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Harnessing Thermal Mass with Natural Cob and Dynamic Outdoor Spaces

Authors:
Marcin Bombalicki, Maurycy Olszewski
Harnessing Thermal Mass with Natural Cob and Dynamic Outdoor Spaces
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Utilizing a cob wall and a thermal mass system, the design maximizes energy efficiency and connects seamlessly with outdoor terraces, creating a sustainable residence that promotes both comfort and community interaction.
5 key facts about this project
01
Utilizes a cob wall for natural thermal insulation.
02
Incorporates a heated thermal mass wall for year-round comfort.
03
Features a reciprocal roof structure for flexible interior layout.
04
Designed with large openings for panoramic exterior views.
05
Includes an outdoor terrace that extends from the kitchen space.

The Suncatcher project presents a thoughtful approach to living spaces that harmonize with the surrounding environment. It focuses on creating a comfortable home while also being mindful of energy use. Located in a landscape that provides ample natural light, the design is structured around an open floor plan, encouraging connections among those who inhabit the space. The entire concept revolves around the careful use of sunlight and the management of heat, reflecting a commitment to sustainable living.

Form Evolution

The design emphasizes reducing external surfaces to help regulate temperature and maximize incoming light. Openings in the structure are positioned to catch the sun's rays, lowering the need for electric lighting during the day. The use of a reciprocal roof structure is particularly noteworthy. It allows for a flexible layout that fosters warmth and brightness inside, creating an inviting atmosphere.

Seasonal Strategies

Understanding seasonal changes is central to the design. In winter, the structure captures solar energy to make the interior warm and cozy. In summer, overhangs protect against direct sunlight to prevent overheating. The inclusion of a heated thermal mass wall is essential for maintaining comfortable temperatures year-round. Combined with a rocket stove, this feature enhances the home's energy efficiency, making it adaptable to varying weather conditions.

Material Selection

A cob wall comprises the building’s exterior, made from a simple mix of clay, sand, straw, and water. This natural material serves as a thermal barrier, protecting the interior from harsh winds while keeping energy costs low. Large windows open the main space up to expansive views, allowing occupants to connect with the environment outside, which is a key element in the design philosophy.

Outdoor Integration

The outdoor terrace extends directly from the kitchen, promoting easy access to outdoor activities. This thoughtful layout encourages a lifestyle that values nature and interaction. Vegetation is incorporated thoughtfully within the design, enhancing the microclimate and improving air quality. These plants contribute to a sustainable environment, fostering a sense of well-being for those who live and work in the space.

The interplay of light and shadows across the thermal mass wall brings the design to life, changing throughout the day and adding a dynamic quality that enriches the experience of the living spaces.

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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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