Plennes is a general contracting company that serves industrial business customers in Milwaukee. Founded in 1952, it offers a range of design and build services. The company also operates an in-house engineering department and serves clients in the commercial sector. Plennes clients include Goede Trucking, Great Northern Corp, Supreme Meats, Dana Corporation, Elmbrook Schools, Tower Automotive Company, Silgan Container Corporation and Doc's Jewelry. In addition, it has undertaken projects for Ten Color Press and Slag Line Conveyor. The company provides construction management and engineering solutions. Plennes also specializes in planning and feasibility studies. It offers services to Key Products and Cooper Power Systems.