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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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Buildner's Unbuilt Award 2026
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100,000€ Prize / 2026

The Next House: USA — A Global Call to Reimagine the American Suburb

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Competition organisers

Buildner is launching The Next House: USA, a global architecture competition that challenges architects, designers, and thinkers to reimagine the American suburban home for the 21st century. For decades, the suburban house has symbolized comfort and stability, but today it often reflects excess, isolation, and environmental strain. This competition asks: how can the American home evolve to address climate urgency, economic pressures, and shifting social values?

Participants are tasked with designing a prototype home of no more than 1,500 sq ft (≈140 m²) for a household of two adults and one child. The design should be compact yet generous, adaptable, sustainable, affordable, and replicable across diverse U.S. contexts. More than a design exercise, the competition aims to spark a conversation about how homes can support healthier, smarter, and more connected communities.

The total prize fund is $20,000 USD. The final registration deadline is May 20, 2026, and winners will be announced on September 22, 2026. The Next House: USA invites architects, students, and visionaries worldwide to redefine what the American home means today—and what it should mean tomorrow.

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Design the next suburban home for the USA

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Prize Monetary award
Eligibility Open to all
Early bird registration deadline 19 November 2025

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