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Energy-neutral heritage

Renovation of a villa, Driebergen (Photo: Cornbread Works)
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Energy-neutral heritage

Energy-neutral heritage

DRIEBERGEN (NL) - Listed buildings are a valued part of a society's cultural heritage, but at the same time their high maintenance and energy costs, together with the many restrictions placed on alterations, can make them an onerous burden for their owners. It is clear that with both adaptive reuse and sustainability becoming increasingly important themes, there is an urgent need for new architectural solutions for these buildings. This renovation of a listed villa, a collaboration between Zecc Architecten and OPAi (oneplanetarchitecture institute, the knowledge centre of architect Thomas Rau), serves as an example for the future.

The high ambitions for the project began with the local authority which, rather than simply putting it up for sale, promised it to whoever could come up with the most sustainable renovation concept in combination with a reasonable offer. The prospective buyer (a foundation committed to sustainable renovation of historical buildings) consulted OPAi, who came up with the idea of an energy-neutral heritage building, the first in the Netherlands.

The big challenge facing the designers from Zecc was that for each and every intervention they had to strike a careful balance between the heritage quality of the building and the new energy concept. It was a form of integration for which no ready-made recipe existed and which in future, too, will have to be determined on a building-by-building basis.

Renovation of a villa, Driebergen (Photo: Cornbread Works)

With regard to the heritage value, it was decided to insulate the visually defining front elevation on the inside. At the back of the building the rear elevation and an annex were insulated from the outside. By making the secondary glazing larger than the existing frames, all the interventions remain visible. They have also been carried out in such a way that everything can later be returned to its original state, should opinions change.

Apart from good insulation, energy-neutrality was achieved through the installation of a heat pump (making use of geothermal energy), solar panels (for hot tap water and central heating) and photovoltaic panels on the roof at the rear (for electricity). The house is connected to the electricity grid; on dark days it draws power from it, while at other times it returns surplus electricity to the grid. (Kirsten Hannema)

Conversion, Ecocentric | Netherlands
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