Build a terraced end house with an additional unit (GÜ) on your own

He cannot invoke the hammer stroke right [Hammerschlagrecht], as it happened without the required two-week notice. A charge of trespassing would be possible. But your lawyer has surely already checked that.

Without existing fencing or a given prohibition, trespassing is in my opinion difficult.

The hammer stroke right [Hammerschlagrecht] is not a “dig up and tear open” right.

We prohibited the neighbors in two emails from carrying out any work on our property or any interception without consent, - the last time about three weeks before excavation - including the shell builder, architect, and civil engineer, as well as in the presence of witnesses on the day of excavation.

Therefore, the preliminary injunction was fully granted because everything is verifiably documented without gaps.

And the civil engineer just started, exposed your rainwater downpipe and dug up half of your terrace "because he needs the space to work"? Even though he received an email from you beforehand, in which you clearly forbade this without being explicitly asked for permission first? Wow..... I would probably fly off the handle too.

What actually happens now after the injunction? I’m not very familiar with this. So first of all, construction stop, that’s clear. What has to happen then for the neighbor to be allowed to continue? And what if he continues anyway? Then you could call the police because of the injunction, right?

I would start thinking about privacy screens now. You don’t want to see such annoying brats.

why work areas are not generally set up "at the back or front" of a still undeveloped plot but in your case on the left or right, i.e. at a place where houses already stand? Does that have practical reasons?

The "work area" does not refer to a construction site accommodation (or what do you imagine by that?), but to the trench around the foundation in which the workers form the cellar walls. There are techniques developed for large construction sites and almost only suitable there, to work with a "zero boundary distance", but the "practical reasons" are my main motive to classify building a middle house last among the highest categories of hard penal labor. A drive with which a crane can be swung by a few arcseconds is unaffordable for a small construction site.

Building the middle house last falls into the highest category of serious penalty tasks.

But this will definitely happen more often and if so, how should that have been prevented? Especially when, for example, years lie between the individual houses?