Objectives: Overweight and obesity among school-aged children pose a threat to both their academic performance and public health. The Healthy Primary School of the Future (HPSF) initiative was established to address this issue. Our objective was to explore the conditions that make HPSF sustainable based on the perspectives of relevant stakeholders. Design: The study utilised Group Concept Mapping, a structured methodology for conducting mixed-methods participative research, combining qualitative data collection with quantitative data analysis measures. Method: Participants included parents, teachers, school directors, politicians, labour unions, educational, nutrition and health scientists and policymakers. They were asked to respond to the prompt, 'A necessary condition to make the HPSF sustainable is . . .'. The statements generated were then assessed for their importance and feasibility. Using multidimensional scaling and hierarchical cluster analyses, we identified the shared vision among the stakeholders. Results: A total of 106 unique statements were generated and grouped statistically into 10 clusters. The most significant clusters were identified as Financing; Accessibility for everyone; and Content/Lifestyle/School Programme. The clusters that were deemed most feasible included Content/Lifestyle/School Programme; Accessibility for everyone; and Evaluation. Conclusion: Achieving sustainability for the HPSF requires a comprehensive approach that addresses the conditions outlined in all 10 clusters. Based on the ratings of feasibility and importance, our recommendation is to prioritise implementation of Content/Lifestyle/School Programme and Accessibility for everyone. Subsequently, efforts should be directed towards realising the less feasible but crucial conditions, such as Financing and Evaluation, followed by the remaining six clusters of conditions as identified.