Atrium Architekti Turns a 1960s Košice Steelworks Dormitory into 507 Micro-Apartments

KOSMALT was built in the 1960s as the largest workers' dormitory of the VSŽ steelworks in Košice, designed by Ladislav Greč and Róbert Kandrík. It is a textbook panelák: a long, 13-storey slab with a strict structural grid, precast concrete panels and rows of identical cells. The name itself is industrial. Kosmalt was a type of enamelled steel made only in this region, so the building carries the steelworks in its title as well as its history. Atrium Architekti, led by Michal Burák, Dušan Burák and Jana Varchola Buráková, has now finished its conversion into 507 private apartments of about 21 m² each.

The interesting part is not that a socialist-era block was saved. Central Europe has thousands of these, and most renovations bury them under insulation and pastel render. Atrium did the opposite. The team treated the panelák as architecture worth reading. They uncovered the terrazzo, marble and steel that later layers had hidden, kept the grey grid on the long facades intact, and set the new work apart in a clearly different material language. The building was never meant to adapt. This project shows that it can, provided you accept its discipline rather than fight it.

The Grid, Left Alone

On the east and west elevations, Atrium kept the precast grid in monochrome grey, and that restraint is the project's first good decision. The recessed balconies read as a uniform field across the slab. Seen through the pines, the building still has the compositional clarity its original architects intended.

Up close, the board-marked panels and their thin joints carry real texture, which a thermal wrap would have erased. The blank end wall stays blank. Nobody tried to add a supergraphic or brighten it. We think that confidence is rarer, and more useful, than any facade gesture.

A New Front Door in Corrugated Metal

The new elements gather at the base. A low, white, corrugated volume and a heavy concrete canopy form the entrance, and in mass and material they are deliberately unlike the slab above. Corrugated sheeting is a cheap, industrial skin. Here it suits a former steelworks hostel better than a polished glass foyer would have.

The courtyard between the low wing and the balcony facade, with its young birches and pink tables, gives residents a place to be outside that is neither street nor balcony. Deep window recesses cut into the corrugated wall frame the old block from inside the new one. It is a small detail, but it makes the dialogue between the two periods explicit.

The Coral Lobby

Inside, colour takes over. A coral steel mezzanine and truss ceiling run above pastel mailbox cabinets, wide stone steps and, in places, exposed brick. The restored steel gallery and staircase are original elements, and painting them a single strong colour makes them read as the structure of the room rather than as heritage props.

The mezzanine has also been turned into usable space, with shelves and bean bags above the mailboxes. A reception desk clad in glass blocks adds a period-appropriate material that is still clearly new. In a building of 507 small units, the lobby has to work as a shared living room, and this one is generous enough to do that.

Copper Mesh Overhead

Expanded metal is the project's main tool for new ceilings. Copper-toned mesh with integrated linear and circular lights runs through the entrance passage and residential corridors, hiding services without pretending the concrete is anything other than concrete. Where the mesh meets a white wall and raw panel, the junction stays visible and honest.

The copper tone is a fair nod to the metallurgical history behind the Kosmalt name. More practically, a perforated ceiling gives long, low corridors some depth and glow, which painted plaster would not.

Terrazzo and Raw Concrete Stairs

The stairwells show the restoration logic most clearly. Cast terrazzo steps, black steel balusters and a timber handrail sit beside raw concrete walls. These materials were already in the building, hidden under later finishes. Uncovering them cost less in material terms than replacing them, and it gives everyday circulation a quality most new housing at this price point never reaches.

Corridors That Tell You Where You Are

Thirteen floors of near-identical corridors are a wayfinding problem. Atrium answers it with paint: large yellow circles and floor numbers on board-marked concrete, a yellow perforated ceiling, yellow-framed glass doors. The graphics are bold enough to work at a glance and simple enough not to fight the concrete.

The corridors also end in daylight, which matters more than the signage. Shared spaces sit on every floor, and according to the architects they are larger than the apartments and get more light and views. That is the right priority for a building of studios: the private unit stays tight, and the common room is where you get the space.

Twenty-One Square Metres, Done Properly

The team tested several layouts before settling on compact XS apartments of about 21 m², meant for singles or couples. Each is a narrow bay with a kitchen run, salmon-pink cabinetry, a daybed or bed, and a balcony door at the far end that opens onto treetops. The original cell width sets the plan, and the architects have built to it instead of merging units for marketability.

You can question whether 21 m² is enough to live in. The answer depends on the shared floors carrying their weight, and on the balcony, which turns a corridor-shaped room into one with a view. Copper room plates and careful joinery suggest the units were designed with care, not just counted.

Plans and Drawings

The site plan and axonometric show the long slab among low neighbours, with the new entrance volume as the only significant addition to its footprint. The elevation confirms how little the long facade changes. Repeated balcony bays run across every floor, and the low entrance block sits at the base.

The typical floor plan is the key drawing. Narrow rooms line both sides of a central stair and lift core, a dormitory logic that carries straight over into housing. The unit plans, each 3,000 by 7,000 millimetres, show how a bathroom pod, kitchenette and bed fit into the original cell. The cutaway axonometric makes clear that the grid, not the architects, sets the rules.

Why This Project Matters

Panelák blocks house a large share of people in Slovakia and across the former Eastern Bloc. Too often they are treated as a liability to be insulated, rendered and forgotten. KOSMALT argues that the original buildings had material quality and compositional intent, and that both can be recovered. The terrazzo, steel and precast grid were always there. Atrium Architekti had the patience to find them and the discipline to leave them visible.

The project also offers a clear model for adding new work. Keep new and old visibly distinct, put the boldest moves at the base and in the shared spaces, and let the structural grid decide the unit. The result is 507 small, affordable homes inside a building that still reads as itself. That is a stronger case for reuse than any demolition-and-replace scheme in the city could make.

KOSMALT Housing Renovation by Atrium Architekti (Michal Burák, Dušan Burák, Jana Varchola Buráková), Košice - mestská časť Západ, Slovakia. Original building by Ladislav Greč and Róbert Kandrík. Area: 15,625 m². Completed: 2025. Photography: Matej Hakár.

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