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Copyright (c) 2026 Magdalena Zabek, Nicolas Pastorelly, Sergio Velasquez, Asier Mediavilla, Vanesa Baño, Thaleia Konstantinou
This work is licensed under a Creative Commons Attribution 4.0 International License.
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Keywords:
Façade retrofit, material database, workflow management, digital services, information management, façade configuratorAbstract
Over 85% of Europe’s existing building stock fails to meet current energy-efficiency standards, underscoring the urgent need for large-scale retrofits. In line with EU climate objectives to accelerate the renovation wave and reduce embodied carbon emissions, façade retrofit offers significant potential to lower operational energy and resource demand, aligning with Circular Economy (CE) principles. However, the implementation of CE strategies is limited by fragmented practices, insufficiently documented product data, and the lack of standardised integration within design workflows.
This research presents a framework that embeds CE-relevant Key Performance Indicators (KPIs) as guidelines for product selection, data structuring, and environmental performance evaluation. The framework links a Material Database (MDB) for structured product data management with a Façade Configurator (FC) as a digital, simulation-based design support tool. The MDB aligns with EU data requirements and extends the Digital Product Passport (DPP) concept by capturing detailed circularity-related information. Environmental impact criteria include Global Warming Potential (GWP), Primary Energy Demand from Non-Renewable Resources (PENRE), Recycling Content (RC), and the use of Renewable Resources (RR). Applied to real-world façade retrofit case studies, the proposed framework enhances early-phase environmental assessment and supports informed, circular design decisions.
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