This thesis investigates how and why conflict and tension can arise in a co-creative process, where a municipality and citizens collaborate in a partnership. The research approach is a single case-study of an urban renewal project in Jungshoved, Vordingborg Municipality, where tension and conflict was present. It is argued that this is a critical case using Bent Flyvbjerg’s approach to case-study research. The data used consists of two interviews with a representative from the municipality and three members of the local council of Jungshoved. Using those interviews the experiences of the two parts of the partnership is explored in order to understand the reasons for conflict and how they could have been mitigated. Theory on social sustainability, citizen participation and co-creation is used to form the theoretical framework for the discussion, where the equality of the partnership and the level of influence held by the citizens is assessed. This thesis finds that unclear communication and definition of boundaries for the co-creative aspects of the process has been the central reason for tension and conflict. Furthermore, it points to organizational factors that might limit the municipality’s ability to facilitate co-creative processes.