The architecture of the castle was inspired by Renaissance castles in the Mälaren Valley, which syncretised native elements with the Palladian style, while the location on a hilltop emulated castles in the Rhine Valley. Brahehus consisted of a square main building with a side of , as well as two spired side towers, one to the north and one to the south, each connected to the main building by a side wall.
The architecture of the castle was inspired by Renaissance castles in the Mälaren Valley, which combined local features with the Palladian style, while the location on a hilltop emulated those found in the Rhine Valley. Brahehus consisted of a square main building with a courtyard, as well as two spired side towers, one to the north and one to the south, each connected to the main building by a side wall.