The use of brick for the exterior was decided early, though brick is most often used today as cladding and so it was not taken for granted that it would also constitute the bearing shell of the building. That it does so reflects the wish for accord between construction and design.
As a contrast to the darkly massive exterior of the building, the interiors are plastered in light shades and, since the rooms richly vary in form and size the interior materials are relatively few and uniform. The idea has been as far as possible to allow the natural colours of the materials themselves to set the tone of the colour scheme. This becomes apparent as soon as one reaches the foyer on the ground floor where, as elsewhere, the window and door joinery is in oiled cherrywood. Floors, the reception counter and stone details of the walls and columns are of polished Jämtland limestone.