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Seagrass Insulation and Timber Structure by the North Sea

Authors:
Anna Plattl, Florian Vogel
Seagrass Insulation and Timber Structure by the North Sea
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Utilizing seagrass for insulation and constructed with cross-laminated timber, this coastal residence integrates sustainable practices while providing a serene living space for its occupants.
5 key facts about this project
01
Utilizes seagrass for insulation, promoting local material use and sustainability.
02
Integrates a marsh plant purification system for effective rainwater management.
03
Features large panoramic windows to enhance connection with the coastal landscape.
04
Incorporates an exhaust gas heat exchanger for efficient hot water preparation.
05
Constructed with cross-laminated timber for improved thermal performance.

The design is situated between the gentle dunes and the North Sea coast, aiming to create a sustainable living space for its residents. The layout incorporates key principles of energy efficiency and resource management. With a focus on blending into the natural landscape, the design addresses essential modern needs while promoting eco-friendly practices.

Energy Generation

The roof is designed to generate solar energy, providing enough electricity for two residents. This feature not only serves energy needs but also includes a power storage system for excess production. This stored energy can be used for heating and hot water, supporting a sustainable lifestyle.

Water Management

Rainwater collection plays an important role in the functionality of the design. A marsh plant purification system is located on the roof, which treats rainwater and recycles wastewater to enhance usability. A recycling shower reduces fresh water consumption to just 10 liters per use, exemplifying practical resource management.

Spatial Arrangement

Large windows throughout the home frame views of the sea, providing a visual connection to the surroundings. These windows allow ample natural light into the space, creating a warm and inviting atmosphere. A light shaft further enhances natural illumination, ensuring that daylight reaches even the more secluded areas of the house.

Material Selection

The structural elements of the building are made from cross-laminated timber, which is known for its effective thermal properties. This choice helps maintain comfortable temperatures while aligning with sustainable building practices. Seagrass, sourced locally, serves as insulation, valued for its breathability and natural qualities. The exterior features CO2-treated spruce wood, typical of Scandinavian design, promoting durability and environmental harmony.

A notable detail is the use of cork mats, which provide sound insulation. This addition fosters a peaceful atmosphere within the home, ensuring that daily life remains calm and undisturbed by external noise.

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

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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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