Plumbing; Drain and sewer cleaning and rootering services; Drain cleaning services; Electrical contractor services; Electrical repairs, maintenance, and installation of electrical wiring, outlets, light fixtures, and electrical panels; Excavation services; Heating contractor services; HVAC contractor services; Installation and replacement service for heating, ventilating and air conditioning systems; Installation, maintenance and repair of apparatus for generating electricity; Installation, maintenance and repair of heating systems; Installation, maintenance and repair of solar installations for generating power, solar collectors and photovoltaic modules; Installation, maintenance and repair of solar energy systems; Plumbing contractor services; Repair and maintenance of electricity generators; Water main rehabilitation services; General contractor services, namely, plumbing, heating and air conditioning, carpentry, drywall, painting, electrical, building and framing contractor services; Installation and replacement service for water heaters; Installation of electrical and generating machinery; Installation of HVAC systems; Installation of plumbing; Installing septic tanks; Maintenance of plumbing; Maintenance of septic systems; Repair of household appliances and of residential heating, plumbing, air conditioning, and electrical systems