Berlin – Veilchen- and Hyazinthenstraße

Two Berlin apartment buildings at Veilchenstraße 4, 5 and Hyazinthenstraße 2, with a total of 21 residential units (approx. 1043 m²), are undergoing comprehensive energy-efficient modernization through serial renovation and the use of renewable energy sources. Built in 1954, these buildings currently have a low energy efficiency rating, but after the planned measures, they will achieve energy savings of over 70%.

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Specifically, final energy consumption will be reduced by 112.0 kWh/(m²∙a) and primary energy demand by 181.5 kWh/(m²∙a). The significant reduction in CO₂ emissions is due to the use of district heating and photovoltaic systems. The serial renovation method ensures a fast, cost-effective implementation with minimal disruption to residents.

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Overview of Measures

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The renovation includes a new, highly insulated building envelope with prefabricated façade elements and modern windows, insulation of the roof and basement ceiling, and the installation of a photovoltaic system for on-site electricity generation. The concept is supplemented by decentralized ventilation systems with heat recovery and the replacement of all thermostat valves, while the existing district heating supply and hot water systems remain in place.

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Building Data

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Building class 4 | full floors 3 | residential units 21 | living space 1043 m² | built in 1954