This article presents a case study of spatial analysis and geodesign in the historical city of Ouro Preto, a cultural heritage site. This study proposes enhancing traditional methods by incorporating georeferenced information, the access to spatial data organized in a Spatial Data Infrastructure (SDI) and the co-creation of proposals to contribute to risk mitigation using the Geodesign method. Geospatial fieldwork data were collected using a Volunteered Geographic Information (VGI) application, compiled into thematic maps and organized on an SDI web-map platform. The maps were organized as main variables related to fire risks and integrated into a Multicriteria Analysis (MCA) to generate a spatial model of risk levels. The complete set of maps was used as a basis for a Geodesign workshop, where participants created and negotiated ideas to address the risks. The collective development of proposals resulted in enhanced citizen awareness and interest in the issue of fire risks.