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

C-21 Building Moving and Demolition

C-6 Cabinet, Millwork and Finish Carpentry

C-54 Ceramic and Mosaic Tile

C-8 Concrete

C-9 Drywall

C-10 Electrical

C-45 Electrical Sign

C-11 Elevators

C-13 Fencing

C-16 Fire Protection

C-15 Flooring and Floor Covering

C-5 Framing and Rough Carpentry

General Building (B)

General Engineering (A)

C-2 Insulation and Acoustical

C-27 Landscaping

C-35 Lathing and Plastering

C-28 Lock and Security Equipment

C-7 Low Voltage

C-47 General Manufactured Housing

C-29 Masonry

C-23 Ornamental Metal

C-34 Pipeline

C-36 Plumbing

C-38 Refrigeration

C-50 Reinforcing Steel

C-39 Roofing

C-42 Sanitation System

C-43 Sheet Metal

C-46 Solar

C-51 Structural Steel

C-53 Swimming Pools

C-20 Warm-Air Heating, Ventilating and Air -Conditioning

C-55 Water Conditioning

C-60 Welding

C-57 Well Drilling