When a green factory is constructed on a new site, this is referred to as a “green greenfield project.” With these projects, the business enjoys all freedoms when designing the factory structure, when fitting out the building, and with the production processes. In practice, however, it is more common to upgrade existing factories and make them sustainable. These “green brownfield projects” require factory planners to question tried and tested efficiency-raising measures and ways of thinking. It is a continuous improvement process, unlike classic factory planning.