Not to say there's not restaurants/bars open just as late or noisy, but fwiw I would say typically a pub in the UK would be the whole (vertical) building - room

Not to say there's not restaurants/bars open just as late or noisy, but fwiw I would say typically a pub in the UK would be the whole (vertical) building - rooms upstairs for staff or B&B, if not more seating for pub restaurant.