New build project showcasing VELUX roof windows - historical building near Essen
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New build project showcasing VELUX roof windows - historical building near Essen - site plan
Architect: Sigurd Larsen Design & Architecture Berlin

The Dortmannhof is an outstanding building: located on the grounds of the famous Zeche Zollverein, known for its cultural role and exceptional modern architecture, nevertheless from its construction in 1791 used for habitation and agricultural purposes.

Meanwhile, one of the few of its type, combining apartments and barn, connected by a central entrance, under one roof.

Two musicians fell in love with the building while looking for a place to live, play music and accommodate guests, and decided to fulfil their house dreams there. The task was not easy, as the entire volume stands under strict protection laws.

Their search for innovative offices lead them to Sigurd Larsen, whos Danish ""Roofhouse"" – all focused from light from above – was internationally acclaimed and awarded.

The restrictions were much more challenging than in an average project, as the volume and facades had to remain intact. The limits on what was allowed were very rigid, the process – with lots of authorities involved – took over two years.

Local regulations allowed only for the addition of two little roof windows, no outside insulation, and no additional openings.

The challenge has led to an exceptional, innovative solution, for both the architects and clients recognized the beauty of the historic building.

New build project showcasing VELUX roof windows - historical building near Essen
Architect: Sigurd Larsen Design & Architecture Berlin; Photos: Christian Flatscher

Sigurd Larsen

architect at Sigurd Larsen Design & Architecture Berlin

The historic building is comprised of several entrances and internal connections which allowed for various farming activities to occur simultaneously. These features have been retained, allowing family life, creativity and work to coexist in a similar spirit

New build project showcasing VELUX roof windows - historical building near Essen
Architect: Sigurd Larsen Design & Architecture Berlin; Photos: Christian Flatscher

The architects did not insulate the entire volume, only the parts meant for habitation.The reasons for it were not entirely economic and ecological: this solution also allowed for keeping old, beautiful structures visible. As the original, beautiful dark stone flooring has been kept, the house is heated with a couple of traditional heaters.

Thanks to modern windows the new part is warmer than the old one in the wintertime – while the stale, hot air is exhausted through the roof. The position of VELUX windows high in the volume ensures optimal air circulation.

Designed volumes turned out to be a perfect solution for all the issues: no additional acoustic measures were needed in the music rooms, as no walls are parallel.

The fire insulation issue was solved by adding fireproof Fermacell cladding on wooden construction.

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New build project showcasing VELUX roof windows - historical building near Essen
Architect: Sigurd Larsen Design & Architecture Berlin; Photos: Christian Flatscher

The projects resembles a miniature village inside the historical volume: the courtyards and patios between the volumes allow for a multitude of ways between the spaces, enlarging the living area in warmer months.

The clients needed a music room with space for a small audience, an apartment as well as a separate unit for guests.

A labyrinth-like structure of the house, with all its shortcuts, was kept. The barn and haystack were replaced with striking, new rooms, yet many ancient elements – even feeding troughs were kept and integrated into the walls.

VELUX Products used in this case
VELUX INTEGRA® electric and solar powered roof windows
VELUX INTEGRA® electric and solar powered roof windows
Product details

Project details

Year:  Dortmannof 1791, internal extension completed 2020
Location: Essen, Germany
Architect:  Sigrud Larsen Design & Architecture, Berlin
Area:  350 sqm
Photos: Christian Flatscher