Renovation Projects

We provide professional structural design, construction management, and site supervision for demanding and exceptionally demanding renovation, extension, and alteration projects.

NODETEC’s renovation specialists have extensive experience ranging from 19th-century buildings (SR1, SR2, SR3 security ratings) to 21st-century design projects. Whenever suitable, we utilize Building Information Modeling (BIM) in our renovation design processes.

Explore the service

Structural Design

Renovation projects require a structural designer to possess in-depth knowledge of the existing building stock, strong professional skills, and the ability to understand how existing structures perform. Structural modifications, reinforcement, and adapting to new uses demand careful planning and experience. We specialize in demanding renovation design. Read more about our structural design services here.

Construction Management

Our construction management service ensures smooth progress throughout the renovation project and provides expert oversight for the entire process. We emphasize efficient coordination and collaboration between all parties to ensure that the project advances in line with the set objectives. Read more about our construction management services here.

Structural design

Janne Hellsten

Design director, partner
+358 40 528 8816

I have experience in structural design since 2009. My first design assignments were the design of concrete elements and residential apartment buildings. Since 2012, I have been involved in large renovation projects, such as the renovation of the Olympic Stadium and the OP Vallila headquarters. In the industrial sector, I have worked as a structural designer in several large projects in which I have designed exceptionally demanding concrete and steel frames and special structures such as underground high pressure walls. Examples of such projects include the Kaitaan metroasema (Länsimetro), the Finnoon Pumping Station and the Turun Wastewater Treatment Plant. In recent years, I have been responsible for the structural design of large renovation and modification projects in high-value properties in a prime locations in Helsinki.
In addition to project work, I am the head of the structural unit and work in the company's development and strategy.

Expertise: Concrete and steel structures, Renovation projects, FEM

Certifications & Achievements:
• M.Sc. in Building Technology
• Over 15 years of experience in structural engineering and BIM
• Founding Partner of Nodetec (since 2017)

Outside the office, I have the opportunity to develop communication skills and learn to create a good team spirit by spending time with my wife and two children.

Janne Hellsten
Co-Founder & Structural Engineer, Manager of Kotka Office
Nodetec Oy

Antti Wallenius

Project lead, construction and supervision
+358 41 545 6261

As a construction management consultant, I am responsible for project management, which includes overseeing various design disciplines, schedule and cost monitoring, and contractor procurement. I have particular expertise in managing facade, deck, and roof renovations. With seven years of experience in construction consulting, I bring the added benefit of a strong background in structural design. My experience also extends internationally, having worked as a structural designer in New Zealand for approximately two years.

Expertise: Renovation construction and property development

Certifications & Achievements:
Master of Science (Technology) – Building Technology
Aalto University – School of Engineering

I am driven by a constant desire to learn and grow. In my free time, I enjoy an active lifestyle, including cycling, surfing, and hiking. To balance my activity, I also enjoy reading.

Antti Wallenius
Project lead, Construction Management and Consultancy Services
Nodetec Oy