Villa Kogelhof is designed based on complete autarky: therefore the house will be energy neutral. By using several techniques, the villa has a comfortable climate all seasons, whilst being extremely energy efficient. It was an important wish from our client to create a simple, abstract, yet spectacular villa. The result is a composition; consisting of two square stacked volumes: one underground and one floating above ground. It is designed as an uncompromising glass box, supported by a steel V-frame.
Architect: Angela Sondervan
Country: The Netherlands

Villa Kogelhof (2)
Villa Kogelhof (2)

The 25 hectare estate is part of a larger programme initiated by the government, which aims to connect regional ecological zones throughout the country. The current owner bought the site, once farmland, in 2006. It is a protected habitat for animals and plants and a major tourist draw in the area, open to the public. Permission to build a house on the land was given only on condition that it was returned to its pre-agricultural state. The planting of some 71,000 six-year-old trees hint at the future of the estate as ‘a villa in the woods’ and were planted already in 2006. A rectangular pond was digged, requiring the removal of 70,000 cubic metres of soil.
Villa Kogelhof (3)
Villa Kogelhof (3)

Contrast: The underground volume of the house consists the entrance, parking (for 6 cars and a tractor), storage, bathroom and a workspace which looks out over the pond. The living area is situated in the floating glass box above ground. It’s floor plan is completely open, except for some subtle glass room dividers. There are several separate volumes for the kitchen, bedrooms, bathroom and a multifunctional room. The patio has glass doors on both sides, so that it’s both accessible through the living room and the bathroom. The entire floor is covered with white epoxy and the furniture consists of designer classics from Le Corbusier and Eileen Gray. The façade is completely made out of glass and offers a spectacular view over the surrounding landscape.
Villa Kogelhof (4)
Villa Kogelhof (4)

Self-sufficient: One of the main principles of Villa Kogelhof was to translate luxury into the happiness of independence. The goal for the villa was to be self-sufficient; to generate its own energy, to heat its own water and to recycle the garbage. To make sure Villa Kogelhof is energy neutral, the façade offers an important contribution. This so called climate-façade is composed of an outer layer of clear insulated glass from floor to ceiling and an inner layer of sun-reflecting fabric that can be rolled up and unrolled. When the fabric is lowered, an air cavity is formed in which the air from the villa is extracted of a central ventilation system. The house is heated by a central heating system in combination with an air pump. Warm water will in the near future be generated by using a range stove, in which wood will be fired from the trees out of the private forest of the estate. Electricity is generated from the PV-cells on the roof and also from the planned windmill.
Villa Kogelhof (5)
Villa Kogelhof (5)

Client                                                      Private
Programme                                           Extremely energy-efficient, luxury villa
Location                                                 Noord-Beveland, the Netherlands
Design                                                    Paul de Ruiter Architects
Start design                                           October 2006
Start building period                           May 2009
Completion                                           January 2013
Gross floor area                                   715 m2
Volume                                                  2400 m3
Contractor                                             Bouwbedrijf Van de Linde, Goes
Advisor construction                           Broersma bv
Advisor building physics                     Smits van Burgst, Barendrecht
Advisor costs                                        Studio Bouwhaven, Barendrecht
Installations                                           InTec, Kapelle
Glas-engineering                                 Si-X, Benthuizen
Glasproducer                                        Thiele Glas, Germany
Base glass                                              Saint Gobain
Landscape architect                            Bosch Slabbers, Middelburg