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Suspended Living Units Enhanced by Local Sandstone and Green Roofs Beneath Urban Bridges

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Suspended Living Units Enhanced by Local Sandstone and Green Roofs Beneath Urban Bridges
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Suspended residential units crafted from local sandstone and integrated with green roofs redefine urban living by transforming the often-overlooked spaces beneath bridges into functional community spaces.
5 key facts about this project
01
Suspended living units utilize the underside of bridges to create innovative housing solutions.
02
Integration of local sandstone enhances aesthetic coherence with the urban environment.
03
Green roofs promote biodiversity and provide communal outdoor spaces for residents.
04
Large windows in units maximize natural light and views while maintaining privacy.
05
Design fosters connectivity to surrounding neighborhoods through accessible pedestrian pathways.

### Overview and Concept

Located in Luxembourg City, the project addresses the pressing housing crisis by integrating residential units beneath bridge structures. This approach maximizes underutilized urban spaces, transforming them into functional living environments. The initiative aims to increase housing availability while simultaneously improving the aesthetic and functional aspects of existing urban infrastructure, aligning with the city's needs for innovative housing solutions.

### Spatial Strategy and Community Integration

The design features compact residential units arranged to optimize natural light through large windows and balconies, enhancing the indoor-outdoor relationship. Ground and first-floor layouts thoughtfully separate sleeping and communal areas, fostering a balance between privacy and social interaction. Shared green spaces are incorporated to promote community engagement, providing residents with communal areas that facilitate interaction while enhancing ecological sustainability through green roofs and terraces.

The project strategically includes ramps that connect to the upper deck of the bridge, ensuring easy pedestrian access to surrounding parks and residential areas. This integration reinforces the relationship between the built environment and the natural landscape, encouraging a re-evaluation of underdeveloped land around urban infrastructure.

### Materiality and Aesthetic Considerations

Local sandstone serves as the primary facade material, establishing visual continuity with the surrounding environment while reinforcing regional identity. The extensive use of glass in the residential units not only creates expansive views but also contributes to a sense of spaciousness within confined areas. Structural elements utilize steel and concrete, ensuring that the design maintains structural integrity while reflecting contemporary architectural principles.

The careful selection of materials emphasizes cultural sensitivity and contextuality, creating an architectural language that resonates with Luxembourg's historical and aesthetic attributes. Design elements prioritize functionality without compromising aesthetic appeal, balancing utility and beauty throughout the living spaces.

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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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