I was told by a social historian that the historu of the kitchen goes like this;
in working class / ordinary homes, food prep was done in the main living area, but in rural areas, there would be an outside (or outhouse / scullery) for basic food prep - washing mud off vegetables, plucking / gutting animals etc.
Posher town houses had sculleries for prep and kitchens for cooking.
When servants went out of fashion, middle class women thought it 'common'to be seen prepping & cooking, so they wanted small kitchens (1930s). However, as more middle class women went back to work (working class never stopped of course!) and children played out less, families began to want larger kitchens so life could go on around the cook. The 'farmhouse' kitchen came back into vogue. He recalled that as a working class boy in the 30s, he did his homework in the 'parlour' quietly on his own. By the 60s, he and his wife got the children to do their homework in the kitchen so they could keep an eye on them whilst they cooked.