Concrete Construction
Concrete Works for Demanding Environments
We build and repair concrete structures both on land and in water. Our special strength lies in hard-to-reach or challenging sites that require the combination of water construction and diving expertise. We deliver:
Comprehensive services from a single provider
Whether it’s an underwater construction site or an above-ground cast-in-place structure, we provide all concrete construction services reliably under one roof. Our professional divers and construction experts have decades of experience with demanding concrete structures – both above and below water.
Safety, quality, durability
Our operations are based on certified equipment, skilled personnel, and carefully planned work processes. We ensure site safety and manage environmental impacts – even underwater construction is carried out responsibly. We meet all obligations under the Contractor’s Liability Act, and our RALA certification guarantees quality and reliability.
Other services
Customer Testimonials
Veikka Välilehto
Site Manager, Oteran Oy“The work with Unwa Oy’s highly professional staff was carried out reliably and efficiently. Coordinating the schedules on the construction sites also went smoothly. We will certainly continue our cooperation in the future!”
Miika Mämmelä,
Ramago Oy“Working with Unwa Oy on-site has been completely seamless. The work is planned and carried out in a collaborative and positive spirit. Tasks are performed safely and with high quality, and working hours are used efficiently. Their strong work ethic is evident in everything they do!”
Samuel Ahokas
CEO, Laukaan Energia Oy“Cooperation with Unwa Oy has been extremely pleasant. The quality of work is excellent, and their performance inspires confidence. I want to build a long-term partnership with Unwa Oy!”
Harri Pouru
Maintenance Supervisor, City of Akaa“Collaboration with Unwa Oy has gone very well. The work has been completed according to the agreed schedule, and even though the project involved refurbishing an old guest marina pier, the cost estimates were very accurate.”
Aki Vanhala
Harbor Master, Jyväskylä Yacht Club (Jyväskylän Veneseura ry)“In June 2022, we carried out an inspection of mooring buoys and chains at the Juurikkasaari harbor of Jyväskylä Yacht Club. Unwa Oy performed the work with great professionalism and speed, and the inspection report was very detailed with photos and explanations. Later in the autumn, the necessary repairs were carried out, also by Unwa Oy, with the same high level of professionalism.”
Timo Pekkarinen
Site Manager, VMSV OY“Working with Unwa has been smooth. The work is efficient and professional!”
