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Geothermal Integration and Lavacrete Cladding in a Sustainable Coffee House

Author:
Zechariah Fung
Geothermal Integration and Lavacrete Cladding in a Sustainable Coffee House
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Using Lavacrete cladding and cross-laminated timber, the design embraces the volcanic landscape while providing a sustainable gathering space for visitors to enjoy Iceland’s unique geothermal environment.
5 key facts about this project
01
Emphasizes geothermal integration through Earth-sheltered design.
02
Uses Lavacrete, crafted from local aggregates, for sustainable cladding.
03
Incorporates cross-laminated timber for rapid construction and energy efficiency.
04
Mimics traditional turf homes to connect with Icelandic architectural heritage.
05
Features large openings to enhance natural light and landscape views.

The Iceland Volcano Coffee Shop is located within Hverfjall, a large volcanic crater in northern Iceland. The site is characterized by its unique landscape formed by volcanic and geothermal activity, which has shaped its surroundings over time. The design of the coffee shop reflects a commitment to connect with this environment while drawing inspiration from the local architectural heritage. The building serves both as a gathering space for visitors and as a representation of the region’s cultural identity.

Architectural Inspiration
The design draws from traditional turf homes, known as Torfbaeir, which have deep historical roots in Iceland dating back to the Viking age. These homes were built using local materials, such as uncut stone and timber, and were designed to protect against the harsh Icelandic climate. The coffee shop reflects this traditional approach by using forms that integrate with the landscape, effectively minimizing its impact on the environment while enhancing thermal performance.

Materials and Sustainability
At the core of the design is the use of cross-laminated timber (CLT), a pre-fabricated building system that offers structural benefits and sustainability. CLT is the main framing material for the coffee shop, allowing for quicker construction and providing insulation that improves energy efficiency. The design of the panels helps maintain a comfortable ceiling height and contributes to overall energy-saving features.

Connection to the Landscape
The exterior of the coffee shop is clad with Lavacrete, a composite material developed on-site that blends well with the volcanic surroundings. This choice of material highlights environmental considerations, as it uses local aggregates sourced from the construction site. By doing so, the building reduces its carbon footprint and visually connects with the natural landscape.

Functional Layout
The layout of the coffee shop is thoughtfully designed to create clear areas for different activities, such as a reception space, coffee bar, and roasting section. This planning promotes easy movement throughout the building and enhances the overall experience for visitors. Large windows and openings allow plenty of natural light to enter, encouraging a connection with the landscape outside while creating a welcoming atmosphere.

The integration of these design elements allows the coffee shop to frame views of the surrounding crater, fostering a strong connection to the unique geological and cultural aspects of Hverfjall. Visitors can engage with the natural beauty of the area while enjoying a space that reflects both the past and the future of architecture in Iceland.

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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.

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