The beginning point of all to-build decisions should be, "Why?"
Not how many rooms.
Because the most important part of the house is the person and their spirit which inhabits and reflects on the material world (Interiors, Allocation of space, Function and Size of spaces etc)
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I love using the example of the lowly because it covers everyone up the status rank.
Q. If i were a Cobbbler, how would i build my first house?
I would not declare it MUST be a 3 bedroom house. That would be a fatal mistake.
I would probably wish for a big tree to sit under.