A property preservation general contractor usually is responsible for the supplying of all material, labor, equipment, engineering vehicles and tools and services necessary for the construction of the project. So the CSLB issues licenses for the following classifications:
First the Class A General Engineering Contractor. The principal business is in connection with fixed works requiring specialized engineering knowledge and skill.
Second Class B General Building Contractor. The principal business is in connection with structures that shelter and enclose persons, animals, chattels, or movable property requiring in their construction more than two unrelated trades. So the "B" contractor may contract any single or multiple trade or craft without the additional "C" specialty license.
Third Class C Specialty Contractor. There are 40 separate "C" license classifications for contractors whose construction work requires special skill and whose principal contracting business involves the use of specialized building trades or crafts. So manufacturers are considered to be contractors if engaged in on-site construction, alteration, or repair.