This study presents circular economy interventions implemented in a centenary building in Vienna under the EU-funded HOUSEFUL project, aiming to optimise resource management across building life cycles. The approach integrates technologies for internal reuse of treated rainwater and wastewater, renewable energy generation from biogas, composting linked to urban gardening, and nutrient use in greenhouses. Energy efficiency enhancements include green walls, innovative conservatories, and building-integrated solar thermal and photovoltaic panels, coupled with intensive process monitoring for safety and data collection. Sustainable, upcycled materials and principles of reversibility and deconstructability guide implementation. Co-creation workshops with multiple stakeholders shape service design, supporting replicability and fostering circular transitions in the housing sector.
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