Following up to Martin :

The Dutch put up sheds on their allotments and use them as summer houses.

They do that in Austria too - Schräbergarten. Intended as a small patch of
green for gardenless city-dwellers, where they can get away from the
rat-race, they now have to keep up with the Joneses in the patch next door.
Who's got the biggest/best hut, how many beds(yes, really).
--
Tim C.