Arkkitehtitoimisto KOAN Oy is a Helsinki-based architectural practice that combines a fresh design perspective with strong technical expertise. The office was founded by architects Marko Simsiö and Johannes Koskela.
Our core expertise lies in sustainable wooden architecture at various scales – from master planning to individual buildings. The office has designed several timber residential areas, public buildings, and private houses across Finland. Our work has been awarded and recognized in numerous architectural competitions.
We offer comprehensive design services tailored to the client’s needs, including architectural design, principal design, and interior design. We also have strong expertise in contemporary Building Information Modeling (BIM). We believe that the best results are achieved through active and innovative collaboration between all parties involved. We listen carefully to our clients’ aspirations while keeping cost-efficiency an integral part of the design process.
We strive to bring new perspectives to our work while respecting tradition and the spirit of place. Our design approach is always rooted in human-centered thinking and soft values.
OUR SERVICES
Architectural and principal design
(Arkkitehti- ja pääsuunnittelu)
Urban planning
Concept design
Restoration and refurbishment design
Interior design
Research and development
Architectural competitions
Visualizations
TEAM
Johannes Koskela
architect SAFA / M.sc.
founding partner
+358 400 768 960
Marko Simsiö
architect SAFA / M.sc.
founding partner
+358 45 694 0102

Juha Koskela, architect (M.sc.)
Karoliina Mäenpää, architect (M.sc.)
Heikki Savirinne, bachelor of architecture
Erika Siikaoja, architect (M.sc.)
Grecia Soria, business development specialist
Tanya Yliaho, architect (M.sc.), interior designer
OUR CLIENTS INCLUDE
Honkarakenne Oyj
Supercell Oy
S-Ryhmä / Osuuskauppa Keskimaa
City of Tampere
Municipality of Tuusula
Municipality of Kempele
Parish of Vihti
Kastelli-Talot Oy
Lapti Group Oy
TJD LLC
Hoivarakentajat Oy
Riisula-Rakennus Oy
Numerous private clients in Finland and abroad
If you are interested to hear more about us or to collaborate, please don't hesitate to contact us!
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