The third stage of the research includes a target building, experimental halls, laboratories, a number of adjoining buildings and installations in several buildings.

Skanska and ESS signed a cooperation agreement during 2014 for the entire construction project and a design contract for the first stage which included ground works, accelerator tunnel and a number of adjoining buildings. The second stage, agreed in 2015, concerned installations in a number of buildings, substations and transformers, ground works including piling, landscape works and concrete works to the target building and experimental halls. With the third stage, all parts are contracted.

Construction work carried out by Skanska is expected to be completed during 2020. The research facility will be ready to receive external researchers during 2023.

ESS, European Spallation Source, is a pan-European state-of-the-art research facility that will be used in a number of research areas such as the environment, medicine, food and materials. The plant is a neutron source where researchers from all over the world will be able to study materials to understand how they work and function.