In another life, 50 years ago, I was very friendly with girl whose house only had an outside one, like most in Handsworth at that time. The family normally lived in what was the kitchen, although they had gone posh and had a lean-to scullery with sink, washtub and perhaps cooker - I forget now. Only on special occasions would they sit in 'the house', where Mary had to do her piano practice.
They were a very set family, dad always sat quietly next to the fire (which was always burning) with his paper and smoking his Erinmore baccy, while mum would be talking and working. Occasionally he would get up, go out and return a minute later. Above the back of his chair was a nail with a cap hanging on it. Once a day he would put it on when he got out of his chair, which was a public sign that bhe wouldn't be back for five minutes.
Peter