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Hempcrete Retreat with Spruce Framework in Lithuanian Forest

Authors:
Anna Lipiarz, Tomasz Jałocha, Yevheniia Krepysheva
Hempcrete Retreat with Spruce Framework in Lithuanian Forest
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Constructed with hempcrete and a spruce framework, the cabin in Lithuania integrates sustainable water and energy solutions to serve as a reflective retreat in a forested environment.
5 key facts about this project
01
Constructed with a natural hempcrete insulation for optimal environmental performance.
02
Utilizes a sloped roof designed for efficient rainwater collection.
03
Incorporates large glazing to enhance visual connection with the surrounding landscape.
04
Features a greywater system that supports local biodiversity with native plants.
05
Employs spruce wood for its durability and minimal ecological footprint.

The design features a self-contained cabin situated in a forested area of Lithuania. It serves as a peaceful place for contemplation and connection to nature. The cabin emphasizes sustainability and aims to minimize its impact on the environment. Its layout and design offer a blend of modern living conveniences while encouraging a close relationship with the natural world.

Design Concept

The cabin’s small footprint plays a critical role in reducing its ecological impact on the surrounding landscape. A sloped roof enhances its functionality by allowing for efficient collection of rainwater. This water is channeled into a tank and treated with reverse osmosis, making it safe for drinking. This method supports the idea of responsible resource management while providing essential water supply for occupants.



Energy Efficiency

Energy requirements are met through the integration of photovoltaic panels in the roof. These panels work with a Tesla Powerwall II accumulator to store solar energy for later use. This design ensures that the cabin operates independently, relying mostly on renewable sources. The choice to use solar energy highlights a commitment to sustainability while offering modern comfort.



Material Choices

Construction of the cabin uses spruce wood, known for its strength and sustainability. This choice aligns with the goal of creating a structure that functions well within its natural setting. Spruce wood not only offers durability but also promotes an environmentally friendly approach to building. Its properties contribute to a long-lasting structure that harmonizes with the landscape.



Interior and Exterior Integration

Large windows along the main elevation provide views of the Lithuanian countryside. These openings help blur the lines between the inside and outside, inviting nature closer to the living space. Ventilation is enhanced with adjustable blinds that allow occupants to control light and temperature effectively. This feature contributes to overall comfort inside the cabin, making it a suitable retreat.



The cabin also includes a greywater system that channels used water into an eco swamp filled with native plants. This system supports local ecosystems and demonstrates a commitment to environmental care. Its design reflects a thinking approach to living sustainably while enriching the natural habitat around it.

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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.

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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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