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Spanish architectural practice Calderon-Folch-Sarsanedas Arquitectes have refurbished an old house built in 1918 in Sarrià, Barcelona. The main object of the project was to improve the thermal and acoustic comforts while maintaining the original volume and facade of the house. Here is a description from the architects, “The challenge was to refurbish a house built in 1918 maintaining both the original volume and façade whilst improving the thermal and acoustic comfort. The construction systems and materials used have made possible not only to achieve the goal but also to lower the energy demand from 171 kWh/m2a to 17 kWh/m2 anual (10 factor rehabilitation). Transforming a traditional existing building into a Passive House.”