I've worked 5 years in construction industry when I was younger, building houses from scratch among other things. Before that I've spent a lot of time in my fat

I've worked 5 years in construction industry when I was younger, building houses from scratch among other things. Before that I've spent a lot of time in my father's workshop since I was like 5 years old, building things always came naturally to me. Even though it's not impossible, I would not advise you to build "a massive, concrete house" all by yourself. In fact it wouldn't even be possible. Details may vary from country to country, but you will need surveys, architect drawings, all kinds of permissions, material estimates and million other things and that's before you even start building anything. The building phase. Unlike in software there are a lot fewer "undos" in construction. If you end up screwing up the foundation the building might be condemned before you even put the roof on. So many things that can go wrong, I'd need a few days to make a list. You would need to think in advance about so many things it would make your head spin. Plumbing, electricity, insulation, etc. I could go on.