They might have bought a "project house" and went the DIY route. Especially big country house, etc. In France I knew folks that bought a super cheap "small" castle, and have been constantly renovating for years and years. For example when up keeping the windows, by the time they get to the last one they can already start over with the first one again.
Same. I bought a fixer upper and haven't moved in yet due to the very messy renovations I'm doing slowly on evenings and weekends after my full-time job. I'm almost to the point I can move in though.