In 1955, architects Viatgé and Castaing completed the Departmental Archives of Haute-Garonne, which were awarded the Remarkable Contemporary Architecture label in 2017. However, the facility now requires restructuring and an extension in order to meet the functional needs and the current and future expectations of the local authority. While respecting the historic building, conservation standards, and environmental challenges, the agency has designed a project that reinforces the architectural unity of the complex.
From the original entrance, visitors are guided toward the various public spaces of the Departmental Archives of Haute-Garonne. Designed as a large flexible and reconfigurable space, the ground floor can host a variety of events: exhibitions, screenings, group visits, and conferences.
By concentrating the new archive silos, administrative offices, the reading room, and exhibition spaces within the extension, the agency proposes an architecture that connects functions that were previously separated. The new building and the existing one operate as a single entity. The unity of the Departmental Archives of Haute-Garonne is reinforced by the creation of a new façade that engages in dialogue—through its proportions and rhythm—with those of the historic buildings. Beyond its visual coherence, its structure, composed of concrete frame façades, offers numerous advantages. Thanks to variations in the rhythm of the structural grid, the ground floor allows public and exhibition spaces to open onto the city, while on the upper floors it regulates solar exposure in the offices. Its implementation and installation—on an occupied site—are facilitated by the prefabrication of the elements.
The building, designed with a focus on simplicity and restraint, is compact. As a result, the surface area of the envelope is reduced, and a double-wall system ensures optimal climate security for the archives. In the spaces dedicated to the public and staff, a solar thermal chimney ventilation system reduces overheating and limits energy consumption.