That would be unusual in the UK. The word "apartment" implies separate living quarters from main house.
I thought that in UK and US English "apartment" implied living quarters separate (apart) from other sections (living quarters or in this case a garage) in the same building. When I was a kid we lived in a 3 floor house divided into a 2 floor maisonette above a ground floor flat.
Are you aware that the building in the picture I posted is an American one, which is a substantial garage with an apartment above it? That is, it isn't a "main house".