Building your own house is nowhere as difficult as most people would think - including me. My grandparents were from the generation that build their own house, it's still standing, though nobody lives there anymore.
I would imagine that the amount of money spent was insignificant, with the timber coming from their own land and basicly only locks, hinges, windows
and nails being bought from elsewhere.
But in reality I've grown up in such a different world that I would be quite lost if I tried something like that.
It's funny how a few generations ago every man basicly knew how to build the house for their family, now we know of quantum physics, astronomy and
geometry, but for shelter we need banks, mortages and armies of builders.