there are spells that keep the Sun shining on the house, and unseen forces that keep fog summoned by free magic away from the house. Theembodiment of the seventh bright shiner, Astarael, inhabits the well
There are three floors in Abhorsen's house proper, not including the tower which makes six.
In the cellar, there is a block of ice used to summon a flood from the Clayr's Glacier.
Ground Floor Edit
On the ground floor, there is a large garden outside, containing the well leading down to Astarael, and a Paperwing platform. Inside, there is the hall, the lower parlour (which is at the base of the tower), a store, a buttery, a kitchen, and stairs leading up and down.
Second floorEditOn the second floor, there are six small bedrooms, an armoury, and a workshop. There is also the upper parlour with stairs to the next level.
This is the highest proper floor, above is just the tower. There is the Abhorsen's bedroom, a music room, and stairs to the tower and roof gardens.
Here there is just the study, and outside are the roof gardens. A ladder leads to the top floor.
This is the top of the tower. The observatory is here, which has clear walls (not made of glass) allowing good vision.
Updates from the book 'Clariel' tell us there is also a secret room below the waterfall where Abhorsens kept free magic creatures prisoner for torture and interrogation. Also home to free magic creatures imprisoned and yet to be destroyed. It is likely that many floors below this area is where Kerrigor, in the form of a black cat, sleeps.