Cranny hole.

[Tony Glaser]

>>Now, do you ever use or see the word outside of them?
>
>As I remember, 'cranny hole' is a part of my vocabulary; this might be a
>dialectal isogloss that goes with the (now dead and gone) California use of
>'Chesterfield' for 'sofa'. I think of this as a difficult-to-use chunk of
>space in a building. This can include space under stairs

In England at least a space under the stairs could also be called a
"glory-hole" rather than "cranny hole".

Tony Glaser