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General and technical report

Back to a pre-agricultural era
The energy neutral, autarkic villa lies in the heart of a 250.000m2 farm estate, in the sea delta of Zeeland, which is designated as part of an ecological zone by the Dutch government. Permission to build a house on the land was given only on condition that it was returned to its pre-agricultural state. As a result 71,000 six-year-old indigenous trees were planted in 2006 and 70,000 cubic meters of soil were removed in order to create a pond for local flora and fauna.

The construction            
In order to make the horizontal white transparent glass box (40 by 8,5 meters) float 4 meters above the ground on the V-frame, the living volume is constructed as a bridge made out of two steel square trusses. The vertical columns of the trusses are intertwined with the domestic areas all placed into an open floor plan, leaving all the glass walls uninterrupted, allowing spectacular views over the sea and natural surroundings. The glass staircase connects the glass box with the perpendicular countersunk concrete volume underground. The pond on top of this volume subtly marks its presence in the landscape. One side of the concrete subterranean volume gives access to the parking garage, while the other side provides room for working and facilitates view over the wetlands.

Sustainable installations
Integrated minimalistic architectural detailing hides complex installation elements to guarantee optimal comfort and sustainability without disrupting the view. The villa is autarkic and energy neutral through long term heat/cold storage in the earth interacting with the climate-active façade. The façade, made out of 40 millimetres thick isolated glass and particularly developed for Villa Kogelhof, responds intelligently to the weather. Each glass plate consists of three layers with one layer of insulation in between. The system works via a central ventilation system, which extracts warm air from the air cavity, captures it in the heat-pump and is re-used for ventilation and water heating. This warmth is used in wintertime for heating, while cold air in wintertime is used for cooling the villa in the summer. Furthermore, the heat-pump also cools and heats the floor area without extra CO2 emission. A biomass power plant runs on leftover wood and solar cells on the roof generate the necessary electricity.

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