Ark-Shelter and Archekta’s 20 m² off-grid retreat at the edge of the Zlatý Roh vineyards above Devín Castle compresses full domestic function into a single modular volume, operating year-round without connection to mains services while opening almost entirely to the surrounding landscape.

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Ark-Shelter and Archekta have completed a compact off-grid cabin set within the Zlatý Roh vineyards above Devín, Bratislava, approximately three kilometres from the ECK restaurant. Occupying just 20 square metres on elevated ground overlooking Devín Castle, the structure is positioned to capture uninterrupted views across the vines towards the Austrian Alps. Conceived as a fully autonomous weekend retreat, the brief – and €180,000 budget – called for a building capable of year-round occupation within a tightly constrained footprint, demanding a highly efficient and carefully orchestrated spatial strategy.

Two sides of the cabin are lined with fold-down terraces that, when lowered, reveal sliding glazed walls behind. The principal elevation is fully glazed to its full height, with integrated shading. Together, these elements dissolve the enclosure, extending the interior outwards and significantly increasing the perceived and usable area. Daily life is organised around this threshold condition, where inside and outside converge to form the primary living space rather than a simple point of transition.

Inside, the plan is arranged as a simple, linear sequence behind the main façade. A compact living area sits directly off the glazing, followed by a kitchenette and a bathroom with shower. A cast concrete sink is set within a window opening, oriented towards the surrounding tree line, while above, a concealed sleeping loft is accessed via a retractable ladder integrated into the joinery. During the day, the loft is hidden within the upper volume; a pendant light, when pulled, lifts to reveal the sleeping platform. In contrast to the openness below, the upper level is enclosed on all sides, lit by a single skylight.

The cabin’s off-grid energy system combines photovoltaic panels with battery storage and a gas-powered backup. Hybrid appliances automatically switch between electricity and gas depending on charge levels, prioritising electrical supply for lighting and low-energy devices while allowing more demanding functions, such as heating and cooling, to draw from either source as required.

Water is stored within a reservoir integrated into the raised floor, alongside a separate wastewater tank, while environmental control is achieved through a combination of passive and active measures: intelligent shading and cross-ventilation mitigate summer overheating, drawing cooler air from beneath the structure and expelling warm air through a heat recovery unit beneath the skylight. In winter, the same system operates bidirectionally, with CO₂ and humidity sensors maintaining stable internal conditions.

The primary structure is formed from spruce timber, with interior linings and built-in furniture finished in bio-based wood panels. The exterior is clad in ayous wood, while floors and the bespoke sink are cast in concrete, with the kitchen worktop being finished in a cement skim coat.

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