In the UK the rules on sheds and structures are controlled by the local council. Often they set a maximum size, but I suspect they aren't measured unless you piss off someone enough to complain.
There was a movement in the late 1890s-1930s where building societies would buy strips of land to allow the working man to take out a loan to buy and build on a plot of land, with enough space to grow and keep livestock. I wish I knew what they were called. Basically they were allotments with houses.
In the netherlands Tuinhuisen are a thing, and they put a lot of effort into making them look nice and be livable.
In the UK the rules on sheds and structures are controlled by the local council. Often they set a maximum size, but I suspect they aren't measured unless you piss off someone enough to complain.
There was a movement in the late 1890s-1930s where building societies would buy strips of land to allow the working man to take out a loan to buy and build on a plot of land, with enough space to grow and keep livestock. I wish I knew what they were called. Basically they were allotments with houses.
In the netherlands Tuinhuisen are a thing, and they put a lot of effort into making them look nice and be livable.