Renting an excavator, doing it yourself?!
I don't think we can do that. Even if I knew which excavator to rent, I wouldn’t know which pipes to buy, nor how to connect pipes, nor anything else about the topic. We’re happy if we manage to get wallpapered and have shelves screwed to the wall.
That’s how it goes in construction... unfortunately.
Ask the general contractor where else they have applied flat rates that need to be checked.
The rest is largely complete. Most flat rates were actually calculated generously. That was only the rough cost planning where the general contractor supported us, basically everything that falls under incidental costs. These are not necessarily works the general contractor participates in. We only requested one offer from them for that. The price just surprised me because all other costs in this statement, which were sort of "rough estimates," were actually very well calculated. I’m not blaming the general contractor for that now.