Foto: K. Funch

OS in an Copenhagen-based office founded by Olmo Ahlmann and Stine Christiansen

We are a small architectural firm specialized in sustainable architecture and large-scale urban plans. We view architecture and landscape as co-dependent. Sustainability is key to our practice. Both in the strategic and structural approach and in the beauty and viability of the detail.

Studio Recognition

Working Grant 2021 / Statens Kunstfond

Dreyers Legat 2021 / New offices grant

“House Built in Wood” Nominee for Building of the Year 2023, small scale, ArchDaily

Olmo Ahlmann

2016 / Building economics, MDB
2005 / Graduation, The Royal Danish Academy of Arts and Architecture
2003 / Student at Mackintosh, Glasgow School of Art

2021 / Founding Partner OS Architects
2005 -2021 employed at Vandkunsten architects
2005/ employed at Copenhagen Municipality, Plan and Architeture
2004 / employed at Plot architects

Stine Christiansen

2020 / DGNB konsultant
2018 / Climate adaption solutions educations. Teknological Institute, DK
2008 /Graduation, The Royal Danish Academy of Arts and Architecture


2021 / Teaching at The Royal Danish Academy of Arts and Architecture 

2021 / Founding partner OS
2010 -2021 employed at Vandkunsten architects
2005 –09 / Founding partner Spektrum architects, Denmark
200/ Intern, Shigeru Ban Architects, Tokyo, Japan
2005 / Student. SLA, Kbh.

2004/ Intern, Peter Eisenman architects, New York

2000/ Art studies- Arts students, League New York