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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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MICROHOME 10: Celebrating Small-Scale Living with €100,000 Prize Fund and Kingspan’s Innovation

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Competition organisers

The MICROHOME 10 competition invites participants to submit visionary designs for off-grid, modular microhomes that push the limits of sustainable, small-scale living. Organised by Buildner in partnership with Kingspan and Hapi Homes, this tenth edition sets the challenge of designing a dwelling for two people within a maximum floor area of 25 m², encouraging bold solutions adaptable to any urban or rural location. The competition continues Buildner’s mission to foster innovative approaches to compact, energy-efficient housing that can address pressing global challenges.

This year’s edition offers a generous total prize fund of €100,000, including the Kingspan Award for designs that integrate high-performance Kingspan products and the Hapi Homes Award for a project selected for real-world construction. In addition to cash prizes, the winners gain international exposure through Buildner’s media partnerships, publications, and a dedicated MICROHOME magazine, further amplifying their ideas to the wider architectural community.

Key dates for MICROHOME 10 include the closing date for registration on 25 September 2025, the submission deadline on 29 October 2025 (11:59 p.m. London time), and the announcement of winners on 9 December 2025. These milestones ensure participants have clear timelines to develop and present their concepts, with early registration discounts available to support students and emerging designers worldwide.

MICROHOME

Design a new small-scale home concept in the 10th edition of MICROHOME — 100,000 € prize + construction

100,000 € Prize Fund / Kingpsan Edition #10 ideas COMPETITION
Prize 100,000 € + Potential realisation
Eligibility Open to all
Final registration deadline 25 September 2025

Open architecture competitions

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Prize Monetary award
Eligibility Open to all
Final registration deadline 18 September 2025

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