The outer form of today's castle building goes back to Truchsess Jakob (1546-1589) and his wife Johanna (1548-1613). In the years that followed, they had it rebuilt from scratch in place of the one that had been destroyed by a chimney fire in 1578 and, as Zimmer's chronicle says, "a bewildered building made of wood and frame work".
In the powerful, regular four-wing complex with the protruding corner towers, contemporary demands for living comfort and representation could finally be realized. The functional rooms were on the ground floor, the guest apartments were on the first floor and above them the living quarters of the count's couple. The highlight of a series of representative rooms is the main hall on the second floor of the west wing, the knight's hall, at the end of the main staircase rising from the portal hall. In front of this are the banquet hall and the picture room in the north wing.
The building did not last long. On December 28, 1646, the troops of the Swedish Field Marshal Wrangel set it on fire during one of their campaigns through the Uplands. Although parts of the castle were preserved, the top floor in particular - and thus the main floor - went up in flames. The beginning of the reconstruction work was delayed until 1651 due to the hardship of the post-war period. The decisive phase in the furnishing of the representative rooms fell between 1691 and 1700. The leadership in the redesign of the representative rooms, both in terms of the stucco and the equipment As for sculptures, it was in the hands of the sculptor and plasterer Balthasar Krimmer (1653-1702) from Wangen.
Drastic structural changes took place in the first half of the 18th century, when the guest apartments on the first floor were redesigned in Rococo style. In the late 19th century, a series of dining rooms were designed in keeping with the taste of the time. At that time, the palace chapel also received its neo-Gothic appearance. With the completion of the Gothic room, the adjoining rooms and the corridor at the end of the 19th century, the conversion work at Wolfegg Castle was complete.