Onni Rakennus

Onni Rakennus Oy is a Finnish building contractor. Its core service is main contracting (pääurakointi), where it combines the agreed work, trades and site management into one project. It also offers project management contracting, subcontracting for construction companies, and construction supervision and project management through its Onni Valvonta service.

The company works with housing companies, property owners, businesses, developers and construction companies, as well as building consultants. For housing companies it manages energy renovations, including coordinating heating, building services and construction work and arranging energy calculations and energy certificates within the agreed project. Work is sold as defined contracts that set out scope, responsibilities, schedule and commercial terms. Onni Projektit serves private clients on larger renovations, extensions and new builds.

Onni Rakennus was founded in 2023 and is registered in Hyvinkää, Finland, which is also listed as its headquarters. The website is published in Finnish.

Product: Main contracting, project management contracting and subcontracting for building works, plus energy renovation management for housing companies