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Environmental Sanctuary Featuring Biogenic Limestone and Carbon Reinforced Concrete

Environmental Sanctuary Featuring Biogenic Limestone and Carbon Reinforced Concrete
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Characterized by its central atrium and use of biogenic limestone alongside carbon reinforced concrete, the design creates a functional living space that harmonizes light, air, and environment while prioritizing sustainable living.
5 key facts about this project
01
Central atrium promotes natural ventilation and light throughout the residence.
02
Carbon reinforced concrete ensures durability while maintaining aesthetic appeal.
03
Biogenic limestone integrates local materials for enhanced sustainability.
04
Innovative shading devices optimize energy efficiency in varying climates.
05
Double-height living areas enhance spatial perception and community interaction.

## Project Overview

Located in a dynamic urban-suburban interface, the Sahn House is a three-story residential structure that reinterprets traditional living spaces to enhance both community interaction and individual privacy. The design strategically organizes its areas to foster a balance between shared and private environments. Central to the concept is the integration of a vertical layout that promotes connectivity among inhabitants while maximizing the use of natural light.

### Spatial Strategy and Circulation

The Sahn House features a central atrium that serves as the heart of the design, allowing light to permeate the structure and facilitating passive ventilation for thermal comfort. This atrium not only enhances the aesthetic appeal but also improves the overall functionality of the home. The circulation system, which includes elegantly designed stairways and an elevator, ensures ease of access throughout the three levels, accommodating diverse mobility needs and prioritizing user experience. The organization of different functions across the levels is methodically planned: the ground floor accommodates public areas, including garage services and a lobby; the second level includes communal spaces for living and dining; while the top floor is dedicated to private quarters.

### Material and Environmental Considerations

The selection of materials reflects a focus on sustainability and aesthetic coherence. The use of carbon reinforced concrete, blockwork, and biogenic Aegean limestone cement not only supports structural integrity but also enhances thermal stability and visual appeal. These materials collectively contribute to an environmentally sensitive design, while features such as evaporative cooling systems and rooftop gardens create microclimates that connect occupants with nature. The integration of double-height spaces enriches the interior experience, promoting airflow and natural light, particularly in common areas.

Overall, the Sahn House is characterized by a meticulous approach to materiality and spatial organization, aiming to provide a harmonious living environment that responds to both the needs of its residents and its surrounding context.

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Buildner's Unbuilt Award 2025
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100,000€ Prize / 2025
The Home of 
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The Buildner’s Unbuilt Award 2025: Celebrating Architectural Creativity and Visionary Unbuilt Designs with a Total Prize Fund of €100,000

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Competition organisers

The Buildner’s Unbuilt Award 2025 is an international architecture competition dedicated to recognizing and celebrating the value of unrealized architectural designs. It invites architects, designers, and students worldwide to submit visionary projects that have not yet been constructed, highlighting the power of ideas and the creativity behind the design process. By focusing on unbuilt work, the competition aims to bring forward concepts that shape the future of architecture and push the boundaries of the profession. 

Participants can compete in three categories based on project scale: Small Wonders (up to 100 m²), Medium Marvels (101–999 m²), and Large Visions (over 1,000 m²). Each category winner will receive €20,000, and additional prizes include honorable mentions, student awards, and a special Best Presentation Award. Winning projects will gain significant international exposure through Buildner’s publicity campaign and a feature article on ArchDaily, providing a unique opportunity to showcase creative ideas to a global audience. 

The Buildner’s Unbuilt Award 2025 encourages entrants to submit any type of unbuilt project, from conceptual visions to detailed designs, celebrating bold innovation without the constraints of realization. Important deadlines: registration closes on October 30, 2025; submissions are due by November 20, 2025; winners will be announced on December 17, 2025.

Buildner's Unbuilt Award 2025

Celebrating your unbuilt architecture visions with a €100,000 prize

100,000€ Prize / 2025 ideas COMPETITION
Prize 100,000 €
Eligibility Open to all
Final registration deadline 30 October 2025

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