Get inspired!

17,725 architecture projects

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

Algal Community Units Floating in Berlin Waterways

Authors:
Agata Kocirova, Manuel Sacramento, Liv Augsburg, Hampus Jonason Bjärenstam
Algal Community Units Floating in Berlin Waterways
Explore the full project presentation!
Subscribers only
Floating units crafted for algae cultivation and water purification create a sustainable community in the waterways of Berlin, addressing both housing needs and environmental cleanup.
5 key facts about this project
01
Floating units are designed to respond dynamically to varying water levels.
02
Algae pools serve as both a communal feature and a natural water purification system.
03
The project promotes co-living through shared spaces to enhance community interaction.
04
Financial strategies leverage federal waterways for reduced housing costs.
05
The design allows for modular arrangements that adapt to the specific shapes of the waterways.

Alga is located in the waterways of Berlin and aims to tackle the issues of affordable housing and pollution. The project combines communal living with ecological restoration, creating a floating community that adapts to its surroundings. It seeks to transform polluted waterways into usable spaces, fostering connections among residents and contributing to the improvement of local environments.

Floating Housing Design

The design focuses on floating housing units that can move, adapt, and change. These units are built to navigate the canals and rivers of Berlin. This mobility responds to the fluidity of water, creating a living environment that interacts with nature. Each unit is designed to fit well within the local setting, encouraging a close relationship with the water.

Affordable Community Structure

Alga addresses affordability by using non-privately owned federal waterways, which could also qualify for environmental funding. This financial aspect allows for a lower cost of living. The community encourages shared spaces that help reduce individual housing sizes while promoting social interaction. By emphasizing a lifestyle based on shared values and respect for the environment, the design creates a sense of community among its residents.

Ecological Integration

A key feature of Alga is the cultivation of algae in specific water pools. This algae acts as the "heart of the community," helping to clean the polluted water. It thrives on nutrients present in the water, turning waste into useful products like biofuel and organic fertilizer. This relationship highlights the project’s commitment to sustainability and environmental improvement.

Dynamic Arrangements

The layout includes varied arrangements of housing units, forming constellations that respond to the shapes and sizes of the waterways. This setup promotes different kinds of community interactions and creates distinctive atmospheres, allowing each cluster to develop its character. The connections among the units strengthen social ties while supporting the project's ecological goals.

Overall, Alga features a modular design where each unit serves specific community and ecological purposes. The combination of private areas and communal spaces encourages social connections while promoting sustainable living. The project's layout and function reflect a practical approach to coexistence with nature in the urban setting.

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

Enter an open architecture
competition now

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
The Next House: USA

Design the next suburban home for the USA

ideas COMPETITION
Prize Monetary award
Eligibility Open to all
Early bird registration deadline 19 November 2025
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