Press kit no. 7735-01

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Press kit - Press release - Horizon House - ONUS Architecture Studio

Press Kit | no. 7735-01

Horizon House

Siros, Greece

ONUS Architecture Studio

A net-zero residence embedded in the cycladic terrain, blending architectural minimalism with regenerative design strategies

Athina, Greece, 2025-08-05 - 

Located on a sloped site in Syros, Horizon House is a net-zero energy residence designed by ONUS Architecture Studio. Rooted in the Cycladic landscape, the project prioritizes energy autonomy, ecosystem restoration, and circular resource use. The semi-subterranean design minimizes visual impact while maximizing environmental performance, offering a case study in regenerative architecture for island environments.


Winner of the 2025 Architizer A+ Award for Unbuilt Sustainable Residential Project, Horizon House by ONUS Architecture Studio is a recognized example of regenerative architecture. Selected by an international jury, the residence was honored for its approach to off-grid energy, site-responsive design, and low-impact construction on an island terrain.


A reinforced connection to place

Located in Syros, Greece, Horizon House sits on a steep slope overlooking the Aegean Sea. The 230-square-meter residence is partially embedded in the earth, allowing the landscape to shape both the form and performance of the building. Stone excavated from the site is used for structural walls and cladding, reinforcing the house’s material connection to place. The design employs reclaimed wood, raw concrete, and native vegetation, resulting in a low-carbon, locally-grounded palette.


The house unfolds along a linear axis parallel to the horizon. Interior spaces face south, offering uninterrupted views, while maximizing passive solar gain. The more sheltered northern façade reduces exposure to prevailing winds and supports thermal comfort. An L-shaped pool defines the outdoor space and contributes to passive cooling, while visually linking the residence to the surrounding topography.


Bioclimatic strategies are central to the design. Deep-set openings, operable windows, and three skylights enable cross-ventilation and natural lighting, reducing the need for mechanical systems. During summer, thermal mass and air circulation maintain stable indoor temperatures.


A fully energy-autonomous project

Micro wind turbines harness the island’s constant wind, while a geothermal system provides heating and cooling. The 300-square-meter green roof collects rainwater, which is filtered and stored through a blue roof system. Greywater is also treated and reused, minimizing waste and enabling off-grid operation.


A landscape design supporting environmental regeneration

Native plants—adapted to the Cycladic ecosystem—were selected to enhance biodiversity, attract pollinators, and stabilize soil. Strategic placement of trees and shrubs provides shading and protection from wind, improving the microclimate around the building. These interventions contribute to long-term soil health and water retention, supporting a self-sustaining ecological balance.


Simplicity and continuity

Inside, the spatial layout emphasizes simplicity and continuity. Living and sleeping areas are organized around natural light and views, with minimal finishes that allow the textures of the materials to define the atmosphere. Transitions between indoor and outdoor space are fluid, with courtyards, terraces, and shaded verandas extending the living experience outward.


Horizon House reflects an approach to regenerative design that prioritizes restoration over consumption. The residence is conceived not only as a shelter, but also as a system that supports environmental and human well-being. It demonstrates how architecture can become part of a broader ecological infrastructure—supporting natural processes while providing a refined and resilient living environment.

By integrating renewable energy, water reuse, local materials, and ecosystem-based strategies, Horizon House offers a model of sustainable living that adapts to place and climate. Its quiet presence in the landscape reflects a commitment to architecture that works with, rather than apart from, the land it inhabits.

Technical sheet

Project Name: Horizon House

Location: Syros, Cyclades, Greece

Client: Private

Architects: ONUS Architecture Studio

Lead Architect: Margarita Kyanidou

Project Team: Christina Ntalli, Aikaterini Korka, Anna Andreadi

Study Completion Date: 2025

Construction Start Date: 2026

Gross Area: 230 m²

Landscape Design: ONUS Architecture Studio 

Project Sector: Residential, Sustainable Architecture

3D Render images: ONUS Architecture Studio

About ONUS Architecture Studio

ONUS Architecture Studio is an Athens-based architectural team committed to sustainable and regenerative design. The studio is steadily expanding and has received multiple international awards and distinctions, including the Architizer A+ Award in 2025.


ONUS brings expertise in circular construction, passive house principles, and ecosystem-based planning. Each project reflects a careful balance between environmental performance, material clarity, and spatial intention—exploring how architecture can actively contribute to both ecological and social systems.

