Kosmalt was originally the largest workers’ dormitory of the Košice steelworks VSŽ, built in the 1960s to a design by Slovak architects Ladislav Greč and Róbert Kandrík. Constructed as a panelák, a type of prefabricated concrete-panel building still found throughout the former Czechoslovakia and elsewhere, the building takes its name from a type of enamelled steel whose production was characteristic of the local steelworks. Located in the Terasa housing estate in Košice, Slovakia, Kosmalt's distinctive silhouette and characteristic facade form a dominant feature within the urban structure.
From workers’ dormitory to contemporary housing
Originally, the building served as a socialist dormitory — a type of accommodation intended for single workers that provided basic facilities as well as social supervision. Today, the same building occupies a very different social context, offering individual and contemporary forms of housing. The transformation of Kosmalt demonstrates how architecture can adapt to changing needs and the life cycles of those who inhabit it.
Atrium Architekti’s comprehensive renovation of the exterior and interior sought to preserve the building’s identity, rehabilitate its original qualities, and adapt it to contemporary housing requirements. The approach is based on the premise that even typologically utilitarian buildings from the second half of the twentieth century can, through sensitive transformation, provide attractive urban housing.
Restoring the facade grid
The thirteen-storey building is defined by a strict structural and spatial grid that also determines the form of its exterior. A geometric facade of prefabricated concrete modules gives the building its distinctive expression. The modular eastern and western facades, each formed by a grid of 22 × 13 identical fields, became a central motif of the renovation.
The reconstruction respects and develops this underlying principle, reinforcing the grid as one of the building’s strongest architectural elements. A monochromatic grey finish further emphasises the clarity and monumentality of the composition.
Revealing the original fabric
An important part of the design involved uncovering and restoring valuable materials and details that had been concealed beneath later interventions. Cast terrazzo in the common corridors and staircases, marble cladding in the vestibule, the travertine facade plinth, steel beams in the common areas, and the steel gallery and staircase in the entrance hall were all preserved and refurbished.
New interventions are expressed through a contemporary material language of expanded metal and corrugated sheet metal, together with custom-designed lighting and strong colour accents. Existing and new elements remain clearly distinguishable while forming a coherent architectural whole.
Compact homes and shared spaces
The building retains its residential function, with the new layout working within the logic of the existing structure. A central challenge was transforming the original identical residential cells into private units meeting contemporary housing standards. Analyses during the design phase established that compact XS layouts of 21 square metres could accommodate both individuals and couples. Generous glazing, loggias, and views across the city, particularly from the upper floors, help create a greater sense of space. In total, Kosmalt contains 507 residential units.
In contrast to the compact apartments, the entrance areas, corridors, and vertical circulation are more expansive. Natural light, outward views, and their generous proportions allow these spaces to function as shared social areas across the thirteen floors. Two identical, symmetrically positioned staircases continue to divide the building into two halves, reflecting its original organisation into male and female accommodation.
A new wayfinding system uses colour and symbols to make this large-scale arrangement easier to navigate. Salmon, ivory, and yellow, together with plus and minus signs, distinguish the individual corridor wings and provide an intuitive means of orientation.
Adaptability through renovation
Kosmalt was not originally conceived as an adaptable building, yet the renovation introduces this quality within the constraints of the existing structure. The project demonstrates an approach that remains relatively uncommon in the local context: treating the renovation of a prefabricated panel building as a fully fledged architectural strategy.
