LichtAktiv Haus involves the modernization of a 1950s so-called settler house situated in the Wilhelmsburg district of Hamburg. The experiment shows how the vision of abundant natural light, fresh air and open views can be realized even in the most challenging modernization project. The aim is to combine optimum energy efficiency and the highest standards of livability in a home that operates on a carbon-neutral basis.

What makes the conceptual design of LichtAktiv Haus so unique is an innovative modernization strategy that combines maximum livability with optimum energy efficiency. The once closed structure of the existing building is transformed into spacious rooms flooded with light, providing occupants with the best livability. In the premium version, the two children’s rooms, the two bathrooms and the bedroom are located in the old house. With a so-called ‘daylight lamp’, the space under the roof is extended, creating a central living area and reading room which receives an optimum influx of natural light. The living environment also opens up horizontally thanks to a glass facade extending almost five meters in length and facing the garden. The window area has been increased overall from 18 m2 in the old building to 60 m2. An extension is added, offering space for the living and dining room, kitchen and utility room

A unique renovation project, LichtAktiv Haus transformed a box-like, closed structure into an open group of spacious rooms flooded with natural light. The LichtAktiv Haus can be realized in different variants - basic modernization and in modules according to financial ability, energetic ambition and need for extra square meters in the extension. 
 
The present building contains two children’s children's rooms, two bathrooms, a master bedroom, a central living area and a reading room. All rooms feature façade and roof windows that are positioned to ensure optimum distribution of natural light – and the home’s window area was increased from 18 m² to 60 m². Living area has been closed by a five-meters-long glass wall, which could be opened to the home’s garden. Everything is also extended for an open living room connected with a dining room. Also kitchen and utility room has been implemented here. Porch became a link between what is old and new. To provide electricity and hot water solar collectors and photovoltaic solar were used – everything to cover energy demands of the house.
 
The concept of LichtAktiv Haus was based on the "settler spirit", but instead of self-sufficiency in terms of food, the home is self-sufficient in terms of energy.

See some of the VELUX products used in house extensions below