Sustainable urban planning is becoming more and more important. Ecological sustainability holds greats opportunities for urban areas in order to avoid some of the consequences climate change might cause. In sustainable planning Grönytefaktorn (The Biotope Area Factor) is one important tool and one which Malmö Stad has used in order to increase sustainable planning in the city. Since the beginning of 2015, municipalities in Sweden are no longer required to use The Biotope Area Factor, which might threaten the development of e.g. green roofs. The aim of this study is to investigate how real estate companies experience their role as investors in sustainable planning. Planning is a political activity with multiple stakeholders and in order to try to understand the difficulties sustainable solutions face in this context, Planning theory and Theory of Planned Behavior have been used. The results show that the companies are not willing to invest in sustainable solutions like green roofs, unless the market demands it.