I get the room part, but it cost him 5000 pounds because he built it out of logs and straw bales. There's not really a massive supply network needed for that sort of thing.
Also, your idea of a decent house is (obviously) not necessarily his idea of a decent house (eg. he has a composting toilet), but it looks pretty warm and dry and vermin free to me.
Also, your idea of a decent house is (obviously) not necessarily his idea of a decent house (eg. he has a composting toilet), but it looks pretty warm and dry and vermin free to me.