The space plans of vernacular buildings are typically generic and general-purpose. The identical bays of three-aisled structures and the additive identical rooms of courtyard houses had been found to be the most inexpensively adaptable over time. Vernacular design is always prudent about materials and time, seeking the most pragmatic building for the least effort and cost. It provides an economical grammar of construction. Let there be a central passageway and stair hall, say, with roughly identical pairs of rooms on each side upstairs and down. (That was the “double pile” house that the
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