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- A | General Engineering Contractor
- B | General Building Contractor
- C-2 | Insulation and Acoustical Contractor
- C-4 | Boiler, Hot Water Heating and Steam Fitting Contractor
- C-5 | Framing and Rough Carpentry Contractor
- C-6 | Cabinet, Millwork and Finish Carpentry Contractor
- C-7 | Low Voltage Systems Contractor
- C-8 | Concrete Contractor
- C-9 | Drywall Contractor
- C10 | Electrical Contractor
- C11 | Elevator Contractor
- C12 | Earthwork and Paving Contractors
- C13 | Fencing Contractor
- C15 | Flooring and Floor Covering Contractors
- C16 | Fire Protection Contractor
- C17 | Glazing Contractor
- C20 | Warm-Air Heating, Ventilating and Air-Conditioning Contractor
- C21 | Building Moving/Demolition Contractor
- C23 | Ornamental Metal Contractor
- C27 | Landscaping Contractor
- C28 | Lock and Security Equipment Contractor
- C29 | Masonry Contractor
- C31 | Construction Zone Traffic Control Contractor
- C32 | Parking and Highway Improvement Contractor
- C33 | Painting and Decorating Contractor
- C34 | Pipeline Contractor
- C35 | Lathing and Plastering Contractor
- C36 | Plumbing Contractor
- C38 | Refrigeration Contractor
- C39 | Roofing Contractor
- C42 | Sanitation System Contractor
- C43 | Sheet Metal Contractor
- C45 | Electrical Sign Contractor
- C46 | Solar Contractor
- C47 | General Manufactured Housing Contractor
- C50 | Reinforcing Steel Contractor
- C51 | Structural Steel Contractor
- C53 | Swimming Pool Contractor
- C54 | Ceramic and Mosaic Tile Contractor
- C55 | Water Conditioning Contractor
- C57 | Water Well Drilling Contractor
- C60 | Welding Contractor
- C61 | Limited Specialty
- ASB | Asbestos Certification
- HAZ | Hazardous Substance Removal Certification
