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Warm Concrete Beams Supporting Green Urban Gardens in Rotterdam

Author:
Bastiaan Muilwijk
Warm Concrete Beams Supporting Green Urban Gardens in Rotterdam
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Warm concrete beams support an array of vegetable and fruit gardens, creating a unique integration of urban agriculture within office spaces in Rotterdam.
5 key facts about this project
01
Integrated 50,000 m² of vegetable and fruit gardens into office design.
02
Occupies only 20% of the site, creating expansive green space.
03
Operable windows enhance natural ventilation and air quality.
04
Features two-level warm concrete beams for structural support.
05
Rainwater management system sustains the garden resources.

The Sandwich project is located in the Katendrecht district of Rotterdam and focuses on merging office spaces with the vegetable and fruit industry in the Netherlands. In response to climate change and increasing building density, the design addresses the need for innovative agricultural practices. It integrates 50,000 m² of vegetable and fruit gardens into its structure, fostering a connection between urban life and agricultural activities.

Conceptual Framework

The project occupies only 20% of the site, creating an 8,000 m² entrance garden that enriches the surrounding area. This garden acts as a transition zone, linking the building and natural surroundings. Transparency is a key element of the design, allowing sunlight to illuminate the interior while providing optimal conditions for the gardens.

Spatial Organization

The layout encourages easy navigation and interaction with the green spaces, fostering a lively atmosphere for users. Operable windows are strategically placed to ensure natural ventilation, improving air quality and comfort. This focus on environmental factors underscores the potential of architecture to enhance well-being through its relationship with nature.

Structural Integrity

The building’s structure consists of two-level concrete beams designed to support the various functions within. The use of “warm concrete” is intended to provide comfort in changing weather conditions. Additional reinforcement is applied to high-pressure areas, especially where circulation occurs, ensuring safety and practical movement throughout the space.

Water Management

A smart water management system is integrated, directing rainwater to the gardens. This design choice underlines the commitment to sustainability and responsible resource management in an urban setting. The gardens not only thrive but also contribute to the local ecosystem.

The entrance garden showcases a mix of plant species, creating a vibrant atmosphere that highlights biodiversity. It enhances the visual appeal and offers a welcoming environment for both visitors and occupants.

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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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