Ewert Janssen

Ewert Janssen or Evert Janssen (died c. 1692) was a Danish architect who became a royal masterbuilder in 1668. His greatest achievement was Charlottenborg Palace in Copenhagen.

Ewert Janssen, along with Ernst Brandenburger a few years later, was one of the great masterbuilders of the absolute monarchy which, instituted by Frederick III, played an important part in supporting architectural developments.

In 1665, Janssen completed his first major achievement with a connecting stairway at the medieval Gjorslev Castle in the south of Sealand. It appears to have been copied from an earlier design by Dutch architect Philips Vingboons.

After his appointment as royal masterbuilder in 1668, he prepared a number of drawings showing how Skanderborg Castle could, for a reasonably small sum, be adapted to the style of the period, possibly for the use of Crown Princess Charlotte Amalie. The work was, however, not carried out.

His original drawings for Charlottenborg Palace appear once again to have been based on Vingboom's plans for Amsterdam's city hall which is now the royal residence. It was only thanks to Lambert van Haven's significant alterations that the building has a style of its own. Nevertheless, it is considered to be one of Denmark's architectural masterpieces.

Janssen is also credited with the design of several manor houses in southern Sealand, the most impressive being Nysø Manor, the first Baroque building of its kind in Denmark.

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