About building quality and plans and stuff. The Times has this piccie showing today’s snow etc:
That building in the foreground is The Circus. From one side it’s an architectural glory. But that view also shows you the back of the eastern side of it. Which is a hodgepodge of all sorts.
The design method was that the Adamses (think it was them, but no matter) organised the land and designed the frontage. Then the buyer of the house hired a jobbing builder to construct as they wished – as long as they accorded with the design for the frontage. Some things would be pretty much set by that frontage – height of piano nobile rooms, that sort of thing, window spacing, obviously. But other than that it’s as you wish (perhaps also worth noting that a basic design principle of the time was that the family/servants divide went vertically down the house. Basement and attic were servants, obviously, but of the other floors the back of the house was servants, the front family).