At Økern in Oslo, the sports club Hasle / Løren IL have their facilities. One of their main branches is ice hockey. In the future the club has confirmed that they will build a new arena for this sport. The proposal consists of two nearly identical ice hockey arenas. And the building has a footprint of about 11000 square meters. This large program is in an urban environment under great development. The building consists of 3 floors. It has a base that spans 2 floors. The structural walls are of concrete. The grandstand is precast concrete elements. The floor slab and the columns futher up in the structure are also made of the same material. The walls and columns have a centre distance of 7m. The roof construction is a steel structure. It has beams in the direction with the shortest span, which is 50 m. The second direction there are modules that are welded on the beams. The construction has a height of 3m. And consists of H beams and 25cm square steel tube. The entire construction rests on concrete beams with a cross section of 50cm.