CALECHE: A Project to Revolutionize the Renovation of Europe’s Historic Buildings
Historic buildings in Europe, representing about a quarter of the real estate, are much more than remarkable architectural works. They embody living testimonies of historical narratives and cultural identities. These structures carry collective memories and forge concrete links with our history, reinforcing a sense of identity, continuity, and social cohesion. These buildings are not just relics of the past; they actively contribute to the present by providing the community with a sense of belonging and resilience.
The CALECHE project, funded by the European Union under the Horizon Europe program, is set to mark a turning point in the renovation of historic buildings across Europe. CALECHE, an acronym for Coherent Acceptable Low Emission Cultural Heritage Efficient Renovation, is an ambitious initiative aimed at redefining how we preserve and renovate our built heritage while incorporating modern sustainability practices.
Launched in October 2023, for a 36-month period, CALECHE is more than just a project; it is a collaborative network of European partners comprising universities, research institutions, non-profit organizations, heritage managers, and industry professionals, all united by a common goal: ensuring the preservation of our rich architectural heritage while developing innovative approaches to ensure its long-term sustainability. Its ambition is to rethink how we approach these renovations, seeking to find the right balance between modern energy efficiency requirements and the preservation of the cultural and historical heritage of often iconic buildings.
The CALECHE project will present innovative solutions in various areas, including aesthetically acceptable integration of photovoltaic systems into buildings, advances in insulation materials specifically designed to meet the essential needs of historic buildings in terms of humidity regulation, while promoting resource circularity and reducing the overall carbon footprint. CALECHE will also develop a dedicated method for the conservation and repair of historic windows, crucial elements for preserving architectural heritage. The materials used will favor resource circularity and contribute to reducing the overall carbon footprint, aligning renovations with sustainable practices.
Four Study and Demonstration Sites
The CALECHE project has selected four demonstration sites across Europe to showcase the viability of its innovative approaches to sustainable renovation. These four sites illustrate the diversity of challenges and opportunities associated with sustainable renovation in various historical contexts across Europe.
Donnerska Huus (Sweden), located on the island of Gotland in the historic city of Visby, a UNESCO World Heritage site. This 13th-century building has served various 3
roles throughout history, from a trading company to a telegraph station, and even a post office. In 2012, energy improvements were made, followed by ongoing facade, window, and roof renovations since 2020. Preserving its historical character while integrating modern energy solutions is a significant challenge.
La Chaux-de-Fonds (Switzerland), planned in the early 19th century after several dramatic fires, this city is a UNESCO World Heritage site. Its open and parallel grid pattern, intertwining homes and workshops, reflects the needs of the watchmaking industry dating back to the 17th century, which continues today. These protected areas present challenges for renovation.
Villa Matarazzo (Italy) – This villa is located near the city of Ercolano (and its historic site of Herculaneum) and is part of the broader territorial system of Vesuvian villas, although later than other villas in the region. The building is surrounded by a vast 5-hectare park, including a dependency, a farmhouse, and an ornamental garden. Currently, the villa faces severe decomposition issues, including infiltrations, plaster deterioration, missing cornices, and damaged or missing windows.
The Former Museum-Library of Grenoble (France) is a monumental building from the late 19th century. Through its architecture and its location in the heart of the city, this building embodies the archetype of monuments erected to celebrate post-revolutionary ideals, reflecting a period of development and prosperity. The building requires a complete renovation.
The CALECHE project pays special attention to the social acceptability of its interventions, recognizing the importance of community engagement in preserving architectural heritage. By integrating feedback from local residents and stakeholders, special efforts will be made to address the needs and values of the affected communities, thereby strengthening their support and adherence to the projects.
