a basement
The room immediately beneath the roof is commonly called the attic.A small dome, lookout, or other structure on a roof is called a cupola.
We call an attic a room on top of a house.
A kitchen house is typically a room within your house that you call the kitchen. This is where you cook, prepare meals, and eat. However, "The Kitchen House" is also a book.
Parker
In Scotland, the term "pent" typically refers to the top floor or attic of a house. It could also be used to describe a small, cozy room or space within a house.
The term you might be looking for is Ridge.
An atrium is a room or entrance hall, rather than a house, which has a glass roof.
It is the laundry room
the selling room
book -room on the roof
An attic.
Basement