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Rooftop Greenhouse with Rammed Earth and Wooden Fiber Insulation

Authors:
Nicholas Diddi, Riccardo Cosco
Rooftop Greenhouse with Rammed Earth and Wooden Fiber Insulation
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A rooftop greenhouse enhances a compact two-storey living space constructed with rammed earth and wooden fiber insulation, promoting sustainable urban living through adaptable design and community engagement.
5 key facts about this project
01
Double-height living area enhances spatial dynamics and connectivity.
02
Rooftop greenhouse facilitates urban agriculture and green interaction.
03
Service areas are integrated within a unique "box in the box" design.
04
80% of the materials used are bio-based, promoting sustainability.
05
Mezzanine level offers versatile use as a workspace or storage.

Microhome 2020: H-EART-H CYCLE presents a thoughtful approach to sustainable living in urban settings. The design features a compact two-storey structure, focused on creating a functional space that interacts positively with nature. The project embodies a concept that connects the rhythms of human life with the cycles of the environment.

Design Concept

The layout of the structure highlights a double-height living area, which brings a sense of openness and light into the home. This central space encourages social interaction and makes the home feel larger than its physical footprint. Surrounding the living area, service spaces such as the kitchen, bathroom, and entrance are integrated within a "box in the box" design. This strategy efficiently organizes space while maintaining the comfort needed for everyday living.

Spatial Flexibility

Above the living area, a mezzanine provides additional flexibility within the home. This space can serve multiple functions, working as an open bedroom, storage area, or workspace. Residents can easily adapt it to fit their routines. A small balcony extends from this level, leading to an outdoor staircase that connects to the greenhouse on the roof. This connection reinforces the relationship between indoor and outdoor living.

Material Use and Sustainability

The design prioritizes sustainable practices through careful material selection. A wooden framework supports the structure, while wooden fiber insulation helps to regulate temperature. The exterior is finished with prefabricated panels made of rammed earth, connecting the structure to natural materials. This choice reflects a commitment to reducing environmental impact while also offering durability.

Technical Features

Visible on the exterior are various technical installations, such as pumps, tanks, and solar panels. This placement not only improves efficiency but also allows for easy access for maintenance. The project uses bio-based materials for 80% of its construction, showcasing an effort to promote eco-friendly building practices. This approach offers residents the potential for a self-building experience, engaging them more closely with their living space.

At the top, the greenhouse stands as a functional garden area, enabling residents to grow plants and engage with nature. It serves as a small urban farm, fostering a deeper connection to the environment. This space exemplifies the integration of living with green practices, emphasizing the importance of nature in contemporary urban life.

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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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