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 Zhejiang Huahang Insulation Products Co., Ltd.,Tianjin Ecoin Tech Co., Ltd,CHENGDU PROPANEL TECH CO., LTD,Nanjing Zhongrunda New Material Technology Co., Ltd.,Myreal Energy Saving (Shanghai) Co., Ltd. via the red button for more infomation.