Ultra mods.
We're in Bieldside on a 1/3 acre plot.
I was told by a director of a large house building company, that owns land adjacent to ours that, it is £1m/ acre.
The actual cottage is tiny, in poor condition and house insurance would see a rebuild cost of £70k.
Our cottage sits in development land but the rest of the plot is green belt :-( and so your suggestion can't be done :-(