Data protection at the building authority - (not) an issue?

And in this case it was done in writing and accompanied by a legal remedy instruction against which an objection can be filed. What is supposed to not be an administrative act about that?

That is an administrative act. Basically, even setting the marking itself is one. An AA is always the decision of an authority […]. A citizen can always take action against that if they think it is wrong.

But the appointment itself is not an AA, as it is not a decision in itself. I know, it's not that simple. But if you haven't understood it, you shouldn't pretend as if you have swallowed the wisdom of public law by the spoonful.

Sorry if I don't bring the nuances of German administrative law closer to the broad readership here. Which they will probably never have to deal with again.

I apologize. But if the broad readership never has to deal with administrative law and administrative acts again, I will eat a broom every morning for the rest of my life.

So, now back to the topic: the building authority is also drilled in the area of data protection. It is very likely to be assumed that the announcement is legally okay. Otherwise, if in doubt, simply write to the authority’s data protection officer and ask.

It is actually unnecessary. Builders (your neighbors) have to put up a construction sign with the address.

Depending on the federal state and the type of permit, one does not have to put up a construction sign. However, I believe then the neighbors do not receive any information either.