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A general engineering contractor is a specialized contractor primarily engaged in the construction of various fixed works that demand specialized engineering knowledge and skills. These projects encompass a wide range of infrastructure and industrial undertakings, including but not limited to irrigation, transportation systems (railroads, highways, etc.), utility plants (powerhouses, refineries), environmental projects (sewage systems, waste reduction plants), and various other engineering-intensive endeavors. In essence, their expertise is essential for executing complex projects involving civil, structural, and industrial engineering aspects.

A general building contractor primarily focuses on constructing, supervising, or overseeing structures designed for the support and protection of people, animals, property, or possessions. These projects involve the use of at least two distinct building trades or crafts. In essence, general building contractors manage or participate in the construction of a variety of buildings, from residential homes to commercial structures, and ensure that the necessary construction expertise is applied to achieve their completion.

A swimming pool contractor specializes in the construction of swimming pools, spas, and hot tubs. Their expertise includes the installation of solar heating equipment as well as all the necessary skills and trades required for these specific types of projects. These professionals are responsible for creating and installing aquatic features, ensuring their proper functioning and incorporating solar heating systems for energy efficiency.

A warm-air heating, ventilating, and air-conditioning contractor specializes in the construction, installation, maintenance, repair, and servicing of heating systems, including heat pumps and appliances; ventilation systems with blowers and plenum chambers; and air-conditioning systems that encompass units, ducts, registers, flues, controls, and air filters. This category also covers systems that incorporate solar energy for heating, ventilation, and air-conditioning. Essentially, these contractors are experts in creating and managing climate control systems within structures.

Hazardous Substance Removal Certification

Business & Professions Code Division 3, Chapter 9.

Contractors, Article 4. Classifications