The smallest of all floors, there are only a handful of classrooms and storage rooms here, as most other space is taken up by the tower of House Dranaga and the rather large Headmaster's office constructed by founder Griffith Virell himself. This floor enjoys the most gorgeous views out over the grounds and the valley below, and has the most natural light.

Built from hardened limestone, the third floor of Penwick Castle has a warm and inviting yellowish tint and features plenty of natural light. There are several classrooms and study rooms on this floor, and in the eastern wing, there is a great, long gallery full of portraits of tenured Penwick students and other significant people.

There are many suits of armour in the hallways on the second floor, rumoured to be guarding a great treasure, which often results in nightly escapades and subsequent detentions. Yet some insist that the rumours are true and that Mercator hid something of great value here.

The air is noticeably cool on the first floor, and the light is a little dimmer here than on other floors, though not as dim as the Subterranium. The air is a bit damp here, and some say that's why ghosts can often be found on this floor.

A grand entrance indeed, the ground floor tallest individual floor of Penwick Castle. Voices echo off the arched stone ceilings and marbled floors. This is the central hub of the student body.

This part of the castle sits below the ground level of the castle and is dug into the mountainous rock upon which Penwick stands. The subterranium has several levels of its own, and spiralling staircases lead all the way down to sloping grounds and riverside that border the school.