Installation of renewable energy conversion installations; installation of apparatus for generating power; installation of gas and water pipelines; installation, maintenance and repair of apparatus for supplying gas; construction, repair and maintenance of buildings; construction of buildings and other structures; advisory services relating to the construction of buildings and other structures; construction of buildings, roads, bridges and dams; building project management [construction supervision]; construction and maintenance services relating to civil engineering; construction management [supervision]; repair of buildings; demolition work on buildings; installation of building equipments; construction project management (construction supervision) of public water supply or drainage system for others; factory construction; installation of air pollution control facilities; construction of alternative energy generating installations being structures; maintenance of sensors/measuring apparatus; installation of sensors/measuring apparatus; installation of water pollution control facilities; providing information relating to the repair or maintenance of water pollution control equipment; repair or maintenance of water pollution control equipment; installation of apparatus for new energy and regenerative energy production; construction of installation for new energy and regenerative energy production being factories; construction of energy efficient buildings and structures; construction services; repair of wastewater treatment apparatus; installation of wastewater treatment apparatus; installation, maintenance and repair of ventilating apparatus.