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For more information

  1. onusarchitecture.com/horizon-house/
  2. onusarchitecture.com/

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Horizon House by ONUS Architecture Studio
Video credit: ONUS Architecture Studio
Press kit | 7735-01 - Press release | Horizon House - ONUS Architecture Studio - Residential Architecture - Aerial view of Horizon House nestled into the rocky coastline of Syros. - Photo credit:  ONUS Architecture Studio
Aerial view of Horizon House nestled into the rocky coastline of Syros.
Photo credit: ONUS Architecture Studio
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Medium-resolution image : 9.39 x 6.89 @ 300dpi ~ 4.2 MB

Press kit | 7735-01 - Press release | Horizon House - ONUS Architecture Studio - Residential Architecture - The stone façade mirrors the texture and color of the surrounding terrain. - Photo credit: ONUS Architecture Studio
The stone façade mirrors the texture and color of the surrounding terrain.
Photo credit: ONUS Architecture Studio
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Very High-resolution image : 21.49 x 12.08 @ 300dpi ~ 16 MB

Press kit | 7735-01 - Press release | Horizon House - ONUS Architecture Studio - Residential Architecture - The linear volume follows the contours of the land, combining raw textures with refined precision. - Photo credit: ONUS Architecture Studio
The linear volume follows the contours of the land, combining raw textures with refined precision.
Photo credit: ONUS Architecture Studio
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High-resolution image : 14.57 x 10.93 @ 300dpi ~ 9.8 MB

Press kit | 7735-01 - Press release | Horizon House - ONUS Architecture Studio - Residential Architecture - The living space opens fully to the horizon, blurring the line between architecture and landscape. - Photo credit: ONUS Architecture Studio
The living space opens fully to the horizon, blurring the line between architecture and landscape.
Photo credit: ONUS Architecture Studio
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High-resolution image : 11.73 x 7.36 @ 300dpi ~ 9 MB

Press kit | 7735-01 - Press release | Horizon House - ONUS Architecture Studio - Residential Architecture - At sunset, the geometry of the house reflects across the water, reinforcing its connection to the topography. - Photo credit: ONUS Architecture Studio
At sunset, the geometry of the house reflects across the water, reinforcing its connection to the topography.
Photo credit: ONUS Architecture Studio
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Medium-resolution image : 10.96 x 6.18 @ 300dpi ~ 7.9 MB

Press kit | 7735-01 - Press release | Horizon House - ONUS Architecture Studio - Residential Architecture - The cantilevered structure hovers above the landscape, framing uninterrupted sea views. - Photo credit: ONUS Architecture Studio
The cantilevered structure hovers above the landscape, framing uninterrupted sea views.
Photo credit: ONUS Architecture Studio
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Very High-resolution image : 22.41 x 16.82 @ 300dpi ~ 19 MB

Press kit | 7735-01 - Press release | Horizon House - ONUS Architecture Studio - Residential Architecture - A thick stone wall frames a quiet view of the Aegean, recalling the Cycladic vernacular. - Photo credit: ONUS Architecture Studio
A thick stone wall frames a quiet view of the Aegean, recalling the Cycladic vernacular.
Photo credit: ONUS Architecture Studio
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Low-resolution image : 4.98 x 3.84 @ 300dpi ~ 2.5 MB

Press kit | 7735-01 - Press release | Horizon House - ONUS Architecture Studio - Residential Architecture - Built into the hillside, Horizon House blends with the native terrain through form, material, and vegetation. - Photo credit: ONUS Architecture Studio
Built into the hillside, Horizon House blends with the native terrain through form, material, and vegetation.
Photo credit: ONUS Architecture Studio
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Very High-resolution image : 24.0 x 14.82 @ 300dpi ~ 20 MB

Press kit | 7735-01 - Press release | Horizon House - ONUS Architecture Studio - Residential Architecture - Above the living spaces, a planted green roof integrates a blue roof system that captures, filters, and reuses rainwater, enhancing resilience and supporting local regeneration. - Photo credit: ONUS Architecture Studio
Above the living spaces, a planted green roof integrates a blue roof system that captures, filters, and reuses rainwater, enhancing resilience and supporting local regeneration.
Photo credit: ONUS Architecture Studio
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High-resolution image : 11.24 x 6.3 @ 300dpi ~ 8.4 MB

