Tammelan Kruunu

First prize – large-scale interventions

Tammelan Kruunu

By: Lisa Voigtländer & Sung Bok Song

​This project focuses on complementary wood architecture for sustainable urban densification in Tampere’s city district Tammela in Finland. Tammela had been chosen for an urban densification pilot project site, supporting the prospective developments and increasing population of Tampere city center. Moreover, there are many potential spaces to build new housing on the rooftops in Tammela. Emerging from those identified spaces for densification this project offers an infill solution by applying pre-manufactured housing units designed by Kerto LVL. The design presents an extension, which is placed on top of an existing concrete element building from the 60´s, a building typology that can be found in many cities around the world.

A significant part of the design is the proposal for a conceptual idea of a wood construction system of prefabricated, customized three dimensional units and their assembly at site. In combination of today´s common application of Building information technology (BIM) software, these prefabrication options could be integrated and coordinated already during the design process. Anticipating future possibilities of that method could result in an efficient production of unique, customized architectural housing design.

1) Design Ideas

  • “Old and New”: Adapting the new building structure to the existing buildings, their edges and masses. Designing the new structure in relation to the existing one but as well balance it by developing new spatial expressions and contemporary appearance of the architecture. 
  • “More and Less”: A way to balance an efficient utilization of the infill spaces with a deliberate approach to improve the living and spatial qualities of the site. 
  • “Outside and Inside”: The outside, meaning the facades facing the streets adapting more to existing buildings with their white, plastered facade walls and straight shape. In the inside, yard facing direction appears wooden cladding, for a cozier and warmer atmosphere of the inside. To balance the two sides, wooden materials as well appear on the outside facade, for example the window frames, bay windows or shading elements. 
  • “Open and Close”: Big windows and opening options of the apartments, providing natural light and a close relationship to the outside, which can be balanced with shading elements to adjust open and closeness as pleased, for sun and especially sight protection. 
  • “Common and Private”: The semi-private terraces on the rooftops are providing variations of outside spaces to integrate private and common.

2) Strategic objectives

  • Developing a related structure for the two attached buildings and take advantage of the whole connected rooftops located at the site.
  • Joining the new structure through the existing staircases with the existing buildings, but also add one extra staircase for separate access and fire safety purposes.
  • Reintegrating the community saunas to the new apartment structure, of interlocking duplex apartments.
  • Opening a passage in form of an alley to connect all staircases and the entrances of the new houses with each other and with the new proposed roof garden on the southern rooftop.

The Designers: ​Lisa Voigtländer & Sung Bok Song

Lisa Voigtländer & SungBok Song - the winning designers of the City Above the City competition 

The designing team of the project Tammelan Kruunu are M.Sc.(Arch.) Lisa Voigtländer and M.Sc.(Arch.) Sung Bok Song. Both recently graduated from Tampere University of Technology(TUT), Finland. The main designer of Tammelan Kruunu is Lisa Voigtländer. The project and design were part of her Master Thesis. Song, architect and researcher from South Korea supported her as an assistant for this competition. Voigtländer is coming from Germany, where she had studied architecture and learned the craftsmanship of furniture making. Currently, she works as a designer at Architecture Office Österlund and is teaching at TUT.

Jury's comments 

Stefan Winter:

The proposal is not only excellent in dealing with the existing building stock and improvement of architecture, it is also delivering an attempt of industrial prefabrication, proposing 3D-subassemlies to create adaptable, complete solved building solutions.

 Mike Kane:

​The universal question on the current urban housing stock is a common theme throughout the competition. What makes this scheme stand out is that it sees the potential in the building it extends. With a thorough understanding of the architectural language, construction, and its urban context, the idea also provides a wide variety of apartment types for all walks of society, as well as rich social spaces for people to enjoy and meet.

Michael Green:

This was an outstanding entry.  While many proposals added one, two or three storeys to the roof of an existing building, this concept demonstrated social and design subtley by creating a unique community of residences with shared amenity space. The result is an elegant design that clearly enhances the modest existing structure.

City Above the City architecture competition

Plan B : City Above the City architecture competition 

Metsä Wood challenged architects and students around the world to push the boundaries of modern wood building design in the urban environment. Entrants from 40 countries created their Plan B to urbanisation using wood (Kerto® LVL – laminated veneer lumber) as the main material. The task was to design a wooden extension to an existing urban building. The entries were designed to 69 cities worldwide.

The winners


Tammelan Kruunu by Lisa Voigtländer (Germany) and SungBok Song (Korea)



Lightweight Living by Joshua Duncan & Chaz Flint​


Plug-In by Jari Lonka, Francesco Allaix & Lilja Mustila


Aboveall by Giuseppe De Marinis Gallo​ & ​​Gianluca Gnisci​​​


The Green Intervention by Minjae Kim &​​ Kwang Ja Oh​


Dear Landlord by Nile Greenberg​


Vertical Lilong by Luis Fco. Romero Martinez & Sandra Gomez Alba​


Colliding Lines and Lives by Sinan Gunay & Nurhayat Oz​​


Dachkiez,Village On The Roof​ by Sigurd Larsen, Simon Jendreizig, Vanessa Panagiotopoulou, Marlene Kjeldsen, Guillermo Fernandez Villar & Pedro Campos Altozano​

Explore the designs