This article aims to contribute to the social science discussion on urban policies and the integration (or exclusion) of the perspectives of marginalized groups by asking the question: If there were to be exhaustive urban planning relating to drug issues, what role should drug users play in the planning process? Our answer involves the use of a set of two complementary qualitative cartographic methods which allow us to focus on the inclusion of the voices of marginalized groups. This article is based on methodological experimentation in different French and German cities without aiming at a comparison. The article exposes and discusses firstly an individual interview method called ‘Emotional Mapping’, and secondly a participatory mapping workshop called ‘Ideal City Mapping’. The output of this project has been a web of visual and textual documents, in the form of reports, papers, articles and events such as a travelling exhibition, with the aim of engaging in public discussions with various key players.