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Oy Julius Tallberg Ab / Aleksanterinkatu 21


11,873 m²


Oy Julius Tallberg Ab


Aleksanterinkatu 21, Helsinki


8% Energy Savings and 20.9% Return on Investment


Energy renovation including expansion of building automation and modernization of the ventilation system, construction of a photovoltaic system, overhaul of basement lighting controls


Estimated cost savings of €487,000 and reduction of 1,400 tonnes of CO2 emissions over the life cycle of the property

Aleksanterinkatu 21 is an iconic building in the center of Helsinki. It is both protected by the National Board of Antiquities and technically complex. These special features were taken into account when EcoReal carried out an energy audit at the site in the summer of 2019, which was used to identify economically viable measures to improve the property’s energy efficiency. Based on the proposed measures resulting from the review, Oy Julius Tallberg Ab and EcoReal agreed to implement the energy renovation via a project management contract, which covered everything from design to handover and included energy subsidy applications, building permits, and a one-year monitoring and optimization period.

In city center properties, the limited amount of space can cause challenges for the installation of new building services systems, but in Aleksanterinkatu 21, space was found for the photovoltaic system on the building’s rooftop. In addition, extensive features were implemented in the building automation system and the ventilation was modernized. In the basement, the lighting control was modernized by adding motion detectors.

The site’s energy renovation was a technically challenging undertaking, and the initial spring of coronavirus created exceptional conditions for implementation. In an old property, you may come across surprises during the design and implementation phases. In this case, the ability to anticipate and react to unexpected situations quickly and flexibly is critical.

“Building technology in general is predictable, but solar panels posed an additional challenge for project management due to building protection regulations. Eventually, installation of the solar panels on the sloped roof went smoothly. We thank the City of Helsinki’s Building Control Services for the relevant permit approvals, ”says Jii Van, EcoReal’s Project Manager.

“As a client, we received all the necessary services effortlessly and transparently through one contract partner. The energy renovation was carried out expertly as a project management contract, and we are very satisfied with the result, ”says Kimmo Okker, Property Manager at Oy Julius Tallberg Ab.