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Earth-Sheltered Structure with Recycled Lumber and Green Walls Designed for Community Engagement

Earth-Sheltered Structure with Recycled Lumber and Green Walls Designed for Community Engagement
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Constructed with recycled lumber and integrated green walls, the earth-sheltered observation tower enhances the natural landscape while serving as a focal point for community interaction and ecological awareness.
5 key facts about this project
01
Utilizes recycled plastic lumber to minimize environmental impact.
02
Features a facade wrapped in vibrant sunflowers to reflect local flora.
03
Incorporates compressed earth blocks for enhanced thermal efficiency.
04
Designed with green walls to promote biodiversity and habitat creation.
05
Engages the community through interactive trails and participatory maintenance.

## Overview
The Superbloom observation tower is located near Silver Lake in South Dakota, aiming to honor local architectural heritage while promoting environmental awareness. Its design draws inspiration from the historical sod dugout houses that once provided shelter to pioneers in the region. The project emphasizes the importance of integrating contemporary architectural practices with the cultural and historical significance of the area, facilitating access for both local residents and tourists.

## Design Strategy
### Structural Integration and Materiality
The tower features an earth-sheltered design that subtly blends into the natural surroundings, reflecting the historical context of the dugouts. The use of recycled plastic lumber as the primary structural material supports sustainability while connecting the structure to its landscape. The visually striking façade, characterized by vibrant yellow sunflowers and a red exterior reminiscent of traditional barns, enhances the ecological aesthetic and further roots the design in local identity. Key materials include engineered lumber for modular construction, compressed earth blocks for sheltering, and marine-grade recycled plastic piles for structural support.

### Ecological Engagement
The project is designed with a focus on enhancing ecological awareness and community interaction. A network of pathways and footbridges facilitates exploration of the terrain, while gathering spaces foster community engagement. Features such as the "dugout trail," bird habitats, and irrigated green walls promote biodiversity and offer educational experiences centered on local ecology. Future phases will expand the project with additional habitat towers and interactive trails, further enriching visitor experience and wildlife habitats.

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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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