They already had a third bedroom - they just made it a bit longer.
I found myself wondering the other day how they managed to buy their house. I thought I remembered reading that it didn't have a working kitchen or bathroom. You can't mortgage a house like that, right? Usually banks get nervous lending money on a house that isn't actually liveable. I just went and looked on her blog and what she said (a year later) was this:
"Yes we lived in it from day 1, not really because it was actually liveable (we had no heating, gas pipes, or a working kitchen) but because we didn’t have a choice…all our money went on the mortgage."
How did 2 people without steady jobs get a mortgage on a house with no heating, gas or kitchen? I actually think they were probably loaned the entire amount they needed by (her?) family, and then took out a mortgage later for what they could borrow on their "incomes", once they had sorted the heating and kitchen. Must be nice eh?
The retainer thing, I have no words. It speaks volumes that she wrote "couldn't be bothered" before "couldn't afford it". Talk about weird priorities.