Building construction and repair; Construction of civil engineering structures; Installation, maintenance and repair of air-conditioning apparatus; Installation, maintenance and repair of electrical systems and appliances; Installation, maintenance and repair of fire service system; Installation, maintenance and repair of water distribution systems, water treatment systems and irrigation systems; Installation, maintenance and repair of drainage, environmental control systems and machines, waste liquid disposal systems and water purifying plants; Installation, maintenance and repair of electrical systems and appliances, namely, renewable energy generation equipment; Installation, maintenance, and removal of interior and exterior custom seasonal decorations for others