Without a doubt, whether the metric is net margin or balance sheet, the most profitable construction companies are full service type, providing“design, engineering, project management, construction and procurement” in the heavy industrial and civil sectors. You can contact Shijiazhuang Chuanlin Machinery Manufacturing Co., Ltd,HEBEI GIONLEE MACHINERY EQUIPMENT SALES CO., LTD.,HEBEI GIONLEE MACHINERY EQUIPMENT SALES CO., LTD.,Hebei Decai Metal Products Co., Ltd.,Qingdao Lkd Metal Fabrication Co., Ltd. via the red button for more infomation.