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Helin + Siitonen : Architecture

Contemporary Finnish Architect Practice. Helsinki Design Studio Information

post updated 28 March 2026

Helin + Siitonen – Key Projects

This Finnish Architecture Practice has since been retitled as Helin & Co Architects, in 1999.

Key Architecture Projects by Helin + Siitonen, alphabetical:

Nokia Headquarters, Espoo, near Helsinki, Finland
Date built: 1998

photo Villeke, CC BY-SA 3.0 https://creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons

The Nokia House was the head office building of Nokia Corporation, located in Keilaniemi, Espoo. The two southernmost parts of the building were built in the early 1990s and the third, northernmost part was built in 2000. Around 5000 employees work in the premises.
In 2012, Nokia announced that it had sold its head office building to Finland-based Exilion for €170 million and was leasing it back on a long-term basis. The building was later sold to Microsoft as part of the sale of the mobile phone business in 2014 and renamed to Microsoft Talo. Since the sale, Nokia’s headquarters are in Karaportti, Espoo, Finland.

Parliament Extension, district of Töölö, Helsinki, Finland
Date built: 2004
Design: Helin & Co
The Finnish Parliament Annex (Finnish: Pikkuparlamentti) is a building in the centre of Helsinki, Finland. It houses offices for about one hundred members of the Parliament of Finland.

The building was built in 2004 and the design comes from the winning entry of a design competition held from 1998 to 2000. The building was designed by the architect Pekka Helin and his office Helin & Co.

As well as the offices, the building has a “Kansalaisinfo” information office open to the public. It also contains the EU secretariat of the Parliament, the office of the Parliamentary Ombudsman, and the offices of the Grand Committee and Foreign Affairs Committee of the Parliament.

More architecture design projects online soon

Location: Helsinki, Finland, northeast Europe.

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Finnish Architecture Practice Information

Architects Office Information

Finnish architect studio led by Pekka Helin

1979-1999, since renamed

Context:
Building near to the Nokia HQ:

Key Architectural Awards won by this Finnish architecture office

• The 10th European Urban and Regional Planning Award 2014 (Fornebu)
• Iconic Awards Architecture 2013 (Metsä Wood Group and MELA Headquarters)
• The Single Family Houses Through the Ages, winner 2012 (Villa Krona)
• European Award for Steelstructures 2007 (Kamppi Centre)
• Roof of the Year 2006 (Alberga Area Centre and Sello Commercial Centre)
• Steel Construction of the Year 2006 (Kamppi Centre)
• Wood Construction Prize 2006 (Finnforest Modular Office)
• Steel Construction of the Year 2004 (Parliament House Annexe)
• Sustainable Building of the Year 2001 (Nordea Office Aleksis Kiven katu 9)

House Moby Dick, Espoo
2003
Design: Arkkitehdit NRT

photo from architect
House Moby Dick

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Helin + Siitonen Architects was a Finnish architectural partnership established in the 1970s by architects Pekka Helin and Tuomo Siitonen, active mainly from the 1970s through the 1990s. The firm played an influential role in Finnish architecture, contributing to major projects that combined thoughtful design with sensitivity to context and function.

Overview:

Helin + Siitonen Architects was based in Helsinki, Finland, and became known for significant public and commercial buildings as well as housing projects. Their work often explored modernist principles with careful attention to materials and spatial quality.

In 1999 the practice evolved into Helin & Co Architects, led by Pekka Helin, continuing the legacy with award‑winning buildings and designs across Finland and internationally.

Notable Projects:

– Nokia House (Espoo, Finland) – A major corporate headquarters designed through an invited competition, noted for its planning and integration with the surrounding landscape.

– Joensuu Library (Finland) – A culturally significant library building designed by Pekka Helin and Tuomo Siitonen that contributes to the urban heart of Joensuu.
Experimental Housing in Borås (Sweden) – A residential project that responds to landscape and community with innovative forms.