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Introduction: With the goal of testing the health impact assessment process to promote health in its policies, the City of Limoges selected the urban planning project aiming to reconvert the Marceau barracks for this experiment. The aim of this HIA was to consider the potential impacts on health of the developed pre-project. The stages of screening, scoping, impact assessment and recommendations took place between 2017 and the end of 2019. Purpose of research: To describe the methods and the different stages of an HIA based on a concrete example, in order to share an experience of an HIA and to relate the issues and difficulties encountered. Methods: An evaluation team was set up to carry out the HIA coordinated by the Regional Health Observatory of Nouvelle-Aquitaine (ORS NA) and the City of Limoges. The team followed the recommendations from the international guides while adapting the principles to specific timing issues and the overall context. Results: The HIA led to the identification of 121 potential impacts and 54 recommendations. The presence of a multidisciplinary team was a strong asset throughout the whole process, while the timing of the HIA and the participation of the population were the two aspects that required the most flexibility. Conclusions: The HIA has enabled a concerted and intersectoral effort on health issues through an urban planning project. While the time-consuming aspect of the process was noted, the need for a more systematic integration of health issues into urban projects with HIA was emphasized.