Examples of storage and animal sheds. The sheds looked more or less the same regardless where in Finland they were located - at least in the wargamers point of view.

These are two-storey sheds. Most notable is that there are no windows in these, only small air vents. The ones used for storing grain could be lifted from the ground to prevent rats from entering it.

Then some plain storage sheds. Sheds were often quite low, one had to bend the go through the door and there might not be enough room to stand straight inside the shed.
These sheds have lumber roof. For modeling purposes, any of these could be turned into a sauna by adding a chimney to the roof.

Here's an example of a two-storey building. Judging from the doors, the lower part is used to keep animals. The upper floor is a storage space. The roof is made of shingles.
During summers the hirelings would move from the main building into the buildings in the courtyard.

This one is a storage building as much as the others, only that here the roof material is straws that are kept in place with sticks and small logs. Over time there would be growing all kinds of plants whose seeds the wind has blown there, but nothing was planted there on purpose.