A-General Engineering Contractor, ASB – Asbestos Certification, B-2 – Residential Remodeling Contractors, B-General Building Contractor, C-2 – Insulation and Acoustical Contractor, C-4 – Boiler, Hot Water Heating and Steam Fitting Contractor, C-49 Tree and Palm Classification , C-5 – Framing and Rough Carpentry Contractor, C-6 – Cabinet, Millwork and Finish Carpentry Contractor, C-61 – Limited Specialty D-Trades, 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, C22 – Asbestos Abatement 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 – 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 – Well Drilling Contractor, C60 – Welding Contractor, HAZ – Hazardous Substance Removal Certification, Law & Business Only