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 Tianyan Holding Co., Ltd.,Lonstar (Shanghai) International Trade Co., Ltd.,Lonstar (Shanghai) International Trade Co., Ltd.,Ningbo Qianxiang Huiya International Trade Co., Ltd.,CHANGZHOU XITA PLASTIC CO., LTD. via the red button for more infomation.