The table (worldwide comparison) I attached is a bit dated, but I'm not sure how the proportions changed, but basically self storage space per capita in Europe (exl UK) is ~90 times smaller than in US. UK has around ~50% of self storage space in Europe and yet per capita self storage space is still 15 times larger in US. In Germany there is ~150 less self storage space per capita. (see the table I attached, this is 2015 data from European Association)
Does anyone have any idea why the market is so much smaller than in US?