Utrecht University selects contractor for the redevelopment of the SL2 building

Utrecht University has selected contractor Heilijgers and installation companies Verweij and ULC for the redevelopment of SL2. Following a sustainable refurbishment, the building at Sorbonnelaan 2 at Utrecht Science Park will provide space to accommodate the growth of the Faculty of Science and will house several chemistry and physics research groups. The research groups are expected to move into the renovated building in 2028.

Sustainable redevelopment first

SL2 will largely retain its structure and external characteristics. At the same time, significant sustainability measures will be implemented. The building will be re-insulated and fitted with new roofing, window frames and HR++ glazing. Heat recovery will be applied in the air handling system. The building’s connection to the WKO system (aquifer thermal energy storage) will be improved, making the building considerably more energy-efficient. The building will offer over 2,000 m² of laboratory space and a comparable area for offices, as well as meeting and collaboration spaces.

Laboratories designed in 3D

The functionality of the building and the design of the laboratories were central during the design phase of the project. Using a 3D model, all laboratories have been designed in close consultation with future users.

Collaboration and cohesion

SL2 will strengthen collaboration and cohesion between groups currently based in the David de Wied building, the Kruyt building and the Buys Ballot building that will come together in SL2. The building will house several chemistry and physics groups: part of the Material Chemistry & Catalysis (MCC) group from the David de Wied building, Physical Colloid Chemistry (FCC) from the Kruyt building, the Institute for Theoretical Physics (ITF) from the Buys Ballot building, and the Institute for Gravitational and Subatomic Physics (GRASP). MCC and FCC are part of the Debye Institute for Nanomaterials and, following the move, will be located in the same building cluster (SL2 and the Ornstein Laboratory) as the other Debye groups. The relocation of ITF will bring theoretical and experimental physics closer together.

Connection to the Ornstein Laboratory

A new entrance will be created between SL2 and the Ornstein Laboratory on the north side; this will become the main entrance. The outdoor area around the new entrance will also be redesigned, creating an attractive gateway to both buildings.

Planning

Construction is expected to start in the fourth quarter of 2026. The research groups are scheduled to move into the renovated SL2 building in 2028.