The stairs are one of the most important design elements in the showroom and have a filigree steel structure. The visual appearance of the stairs is clearly underlined by the tread coverings and railings. Essential staircases (fire escapes) are accommodated in separate stairwells and are made of concrete. 

The surfaces of internal walls and columns are finished differently depending on their location and function. Colors are used to create a signal effect and to make individual areas easily identifiable.

Doors in internal walls
The doors in the showroom contrast clearly with the wall areas. The doors in the workshop are not emphasized.

The characteristic floor design is created with light and mid-gray matte color shades with glossy or dark-gray color accents. There is a choice of tiles or a homogenous floor covering with a road-like appearance. Customer access areas are visually distinguished from working areas by the change in the flooring material to wood and textiles. The clinker workshop floor is extremely functional and hardwearing. The floor in the store consists of gray screed or concrete.