The Question and Answer section for The Glass Castle is a great resource to ask questions, find answers, and discuss the novel.
From the text:
We kids all slept in the middle room. At first we shared one big bed that had been left by the previous owner, but Dad decided we were getting a tad old for that. We were also too big to sleep in cardboard boxes, and there wasn't...
The bullies at school call her ugly, dirty and poor: Jeannette thinks they have a point.
I think that the house was dilapidated and unlivable without major fixes which they had no money for.