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Curved Walls and Green Roofs with Ecosan Toilets in a Sustainable Landscape

Author:
Rosita Di Mizio
Curved Walls and Green Roofs with Ecosan Toilets in a Sustainable Landscape
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The integration of curved walls and a green roof, complemented by EcoSan toilets and a landscape of 10,000 fruit trees, creates an environmentally sustainable living space designed for off-grid functionality.
5 key facts about this project
01
Curved walls enhance both aesthetics and energy efficiency.
02
A green roof supports biodiversity and rainwater management.
03
Human waste is composted through EcoSan toilets.
04
10,000 fruit trees are planted using humanure in the surrounding landscape.
05
Gray water recovery systems repurpose water for irrigation and flushing.

The "Curved Walls - Green Roof" design stands out in its countryside setting, promoting sustainable living through a thoughtful arrangement of space and form. The modular structure features distinctive curved walls that not only add aesthetic value but also enhance the building's energy performance. Designed for off-grid living, it provides a practical solution for modern environmentally-conscious residents.

Design Concept

The design embraces a fluid form that departs from typical straight lines. Curved walls create a unique connection between indoor and outdoor spaces, allowing natural light and air to flow freely throughout. This approach not only fosters a welcoming atmosphere but also improves energy efficiency by reducing reliance on artificial lighting and climate control systems.

Sustainable Features

Sustainability is central to the design, with features such as SOIL's EcoSan toilets that compost human waste. This method contributes to a circular approach to resources. In addition, the landscape integrates 10,000 fruit trees planted with humanure, creating a blend of living space and productive land. These elements together demonstrate a commitment to merging human habits with nature.

Energy and Water Systems

To ensure energy independence, the structure incorporates various renewable energy systems. Wind turbines and solar panels on the roof harness natural resources, while a solar thermal heating system provides hot water for everyday use. Water efficiency is prioritized through gray water recovery, which collects used water from sinks and showers, allowing it to be reused for irrigation and toilet flushing.

Lighting and Landscaping Strategies

Lighting design employs energy-efficient options like CFL, LED, and OLED fixtures positioned to maximize visibility without excessive energy consumption. The landscaping strategy further supports ecological responsibility, utilizing mulch from removed trees and reusing excavated materials for constructing site foundations. This not only reduces waste but also enhances the overall environment.

The building's exterior features vegetation that aids in insulation and supports local wildlife, fostering a sense of biodiversity and connection to nature. This combination of practical design and ecological sensitivity creates a unique living experience that aligns with contemporary environmental challenges.

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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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