Grand Duke Guillaume and Stéphanie Build a New Family Home in the Park of Berg Castle

The Grand Duke of Luxembourg, Guillaume, and his wife, Grand Duchess Stéphanie, have embarked on a personal and symbolic project — the construction of their new family home within the park of Berg Castle. The initiative marks a shift towards a more private family life for the future Grand Ducal couple, away from the grandeur of the castle that has long served as the residence of Luxembourg’s reigning sovereigns.

According to Norbert Becker, President of the Property Administration of HRH the Grand Duke, the project is progressing smoothly and remains on schedule. Construction began in the spring of 2024, and completion is expected by the summer of 2027. The new residence is being built on a 3,600 m² plot within the 22-hectare park of Berg Castle, in Colmar-Berg. Local residents have already been observing steady progress on-site since last year.

A Home for Family Life
Although Berg Castle, with its history dating back to the early 15th century, has been the traditional residence of Luxembourg’s sovereign since its restoration in 1964, Grand Duke Guillaume made a notable decision in July 2024: he and his family would not live in the vast, state-owned castle.

“We want our children to grow up in an intimate family environment,” Guillaume explained at the time. The construction of the new residence, he emphasized, is entirely financed by the couple’s personal resources — a choice reflecting their wish to balance their institutional responsibilities with a simpler, family-centered lifestyle.
Currently, the family resides at Fischbach Castle, the former home of Grand Duke Henri and Grand Duchess Maria Teresa. Their move to Colmar-Berg is envisaged for 2026, although no fixed date has been announced. In the interim, Guillaume and Stéphanie are expected to stay temporarily at Berg Castle until their new home is completed.

A Modest and Modern Design
Colmar-Berg Mayor Mandy Arendt confirmed that the project required a modification to the local development plan (PAG), which was approved in July 2024. The new home will be a single-family residence, designed with discretion and simplicity in mind. It will not exceed 9.5 meters in height or 17.5 meters including the basement, and — like many modern residences — it will also feature a bunker.

The decision to build within the park of Berg Castle symbolizes both continuity and renewal — keeping the Grand Ducal family close to the nation’s historic seat, while allowing them to create a personal and private space suited to modern family life.
By 2027, when the project is set to be completed, the Luxembourg royal family will open a new chapter — one that balances tradition, privacy, and progress at the heart of the Grand Duchy.

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