Actually these are astonishingly cheap compared to a poor quality house in the UK. My parents bought an ex-rental unit to renovate at ~£100,000; it was single story (in the UK basements are virtually non-existent outside of cities) semi-detached and probably hung around 1,000 square feet of floor space. It was quite literally the cheapest house on the market in the area and it had nicotine stained walls, ceilings that seeped tar, had plumbing, gas and electrical problems. Not to mention one of the clauses for sale was that my parents dispose of all the junk in the house, which not only included bedrooms crammed full, but also a garage and a shed.

If you can get property in the UK and get the rights to put one of these sheds on, you'll probably save yourself anywhere between £25,000 and £100,000 on your lower end priced home.