My visit to Versailles many years ago confronted me with an alien concept of interior architecture: everything was a large hall, including the bedchambers, and getting to another part of the palace required passing through all these spaces that in a modern building would be rooms separated off of access hallways.
Wikipedia implies that the concept of separate rooms and halls as we know them didn't develop until sometime during or after the middle ages:
In a medieval building, the hall was where the fire was kept. With time, its functions as dormitory, kitchen, parlour and so on were divided off to separate rooms or, in the case of the kitchen, a separate building.
This is painfully vague though. When did it become normal in Europe for upper-class buildings' interior to be composed of separate rooms off a main hall instead of a single multi-function grand hall? Or, to state the question differently, when did the multi-function grand hall that served as dormitory, kitchen, reception hall become uncommon and antiquated? Accuracy to the century, or the span of transition centuries, is plenty for my purposes.