What does tirar la casa por la ventana mean?
Expression
to push the boat out
Spending without looking, usually on a one-off: a wedding, a refurbishment, a present. It nearly always turns up in the negative — sin tirar la casa por la ventana — to say that only what was needed got spent, which is precisely the message you want when you are showing somebody a flat.
Para la boda tiraron la casa por la ventana.
