SLETH is an office of architecture and urban planning. Our main focus is architecture related to urban development.
Our services range from concepts and ideas to the execution of urban planning and construction projects.
Since the beginning of 2006 the team has stood out on several occasions, winning prizes and distinctions.
Right now we are completing projects – ranging from design to urban planning.
The office continuously participates in architectural competitions and research projects. We collaborate with colleagues and academic institutions as an important part of our professional development.
We are operating projects that range geographically and by type, working with public and private organizations as well as privately held companies and independent constructors.
SLETH was founded in 2006 and is being led by architects Søren Leth and Rasmus Therkildsen. 
We are based in Denmark with offices in Aarhus and Copenhagen.


14 06 The People Meeting - Folkemødet 2014.  SLETH is participating in Denmark’s Political Festival on Bornholm. SLETH is leading the Green State scenario workshop and joining the public debate as part of the DK2050 project.  

14 05 SLETH is returning to the Venice Biennale! The office will contribute to discussions about Denmarks sustainability goals in relation to planning and architecture.

14 05 1.Prize Steelscape Frederiksværk. SLETH is chosen as the final winner in the invited competition for revitalizing the urban spaces and cultural heritage of Frederiksværk. To see full project click here.

14 04 DK 2050. SLETH is selected as one of 4 offices to develop future scenarios for a CO2 neutral Denmark in 2050.

13 12 Steelscape Frederiksvaerk. SLETH is chosen for 2nd phase of the invited competition for the development of the urban spaces for the town with the rich cultural industrial heritage.

13 12 Pollutec Paris. SLETH is participating in a panel debate around the theme sustainable urban planning at the french fair Pollutec in Paris.

13 11 Sprout at DAC. SLETH is speaking about temporary elements in urban planning.

13 10 Sonnesgade 1:1. Today on October the 1.-  on the day of the architecture, we are proud to exhibit and present our development project in Sonnesgade in the city of Aarhus. See more in the project list.

13 09 2. Prize Hillerød South. SLETH receives a 2nd prize in the open architectural competition for the southern expansion of the city of Hillerød.

13 06 1. Prize Tønder Townhall. SLETH is chosen as final winner in the open architectural competition for the townhall extension in Tønder.

13 06 SUMMERPARTY + EXHIBITION. The 21 of june in collaboration with the Aarhus School of Architecture. Constructing an Archive in Sonnesgade 11. Aarhus.

13 06 On the move. SLETH presents The Mobile Art Pavillon in an exhibition in the Townhall of Aarhus during June 01-10.

13 05 Speaking about density! Lars and Søren are speaking at the Danish Association of Cityplanners annual conference - this year debating the subject Density.

13 05 SLETH receives the Danish Arts Foundation Grant 2013

13 05 SLAKT - ideas for the Slaugtherhouse area at the Southharbour of Aarhus are presented in the SLAKT book.

13 05 Islev Id!  SLETH is participating in the public meeting about the future of Islev in Rødovre debating our winning Europan proposal Islev Id.

13 03 SLETH is speaking at the Dutch Renovation Platform seminar at the Dutch Embassy in Copenhagen.

13 02 SLETH wins the competition for the rethinking of Hersted Industrial area in Copenhagen in cooperation with Kristine Jensens Tegnestue and Norconsult.


CVR-nr. 32154557

At the moment we have no vacancies. We are constantly interested in meeting talented and dedicated people. 
Feel free to send us a mail with a couple of words and a pdf portefolio at

For inquiries please call us at the office or write to

Rasmus Therkildsen
Architect MAA

Søren Leth 
Architect MAA

Lars Jensen
Team leader Copenhagen Office
Architect MAA


Jægergårdsgade 152, 03E
8000 Aarhus C
Tel +45 32111001

Trangravsvej 6 (1.floor)
1436 København K
Tel +45 32131001