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 Lonstar (Shanghai) International Trade Co., Ltd.,Gansu Carela International Trade Co., Ltd,Lonstar (Shanghai) International Trade Co., Ltd.,Shanxi Jingdong Pipe Industry Co., Ltd.,SYI Industrial Co., Ltd. via the red button for more infomation.