YIT is the lead building contractor and Normek Oy is the subcontractor responsible for the steel structures. SSAB supplied Normek with the steel used in the frame structures. Normek then welded the steel arches from these strips and cuttings with numerous passes to create an artistic result that resembles a large lattice structure. In the final stage of construction, the steel frame will be hidden under wood cladding. The library will have a façade of wood and glass.

Designed by Helsinki architect firm ALA Oy, Helsinki Central Library is scheduled for completion in late 2018. When completed, this three-story building will be a public space for people to meet and spend time. In addition to an extensive range of books, the library will also feature a film theater, extensive recreation, work and exhibition premises and even a sauna section.