Already in the founding years of the museum in the 1970s, there were plans for a building that would include the cash desk, an exhibition area, and group rooms. The main entrance was planned near the Paderborn village. For the transition, a ticket booth was set up at the Krummes Haus. Later, a shop and a container were added.

These temporary solutions remained in place for many years without another entrance situation being implemented. However, the need for an entrance and exhibition building remained. Following a feasibility study in 2018, an international architectural competition took place, which was won by the architectural firm ACMS from Wuppertal. The new entrance and exhibition building, with a usable area of 3,100 square metres, will for the first time offer the opportunity to present large special exhibitions and thus special depot treasures.