In line with the funding provided by the Federal Government and the State of North Rhine-Westphalia for the construction of the museum, DOMiD, as the project client, set a budget framework of €44.26 million for the Europe-wide tendering process for the museum's architecture and exhibition design.
During the negotiations over the leasehold contract (2020–2025), construction costs in Germany rose by an unprecedented 50 percent. In addition, the condition of the hall in which the Museum Selma will be housed proved to be worse than originally had to be anticipated, resulting in more extensive refurbishment work.
As of the end of 2025, the planned museum and its original spatial program faced a funding shortfall of about €20 million. This means that the increase in the project's costs was broadly in line with the general rise in construction costs in recent years. Once a contingency allowance and further cost indexation were taken into account, the total funding gap amounted to €33 million. As the funding bodies did not provide additional funding to cover these costs, an alternative solution had to be found.
After carefully weighing all factors, DOMiD, the organisation responsible for the Museum Selma, is pursuing the realisation of the museum at its originally planned site in Cologne-Kalk. By reducing the spatial program and the floor area to approximately 60 percent, the project can remain within the specified budget framework of €44.26 million.