“Attic” has several usages. Traditionally it is a habitable story between the eaves and roof. An analog to a basement.

In a lot of contemporary construction it is an uninhabitable space between the eaves and roof. An analog to a crawl space.

In contemporary construction, habitable attics usually get listed as bonus rooms.

The GP is thinking of something reached by stairs. Nonhabitable attics usually are accessed by ladders or ladder like objects.