(with helpers, a total of 5 people), order a 10m³ container, fill it 13 times and done, right?
Hello illya
not quite yet. 130m³ is not the same as 130m³ in a container. You should rather calculate with 200m³. The excavation has the property of expanding when loosened. I filled 13 containers. But that was a different situation. I had to dig a pit next to the basement foundations. So first support it, then at first no excavator wanted to work on it, and then I just continued. For that, I had bought a dumper for 4,000 euros. Without that you stand no chance.
Long story short: I strongly advise you against it. Save on everything possible, but don't get involved in such an adventure. Even with 5 people you will need months to get this thing done.
Think about what you can do yourself.
THAT reminds me: Chiseling slots for the electricity. Maybe laying cables. I laid 4,500 meters of cables myself in my house. Saves enormously if the electrician cooperates.
Or you grout the tiles yourself.
Or you insulate the roof yourself.
There is a lot you can do yourself when building.
But digging out the basement yourself would not be my favorite.
Steven