The original size of the core castle is unknown, but it must have been at least three times the size of the area preserved today. The core castle was surrounded by a two-metre-wide circular wall. In front of it was a 14-metre-wide moat dug into the rock. The buildings connected to the curtain wall on the inside are farm buildings and towers that were rebuilt several times and were only erected in the second half of the 12th century.
The excavated walls were fortified, partially completed and left in their current state, even if they appear to be adjacent to walls that did not originally exist at the same time.