Horizon House – an nZEB Sanctuary in Cyclades
Onus Architecture Studio

WINNER UNBUILT & CONCEPTS | Houses

Project Description

Horizon House embodies regenerative architecture restoring its ecosystem Native plantings stabilize soil prevent erosion and create habitats for insects and birds enhancing Cycladic biodiversity with ecosystem researchers A 300 m² planted Blue Roof with low water demand species retains 200 m³ of rainwater annually while landscape restoration fosters a resilient microclimate Biophilic design including atrium green roof natural materials and indoor outdoor transitions enhances wellbeing and strengthens occupant nature connection Designed for full off grid independence it harnesses Aegean winds via five FXmicro turbines.

Project Concept

Built on a slope overlooking the Aegean, the off-grid Horizon House weaves a dialogue between nature and human intervention. The Net Zero Energy Emissions building “sinks” into the ground, following the natural contour of the terrain. The stone façades and the earthy volumes are evocative of a geological formation rising from the earth.

The home’s linear synthesis echoes the lines of the horizon, reinforcing its strong connection with the surrounding landscape. This design choice emphasizes the visual harmony between the structure and its environment and enhances openness and continuity.

The northern façade harmonizes with the ground, offering a feeling of protection, while the southern side opens towards the horizon, embodying freedom. As a defining feature of the design, the “L”-shaped pool acts as a connecting element between the building and its surroundings.
Inside, simple geometries and natural textures create a canvas of tranquility.

The living room, with open vistas toward the sea, appears to float between the horizon and the earth. The cross-ventilated design allows air and light to flow freely, transforming the interiors into naturally cool havens during the summer months. Furthermore, three square cuts in the roof function as skylights, bringing the sky indoors and creating a constant play of shadows that evolves with the sun’s movement.

Horizon House is not merely a residence but a space for contemplation and renewal. It embodies a philosophy where sustainability is integral, not auxiliary. Like a geological formation discreetly emerging from the landscape, it serves as a serene observatory of the world — a space for those seeking peace and connection with the natural environment.

A project that balances matter and light, where the earth, sea, and sky compose a scene of harmony. A seamless fusion of form, function, and ecological responsibility honoring the cultural and environmental legacy of the Cyclades.

Image credits Margarita Kyanidou