Harjavalta Oy is a Finnish family enterprise founded in 1920 and is today a leading group of companies in the construction industry and a major employer in Finland. Harjavalta Group comprises Puustelli Group Oy, Kastelli Group Oy and Lapti Group Oy. In 2019, Harjavalta Group had a turnover of around €491 million and 1,200 permanent employees.

Puustelli Group Oy is a Finnish manufacturer of kitchen fittings, all of which it makes at its production facilities in Harjavalta. Puustelli is a full-service provider specialising in all-inclusive kitchen renovation.

  • Leading manufacturer of kitchen fittings in Finland
  • Innovator of ecological Miinus kitchens
  • Besides our own 39 dedicated full-service speciality stores in Finland, we have 11 in Sweden, 1 in Estonia and 5 in Russia

Kastelli Group Oy specialises in the manufacture of prefabricated single-family home and holiday home kits, and homes that are ready to move into.

  • Leading pre-fab home manufacturer in Finland
  • Annual delivery of more than 700 homes
  • Headquartered in Oulu
  • Operates throughout Finland


Lapti Group Oy is building services company specialising in the construction of new housing and service facilities. In addition to housing and service production, the company provides building services both integrated into its own construction projects and to external customers. Lapti Group is one of Finland’s fastest growing and most profitable housebuilding companies.

  • Employs 700 people, including those in subsidiaries
  • Offices in Joensuu, Kuopio, Jyväskylä, Tampere, Vantaa and Oulu
  • Operates throughout Finland