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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 Buildner’s Unbuilt Award 2025: Celebrating Architectural Creativity and Visionary Unbuilt Designs with a Total Prize Fund of €100,000

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Competition organisers

The Buildner’s Unbuilt Award 2025 is an international architecture competition dedicated to recognizing and celebrating the value of unrealized architectural designs. It invites architects, designers, and students worldwide to submit visionary projects that have not yet been constructed, highlighting the power of ideas and the creativity behind the design process. By focusing on unbuilt work, the competition aims to bring forward concepts that shape the future of architecture and push the boundaries of the profession. 

Participants can compete in three categories based on project scale: Small Wonders (up to 100 m²), Medium Marvels (101–999 m²), and Large Visions (over 1,000 m²). Each category winner will receive €20,000, and additional prizes include honorable mentions, student awards, and a special Best Presentation Award. Winning projects will gain significant international exposure through Buildner’s publicity campaign and a feature article on ArchDaily, providing a unique opportunity to showcase creative ideas to a global audience. 

The Buildner’s Unbuilt Award 2025 encourages entrants to submit any type of unbuilt project, from conceptual visions to detailed designs, celebrating bold innovation without the constraints of realization. Important deadlines: registration closes on October 30, 2025; submissions are due by November 20, 2025; winners will be announced on December 17, 2025.

Buildner's Unbuilt Award 2025

Celebrating your unbuilt architecture visions with a €100,000 prize

100,000€ Prize / 2025 ideas COMPETITION
Prize 100,000 €
Eligibility Open to all
Final registration deadline 30 October 2025

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