The port of Scheveningen has undergone far-reaching changes in recent years. A myriad of new homes have been added to this part of The Hague. For an apartment in the “De Reder” complex we have been asked to design a roof extension, providing the ultimate harbour experience. We designed a simple volume housing a home-office, sitting room and a fitness room with an attached bathroom. Large sliding doors open this space to the adjacent terrace, giving a feeling of openness and freedom. The materials chosen for the structure refer, on the one hand, to the post-industrial character of the harbour and, on the other, to the temporary cabins situated on the nearby beach.