The interior of the church is characterized by clean surfaces, where a barrel vault ascends above the middle section of the nave. The choir section is dominated by a high barrel vault, which is nevertheless lower than that of the nave.

The building committee was preoccupied with the church’s colours and wanted a colour theme – because it was felt “that the atmosphere of the church was to a large extent dependent on the right colour combination”. They arranged for Domenico Erdmann to take on this project for a reasonable fee. His proposal of a strong, dark ochre-coloured exterior initially provoked strong reactions, and this was later painted over, whereas the interior colours have largely been retained in later renovation work. Erdmann’s dark main colours, with lighter, fresh accents, still make a strong contribution to the character of the interior, in spite of the more recent, unpainted wooden panelling. His colours built on strong historical knowledge and they dress the neo-baroque forms well. Erdmann was the colour consultant to the Ministry of Church Affairs and carried out the restoration of many churches and protected buildings in association with the Directorate for Cultural Heritage during the period between the wars.

Bishop Berggrav was satisfied when he consecrated the church in 1933 and expressed this with some well-chosen words: “Sandtorg Church has become very beautiful. Architect Bjørhovde deserves credit for his work, transforming the old, ugly chapel into a House of God. He really has succeeded in fashioning a silk purse out of a sow’s ear.”