Press kit | 7735-01 - Press release | Horizon House - ONUS Architecture Studio - Residential Architecture - At night, the softly lit interiors create a quiet dialogue between built and natural environments. - Photo credit: ONUS Architecture Studio
At night, the softly lit interiors create a quiet dialogue between built and natural environments.
Photo credit: ONUS Architecture Studio
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Very High-resolution image : 24.61 x 20.23 @ 300dpi ~ 20 MB

Press kit | 7735-01 - Press release | Horizon House - ONUS Architecture Studio - Residential Architecture - Horizon House under a starlit sky energy-autonomous, silent, and fully immersed in its environment. - Photo credit: ONUS Architecture Studio
Horizon House under a starlit sky energy-autonomous, silent, and fully immersed in its environment.
Photo credit: ONUS Architecture Studio
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Very High-resolution image : 27.19 x 19.2 @ 300dpi ~ 30 MB

Press kit | 7735-01 - Press release | Horizon House - ONUS Architecture Studio - Residential Architecture - Bioclimatic concept diagram illustrating solar gain, prevailing winds, and passive design strategies. - Photo credit: ONUS Architecture Studio
Bioclimatic concept diagram illustrating solar gain, prevailing winds, and passive design strategies.
Photo credit: ONUS Architecture Studio
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High-resolution image : 15.19 x 10.85 @ 300dpi ~ 2.4 MB

Press kit | 7735-01 - Press release | Horizon House - ONUS Architecture Studio - Residential Architecture - Early conceptual sketch exploring the silhouette of the house within the sloped terrain. - Photo credit: ONUS Architecture Studio
Early conceptual sketch exploring the silhouette of the house within the sloped terrain.
Photo credit: ONUS Architecture Studio
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Medium-resolution image : 9.99 x 7.13 @ 300dpi ~ 650 KB

Press kit | 7735-01 - Press release | Horizon House - ONUS Architecture Studio - Residential Architecture - Sketch perspective of the linear spatial arrangement embedded into the landscape. - Photo credit: ONUS Architecture Studio
Sketch perspective of the linear spatial arrangement embedded into the landscape.
Photo credit: ONUS Architecture Studio
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Medium-resolution image : 10.81 x 7.72 @ 300dpi ~ 480 KB

Press kit | 7735-01 - Press release | Horizon House - ONUS Architecture Studio - Residential Architecture - Horizontal massing study illustrating the building’s low-profile integration with the Cycladic topography. - Photo credit:  ONUS Architecture Studio
Horizontal massing study illustrating the building’s low-profile integration with the Cycladic topography.
Photo credit: ONUS Architecture Studio
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Medium-resolution image : 8.99 x 6.42 @ 300dpi ~ 400 KB

Press kit | 7735-01 - Press release | Horizon House - ONUS Architecture Studio - Residential Architecture - Diagram of the regenerative green roof system designed to restore local biodiversity through native and adaptive plant species. - Photo credit: ONUS Architecture Studio
Diagram of the regenerative green roof system designed to restore local biodiversity through native and adaptive plant species.
Photo credit: ONUS Architecture Studio
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Medium-resolution image : 10.89 x 7.7 @ 300dpi ~ 2.1 MB

Press kit | 7735-01 - Press release | Horizon House - ONUS Architecture Studio - Residential Architecture - Southeast elevation and cross-sections showing the integration of the residence into the sloped terrain and the layering of interior, earth, and green roof. - Photo credit: ONUS Architecture Studio
Southeast elevation and cross-sections showing the integration of the residence into the sloped terrain and the layering of interior, earth, and green roof.
Photo credit: ONUS Architecture Studio
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Medium-resolution image : 5.76 x 4.12 @ 300dpi ~ 280 KB

Press kit | 7735-01 - Press release | Horizon House - ONUS Architecture Studio - Residential Architecture - Ground floor plan illustrating the linear spatial arrangement, orientation toward the sea, and connection between indoor and outdoor spaces. - Photo credit: ONUS Architecture Studio
Ground floor plan illustrating the linear spatial arrangement, orientation toward the sea, and connection between indoor and outdoor spaces.
Photo credit: ONUS Architecture Studio
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Medium-resolution image : 5.76 x 4.07 @ 300dpi ~ 390 KB

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