Utrecht University Museum manages the university’s academic heritage. The museum makes visible the importance of science to the general public. The original building from 1996 was designed by Koen van Velsen and was intended to serve 25,000 visitors per year. In 2021, with 80,000 visitors, it has reached its physical limitations. The goal was therefore to expand the museum with more facilities, more exhibition space and better visibility between the museum, the street and the botanical gardens behind it. The exhibition area has been increased by transforming the former office wing to the rear. The museum rooms on the ground floor in the wooden box have been converted into a larger reception area. This has created more space for facilities such as the reception, cloakroom and museum shop. The ground floor has been made more open to the street and the botanical garden. A limited extension with a lift has been realized at the junction between the two wings of the museum, so that the main staircase becomes an optimal link and the museum routing between the main volumes is clearer. The extension was designed as a contemporary layer on the garden side of the building, making the museum ready for sustainable growth in the future through strategic interventions.