 - Steel Structural

C-53 - Swimming Pool

C-54 - Tile (ceramic & mosaic)

C-55 - Water Conditioning

C-57 - Well Drilling (water)

C-60 - Welding

C-61 - Limited Specialty