Loudon was a workaholic Scot w/no sense in investing or medicine. He wrote enormously on lots of things, especially gardening and all domestic design. Unusual interest in comfort & safety of all classes, several clever inventions - glasshouse frames, for instance. Gloag thinks his biggest legacy is the taste-neutral Vict. mishmash of design styles. I shall look for more on his gardening & by his wife, who was also a writer.
Update: Here's a plan for a whole farmstead, hosue and all, by Loudon; designed, among other things, to be built with small timber (like almost all US houses now) instead of masonry or big post-and-beam. Much attention to how the work gets done; lots of covered space built for drying washing or veg., windows in the sewing room, a whole complex of pits & gutters for different kinds of manure (and orchard trees in the enclosure with the barns: I wonder if the animals were let out to eat the windfalls, or if fruit was as vulnerable to theft as the animals).
If the text discussing "Expression" in the design of this cottage is Loudon's, he was certainly conscious of the "mishmash" of styles.
This circular wooden house is not by Loudon, but I had to throw it in because some of the construction details are so modernist - the cleanly-vanishing sash and blinds - and the floorplan actually looks pretty good.
So wrote clew in History (19th c.).