This paper presents an integrated approach that combines ‘Sustainable Building Design’ tools and ‘Sustainable Manufacturing Process’ tools to create a tool for the design of sustainable manufacturing systems.’ Currently no such integrated tools are in use by manufacturers to assess energy performance, identify improvement areas and help suggest actions. This paper describes the development of a tool that through such integrated modelling can help identify improvements via its library of tactics. These sustainable manufacturing tactics have to account for location and time, as well as production process, in a manner that is not currently supported by either manufacturing process simulation tools, or building energy tools. Through case study applications, the integrated modelling of real world industrial processes is demonstrated, from target and boundary settings, mapping (manufacturing process systems, material flow, surrounding buildings and facilities), data collection, simulation, improvement opportunities and optimisation.