D W Nicholson Corporation

B: General Building Contractor

Authorizes construction of structures including residential, commercial, and industrial buildings requiring at least two unrelated building trades or crafts. May take prime contracts or subcontracts for framing or carpentry. May subcontract all specialty work but must hold the appropriate C license to self-perform specialty trade work.

Not authorized: Cannot self-perform specialty trade work (electrical, plumbing, HVAC, etc.) without holding the corresponding C license. Cannot contract for C-16 Fire Protection or C-57 Well Drilling without the appropriate license or subcontractor.

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

Installs, services, and repairs power boiler installations, hot-water heating systems and steam fitting, including fire-tube and water-tube boilers, piping, fittings, valves, gauges, pumps, radiators, fuel oil tanks, chimneys, flues, and associated solar heating equipment.

Not authorized: Does not include warm-air heating or air conditioning systems (see C-20).

C-8: Concrete Contractor

Forms, pours, places, finishes, and installs specified mass, pavement, flat and other concrete work, and places and sets screeds for pavements or flatwork.

Not authorized: Does not include application of plaster coatings or placing and erecting steel reinforcing bars.

C-10: Electrical Contractor

Places, installs, erects, or connects electrical wires, fixtures, appliances, apparatus, raceways, conduits, solar photovoltaic cells, or any part thereof which generate, transmit, transform, or utilize electrical energy.

Not authorized: Electricians working under a C-10 must be certified per CA Labor Code.

C-11: Elevator Contractor

Fabricates, erects, installs, and repairs elevators including sheave beams, motors, cable and wire rope, guides, cab, counter weights, doors, controls, and signal systems for electrical, hydraulic, and manually operated elevators.

C-16: Fire Protection Contractor

Lays out, fabricates, and installs all types of fire protection systems including all associated equipment.

Not authorized: Does not include electrical alarm systems.

C-20: Warm-Air Heating, Ventilating and Air-Conditioning (HVAC) Contractor

Fabricates, installs, maintains, services, and repairs warm-air heating systems and water heating heat pumps, ventilating systems, air-conditioning systems, and the ducts, registers, flues, humidity and thermostatic controls and air filters in connection with these systems. Includes solar-powered HVAC systems.

Not authorized: Does not include boiler or steam heating (see C-4) or refrigeration below 50F (see C-38).

C-36: Plumbing Contractor

Provides means for a supply of safe water and proper disposal of fluid waste, including piping, storage tanks, venting, gas appliances and connections, water and gas piping, water heating equipment including solar, and health and safety devices such as backflow preventers and gas earthquake valves.

Not authorized: Does not include forced warm-air units (see C-20).

C-51: Structural Steel Contractor

Fabricates and erects structural steel shapes and plates used as structural members for buildings and structures, including riveting, welding, rigging, and metal roofing systems.

D21: Machinery and Pumps

Installs, maintains, and repairs machinery and pumps.

D28: Doors, Gates and Activating Devices

Installs, maintains, and repairs doors, gates, and their activating devices including automatic openers.