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Coral Concrete Watchtower with Thermal Regulation and Timber Structure

Authors:
Tobias Tytgat, Fatos Berisha, Jan De Graeve
Coral Concrete Watchtower with Thermal Regulation and Timber Structure
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Constructed from coral concrete and cross-laminated timber, the watchtower integrates thermal regulation features to create a functional space for visitors to explore the surrounding landscape.
5 key facts about this project
01
Constructed with coral concrete to enhance durability and minimize maintenance.
02
Features an innovative cross-laminated timber structure for improved thermal performance.
03
Incorporates a charred wooden façade for natural weather resistance and aesthetic appeal.
04
Designed to optimize visitor interaction through a semi-tempered hallway.
05
Utilizes Dabiri wind turbines to support renewable energy needs.

The project is a multifunctional watchtower located in a distinctive geographical area that emphasizes minimal interference with the natural environment. It aims to engage visitors and offer practical functionality. The design is compact, reflecting the intimate atmosphere of the nearby caves. The overall concept combines simple construction techniques with both passive and modern technologies, allowing for an effective blend of usability and aesthetics.

Design Concept and Spatial Organization

Careful planning outlines the watchtower's spatial organization to promote interaction among visitors. Inside, a semi-tempered hallway and a tourist information center guide guests throughout the building. Heating is limited to key areas, including the office and café, ensuring comfort while providing protection from the elements. This layout invites individuals to connect with one another and the surrounding landscape.

Material Selection and Performance

Several materials have been chosen strategically for construction, aiming for strength and energy efficiency. Cross-Laminated Timber (CLT) panels serve as the main structural framework, lending necessary support. Wood fiber insulation enhances thermal performance, while the ventilated façade made of fired wooden slats improves air circulation and serves an aesthetic purpose.

Sustainable Energy Integration

The design emphasizes sustainability by integrating renewable energy sources. Solar panels on the roof capture sunlight, while Dabiri wind turbines along the access path contribute to the building’s energy demands. This combination helps to reduce the ecological impact and supports self-sufficiency, highlighting the commitment to environmentally friendly practices.

Building Longevity and Maintenance

Durability is a core focus of the watchtower, with coral-based concrete used for the foundation, providing a stable base for essential systems. The choice of a burned façade not only enhances visual appeal but also minimizes maintenance efforts over time, making the building suitable for its environment.

Large windows frame views of the landscape, inviting natural light into the space. This feature deepens visitors’ connection to their surroundings, fostering an appreciation for the natural beauty while providing a comfortable space for exploration and gathering.

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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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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 €
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Final registration deadline 30 October 2025

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