Mapping Stakeholder Information Needs to Enhance Energy Efficiency, Circularity, and Sustainability in the Built Environment

Achieving more sustainable and circular practices in the construction sector requires a clear understanding of the information needs of the stakeholders involved throughout the building lifecycle. This study investigates the data requirements, roles, and decision-making needs of key actors in the European construction sector, including architects, engineers, contractors, energy consultants, regulators, facility managers, and material suppliers. The research adopts a mixedmethod approach combining an online survey and targeted interviews. The survey, distributed across Europe through professional networks and social media channels, collected 101 responses from construction-sector stakeholders. In addition, 13 semi-structured interviews have been conducted to deepen the understanding of stakeholder perspectives and contextualize survey results. The collected data have been analyzed through data-mining techniques and visualized through graphical representations to identify patterns in information needs, preferred data formats, and decision-support requirements. The results highlight differences among stakeholder groups in terms of required information types, levels of technical detail, and preferred delivery formats. These findings support the development of structured information workflows that better align data provision with stakeholder responsibilities and decision-making processes. By clarifying stakeholder information requirements, the study contributes to improving data management practices and supporting the implementation of sustainable and circular strategies in the built environment.