Dennis Sommer // Add-On - Extension of the University Bonn



The building responds to the task of integrating a seminar building into the historic structure of the former Electoral Palace with a balance between respect for and adaptation to the existing structure on the one hand, and an honest approach to modern materials and the new building's own function on the other. The building clearly approaches the Electoral Palace, which is a defining feature of the district. In terms of urban planning, the gap created by the removal of the former orangery on the building site is closed. However, the current permeability from the city garden to the street is maintained, both functionally and visually through the glass façade on both sides of the seminar rooms. The building references the existing building primarily by taking up the building lines, as well as a façade grid with similar proportions. Like the palace, which originally stood on the edge of the city and merged with the open landscape, the building faces the Rhine and Siebengebirge mountains to the south. A heated core room is inserted into a shelf of reinforced concrete, which can be divided into two smaller seminar rooms by a partition wall. The splendor of the castle is now contrasted with a building characterized by extreme simplicity. Materials are left raw and heated and enclosed spaces are reduced to the bare essentials. In addition to an improved environmental balance due to the low heating requirements, this frugality makes it possible to create generous public spaces in the seminar building. The technical equipment follows this principle of simplicity. For example, the surrounding balcony also serves as a fixed sunshade that prevents the seminar rooms, which are open to the south, from overheating in summer, but also generates solar yields when the sun is low. In addition to mechanical ventilation, the seminar rooms also provide free window ventilation with the possibility of cross-ventilation. Simple radiators are added for heating and interior curtains allow the rooms to be darkened. The rain-protected exterior surfaces create a connection to the city garden and invite themselves to be appropriated by the users, whether as a place to stay before lectures