I think the existing lean to kitchen has to go in any scenario. It looks like it is isn't far from falling down anyway.
FWIW I reckon at least part of it is original? Those kind of layouts with the kitchen at the back then an outhouse weren’t uncommon in Victorian and Edwardian stuff…right?
@Howard started
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I think the existing lean to kitchen has to go in any scenario. It looks like it is isn't far from falling down anyway.