Floating Sauna in Oslo by Estudio Herreros

Two years after the opening of the Munch Museum by Estudio Herreros, the Spanish firm has completed another structure in the immediate vicinity. On a much smaller scale, however, the floating sauna called Trosten in the Oslo Fjord is in the tradition of the architectural follies of English landscape gardens. With its striking colour scheme – turquoise green facade and red steps on the roof – It stands out from its surroundings. Despite its expressiveness, it is intended to serve its users as a place of retreat and contemplation.

The sauna cabin has direct access to the water. © Einar Aslaksen

The building is part of a group of floating saunas at the mouth of the river Akerselva, designed by different architects. What they all have in common is the transition between land and water. At the same time, they are part of the newly designed 7 km long harbour promenade with walking, jogging and cycling paths, which was created after the conversion of the former container port. The layout of the new sauna can be divided into two areas: a sauna cabin with direct access to the water and an amphitheatre in the form of an open staircase with a view of the fjord. The latter can also be used for events.

The sauna is part of the newly designed harbour promenade. © Einar Aslaksen

During construction, the architects focused on sustainable design, including the use of natural and recycled materials. The substructure of certified timber was prefabricated and placed on a floating concrete platform. The recycled aluminium facade and interior finishes were then installed. For the latter, large red terrazzo panels were used for the floor, walls and open staircase, giving the building its thermal inertia. In line with the client's brief to 'bring the sauna to the people', the building also embraces the theme of inclusion. For example, it has a steam circulation system that allows wheelchair users to use the cabin. The idea of exchange is also reflected in the sauna's name: Trosten is the Norwegian word for thrush, a migratory bird that flies between Spain and the Nordic countries every year.