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Rooftop Garden and Greywater Recycling in CLT Community Living

Author:
Rebecka Carlsson
Rooftop Garden and Greywater Recycling in CLT Community Living
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A rooftop garden integrates with a greywater recycling system in a CLT building designed for communal living, fostering sustainability and connection among residents.
5 key facts about this project
01
Rooftop garden provides fresh produce for communal kitchens.
02
Cross-laminated timber structure reduces carbon emissions.
03
Greywater recycling system supports efficient water usage.
04
Separate private and communal spaces enhance resident interaction.
05
Composting toilets convert waste into usable fertilizer.

The architectural design featured in this project focuses on the idea of biophilia, promoting communal living while ensuring a strong connection with nature. Located in an urban setting, the design encourages residents to engage with each other and their surroundings. It combines private living spaces with communal areas, creating an environment where social interaction and collaboration can flourish.

Site Strategy

The building layout clearly separates private and shared spaces. Private residences occupy the upper tower, providing a quiet retreat for individuals. In contrast, the lower levels include communal facilities like a large kitchen for shared cooking and a daycare center. This arrangement supports daily social activities, allowing residents to connect and build relationships within their community.

Sustainable Practices

Sustainability plays an important role in the design. Stormwater management systems collect rainwater for irrigation, minimizing reliance on external water sources. Greywater recycling systems are also in place, using specially designed gardens to filter water for communal use. Additionally, composting toilets convert waste into fertilizer, highlighting a commitment to resource recycling and environmental stewardship.

Material Application

Cross-Laminated Timber (CLT) is chosen as the primary construction material, offering strong structural support while reducing carbon emissions. The design utilizes temporary greenhouses to provide extra heating during colder months. It also enhances indoor comfort through optimized cross-ventilation, allowing fresh air to circulate effectively.

Ecological Integration

The project addresses urban challenges such as traffic congestion and air pollution, promoting alternative transportation methods like car-sharing. By reducing the need for parking, the design aims to reclaim street space for pedestrians and local wildlife. Vacant lots nearby are envisioned as green spaces or urban farms, contributing further to biodiversity and public health. This integration aids in creating a more vibrant and connected community.

The rooftop garden serves multiple purposes, supplying fresh produce for communal kitchens and providing a habitat for local wildlife. This relationship with nature enhances the daily lives of the residents, reinforcing the biophilic principles that guide the design.

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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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