Knickelbein Builders

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-2: Insulation and Acoustical Contractor

Installs insulating media and preformed architectural acoustical materials for temperature and sound control, including batt, blown, rigid board, spray-applied, and acoustical tile or panel systems.

Not authorized: Does not authorize removal of asbestos-containing materials.

C-6: Cabinet, Millwork and Finish Carpentry Contractor

Makes and installs cabinets, cases, sashes, doors, trims, non-bearing partitions, and other finish carpentry by cutting, surfacing, joining, gluing, and fabricating wood or other products.

Not authorized: Does not include framing or rough carpentry (see C-5).

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-9: Drywall Contractor

Lays out and installs gypsum wall board and assemblies, including nonstructural metal framing members, and performs taping and texturing operations to produce a continuous smooth or textured surface.

Not authorized: Does not include lathing and plastering (see C-35).

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-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-23: Ornamental Metal Contractor

Assembles, casts, cuts, shapes, forges, welds, fabricates, and installs brass, bronze, copper, cast iron, wrought iron, stainless steel, and other metals for architectural treatment and ornamental decoration of structures.

Not authorized: Does not include the work of a sheet metal contractor (see C-43).

C-29: Masonry Contractor

Installs concrete units, clay products, concrete and glass block, natural and manufactured stone, terra cotta, and fire brick for structural and non-structural walls, fences, paving, ceramic veneer, and thin brick facing.

C-33: Painting and Decorating Contractor

Prepares surfaces by scraping, sandblasting, or other means and applies paints, papers, textures, fabrics, pigments, oils, varnishes, shellacs, stains, waxes, adhesives, and other coatings for decorating, protecting, fireproofing, and waterproofing.

C-35: Lathing and Plastering Contractor

Coats surfaces with mixtures of sand, gypsum plaster, lime and water, or cement and water, applied by trowel or spray for soundproofing and fireproofing. Installs lath, metal studs, and support materials for plaster coatings.

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.

C-54: Ceramic and Mosaic Tile Contractor

Prepares surfaces and installs glazed wall, ceramic, mosaic, quarry, paver, faience, glass mosaic, and stone tiles; thin tile resembling full brick; and natural or simulated stone slabs for bathtubs, showers, and horizontal surfaces.

Not authorized: Does not include hollow or structural partition tile.

C-60: Welding Contractor

Causes metal to become permanently attached, joined, and fabricated by the use of gases and electrical energy creating sufficient heat.

D06: Concrete Related Services

Installs reusable steel concrete form sections or interlocking precast pavers; performs post-tensioning, concrete sawing, breaking, curing, floor grinding, concrete restoration, and concrete pumping services.

D16: Hardware, Locks and Safes

Installs, maintains, and repairs hardware, locks, and safes in construction settings.

D28: Doors, Gates and Activating Devices

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

D62: Air and Water Balancing

Performs air and water balancing for HVAC and plumbing systems.

D65: Weatherization and Energy Conservation

Performs weatherization and energy conservation work on structures.