Assigning trades yourself - what can be saved by doing so?

but the site manager, you can basically do without after building 3 houses. Or not?

See the State Building Code, Saxony, § 56(2) The site manager must have the expertise and experience required for his task. [...] There is more about the duties of the site manager (and the builder).

Especially when I read about the East German times...
A lot has changed in construction over the last 30 years, so I find it daring to speak of "experience".

The trades have changed little - rather the materials, right?

See the State Building Code, Saxony, § 56(2) The site manager must have the expertise and experience required for his task. [...]

There is more information about the duties of the site manager (and the client).

Oh, I didn't know that at all. I really find that so typically German. You're not allowed to...

The trades have changed little - rather the materials, right?

Sure, the trades have remained the same. But how do you expect to assess, with the experience from 30 years ago, whether the materials used now are the right ones and are installed according to regulations?

Oh, I didn’t know that at all. Well, I find that really so typically German again. You’re not allowed to...

In the end, that just means you need someone who puts his Kaiser Wilhelm underneath it. Similar to us, since I am not a master electrician, but still did everything myself...

Awarding the trades should not be the problem. We are also considering this because we have craft businesses here that we have known for years and to whom we would now also like to give "something big" in the construction of our house. I think the problem is more the acceptance. I do not dare to assess whether the trade has been carried out professionally and meets all requirements.