Get inspired!

17,725 architecture projects

Learn from past Buildner architecture competition participants through our extensive project library, curated over more than 15 years!

Etfe Roof over Concrete Structure Integrating Nature and Accessibility

Author:
Mircea Vasvari
Etfe Roof over Concrete Structure Integrating Nature and Accessibility
Explore the full project presentation!
Subscribers only
Set against the backdrop of Hverfjall Volcano, the structure's ETFE roof and in-situ reinforced concrete walls create a greenhouse restaurant that emphasizes sustainability and accessibility while fostering a strong connection to the surrounding landscape.
5 key facts about this project
01
The greenhouse integrates climate control systems directly within the landscape.
02
A concrete retaining wall defines circulation routes and planting areas.
03
ETFE roof structure allows for maximum sunlight while minimizing weight.
04
Ramps provide seamless access between multiple levels without disrupting the terrain.
05
Rainwater collection systems are designed to enhance sustainability through natural resource management.

The Greenhouse Restaurant is located at the base of Hverfjall Volcano, designed to blend with the natural environment while providing a dining experience. It consists of two main volumes: a long, narrow greenhouse and a square support building. The overall design focuses on maximizing sunlight and offering views of the surrounding landscape, creating a comfortable place for guests.

Design Concept

The arrangement of the two volumes is set at a 45-degree angle to each other. This orientation helps reduce shading on the greenhouse and also strengthens the visual connection between the multipurpose hall and Hverfjall Volcano. The design takes advantage of the site’s natural features and enhances both light and sightlines, allowing visitors to enjoy the unique landscape.

Accessibility Features

The design prioritizes accessibility for all visitors. The support building is created to allow easy movement across multiple levels while respecting the existing landscape. Ramps lead guests to the main entrance on the ground floor as well as to the multipurpose hall above. A bridge connects to the roof terrace, providing direct access for hikers and ensuring a strong connection to the outdoor setting.

Sustainable Climate Control

Sustainability is a key aspect of the restaurant’s operation. The greenhouse is designed to keep air volume low, which is important for managing temperature and humidity effectively. Circulation routes are integrated into the landscape, resulting in a lower roof height that fosters a closer relationship with the plants. Concrete retaining walls help define circulation paths and planting spaces, creating opportunities for visitors to interact with the greenery.

Material Considerations

Material choices are essential for both performance and visual effect. The structure supporting the ETFE roof features a lightweight metal framework designed to minimize ground disturbance through the use of pier foundations. The support building is constructed with in-situ reinforced concrete, selected for its durability and compatibility with the terrain.

The design incorporates practical features, such as rainwater collection systems placed under the planting areas, which gather water from the roofs. This promotes efficient water management, supporting the overall sustainability of the restaurant.

Noticed a mistake?
Highlight the text and click on
Noticed a mistake

Enter an open architecture
competition now

The Architect’s 
Stair
The Architect’s Stair
Take a step and make a statement! Edition #3
Kinderspace
Kinderspace
Architecture for Children’s Development #3
Buildner's Unbuilt Award 2025
Buildner's Unbuilt Award 2025
100,000€ Prize / 2025
The Home of 
Shadows
The Home of Shadows
The light studies. Edition #4
The Architect's 
Chair
The Architect's Chair
Take a seat and make a statement! Edition #5

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

`
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

Open architecture competitions

  • Closest deadline first
  • Project competitions first
    Selected winning projects have the potential to be constructed
  • Ideas competitions
    Experimental competitions with the focus on pushing the boundaries of creativity
new
Iceland 
Slow Sauna

Design slow sauna in Iceland

project COMPETITION
Prize Monetary award
Eligibility Open to all
Early bird registration deadline 26 November 2025
Concrete 
Pavilion

Design a concrete pavilion

Edition #3 ideas COMPETITION
Prize Monetary award
Eligibility Open to all
Final registration deadline 27 November 2025
new
Pavilion Atlas 2026

Design a story of your country

ideas COMPETITION
Prize Monetary award
Eligibility Open to all
Early bird registration deadline 21 January 2026

Recurring architecture competitions

new
The Architect’s 
Stair

Take a step and make a statement!

Take a step and make a statement! Edition #3 ideas COMPETITION
Prize Monetary award
Eligibility Open to all
Early bird registration deadline 15 October 2025
Kinderspace

Design a kindergarten of tomorrow

Architecture for Children’s Development #3 ideas COMPETITION
Prize Monetary award
Eligibility Open to all
Advance registration deadline 16 October 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
new
The Home of 
Shadows

Design a home with no artificial lighting

The light studies. Edition #4 ideas COMPETITION
Prize Monetary award
Eligibility OPEN TO ALL
Early bird registration deadline 5 November 2025
The Last 
Nuclear Bomb Memorial

Design a memorial that speaks to the cause of ending all nuclear weapons programs

Edition #6 ideas COMPETITION SILENT CONTEST For this competition, NO DESCRIPTION TEXT is allowed. The architecture ideas must be communicated strictly with visuals.
Prize Monetary award
Eligibility Open to all
Final registration deadline 13 November 2025
new
The Architect's 
Chair

Take a seat and make a statement!

Take a seat and make a statement! Edition #5 ideas COMPETITION
Prize Monetary award
Eligibility Open to all
Early bird registration deadline 20 November 2025
Hospice - 
Home for the 
Terminally ill

Design a safe and supportive space to those struggling with a terminal illness

Edition #5 ideas COMPETITION
Prize 10,000 €
Eligibility Open to all
Final registration deadline 26 November 2025
Museum of 
Emotions

Use architecture to create different emotional states

Edition #7 ideas COMPETITION SILENT CONTEST For this competition, NO DESCRIPTION TEXT is allowed. The architecture ideas must be communicated strictly with visuals.
Prize Monetary award
Eligibility Open to all
Final registration deadline 27 November 2025
Re:Form - 
New Life 
for Old Spaces

Choose a site—used, abandoned, or forgotten—anywhere in the world, and give it a new purpose

Edition #2 ideas COMPETITION
Prize Monetary award
Eligibility Open to all
Advance registration deadline 3 December 2025

Media, partners and clients

To view this project in detail,
please log in with your
Architects’ Network Plus account.
Subscription instantly unlocks all the architecture projects plus other member-only benefits:
  • Access the 17,725 Concept Library
  • Professional tools including file transfer, email, portfolio management, and more
Register now
Already a member? Log in

This website uses cookies to improve user experience and gather usage statistics.

More information is available in our Privacy & Cookie policy