Collaborations and partnerships between supplying parties are of great importance for adopting circular principles in the built environment and should be investigated within the development of circular supply chain management (CSCM). Therefore, the focus of this research is on collaboration opportunities within CSCM, where the need for active and dynamic actor networks, supply chain learning, future visions and circular business models will be discussed in more detail. During this research I worked together with the Municipality of Rotterdam through an internship. They also found research into collaboration opportunities within CSCM interesting and necessary. Besides, they added that they wondered what the role of the municipality could and should be in supporting (local) circular supply chain collaboration (CSCC) in order to scale up the circular renovation of the private housing stock in Rotterdam. Therefore, the ultimate goal of this research is advising the Municipality of Rotterdam on their position in this innovative process of CSCC. To achieve this goal, this research focusses on the following research question: How could CSCC be facilitated by municipalities to achieve upscaling of circular renovation of Dutch owner-occupied housing? First, an analysis into the state-of-the-art has been carried out, which has looked into the current circular construction and renovation concepts and principles being used in Europe, the Netherlands and the city of Rotterdam. Based on this analysis, the following research variables have been identified, which needed to be further investigated: adoption of innovations, actor networks, supply chain learning, future visions and circular business models. Second, a literature review is given of relevant theories and concepts related to these variables, which has identified the main research indicators that I wanted to use to reflect upon during and after the empirical part of the research (listed in the theoretical framework). Third, a stakeholder analysis has been carried out, consisting of two phases of semi-structured interviews, an (additional) internal survey and a focus group discussion. In the first interview phase, interviews were held with public parties, including municipalities, universities and knowledge institutions. In the second interview phase, interviews were held with private parties and civil organizations, including actors of different (local) market parties, branch organizations within the building sector and interest groups for homeowners. This analysis has resulted in four main barriers of CSCC in which the municipality could exert influence: insufficient internal integration, insufficient communication, insufficient realisation and insufficient facilitation. To find more clarity with regard to the first main barrier, an internal survey was circulated within the municipality, which provided more insights from a broader group of employees from different clusters and departments. The remaining three main barriers have been discussed within a focus group, where I have investigated from a management perspective whether the suggested opportunities in terms of (more) concrete strategies mentioned by different stakeholders, will work or not to solve these identified barriers and mismatches in practice. Fourth, the results of the stakeholder analysis have been compared with literature, examining the importance of obtained solutions for the identified mismatches in more detail. This has resulted in an advisory action plan for the Municipality of Rotterdam, which states that the municipality should act as a director and should focus more on the following main tasks: (1) Internal integration: stimulate and coordinate internal integration between colleagues, visions, ambitions and social challenges of different clusters and departments. (2) Communication: create an open, transparent and accessible local communication network between public and private parties, including the municipality, knowledge institutions, market parties, interest groups for homeowners and residents. (3) Realisation: implement developed circular and modular building and renovation ideas, principles and concepts, starting with designating municipal buildings and public space where the local market is given the opportunity to experiment. (4) Facilitation: offer various municipal (learning) tools to help the local market in the start-up phase, like (online) theme sessions, comprehensive courses and teaching programs/workshops. The full advice is drawn up on the basis of these four main tasks. Practical recommendations are given that could be a positive stimulus for CSCC to achieve upscaling of circular renovation of Dutch owner-occupied housing. These recommendations answer the main research question.