Cancellation of the installation appointment at Allkauf Haus - costs or compensation?

ok understood. The scaffolding is standing on the neighbor's terrace. It also seems to be necessary due to [Arbeitsschutz].

Have you meanwhile obtained a permit?

I am still waiting for the details from the site manager about how the scaffolding must be set up. Only then can I negotiate with the neighbor. If I, and therefore he, do not know exactly what will be installed, the conversation will be difficult… I hope to have everything I need next week.

It was not visible on any checklist and no one asked for my approval. That is exactly the point. The construction manager called me about a week before the planned house assembly and said that such an approval would be good because it can be difficult to fully set up the scaffolding. However, she did not say that it could lead to everything being canceled without approval. In any case, you need a bit of time for such a task and that should be listed in a protocol beforehand. Nothing about this is mentioned during the acceptance of the concrete slab or in the protocol. Other things, like compacting the crane area, etc., are mentioned, but nothing about approval from the neighbors.

The company neither asked me nor the neighbors if they could use the neighbor’s property.

Nowhere does it say that such approval must be presented before the house assembly.

That’s exactly why I don’t understand the whole matter.

hmm…
maybe one should also look at the matter from the contractor’s side, who of course does not wake the neighbors from their bed at 5:55 a.m. five minutes before as if they were a child causing noise during quiet hours.
There is no checklist, but a whole page of text about what the builder needs to take care of.

He has that in hand. If something is not understood, apparently Allkauf Haus is expected to be asked by the builder. After all, Markus is not the only builder. And if every builder was explained building from A to Z, some might get bored. Then they simply refer to the builder’s duty to inquire on questions, and regarding approvals to the builder’s duty to deliver.
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… And, of course, in written form for filing.

Shortly before setting (e.g., the day before), the documents are checked: if something is missing, the crew is called back.

Who is to blame? According to the contract (the uploaded page about the obligations of the builder is part of the contract) the builder.

The marked text states that permits for utility connections and traffic areas must be obtained. A property of one or the other neighbor is not a traffic area.

https://de.m.wikipedia.org/wiki/Verkehrsfl%C3%A4che

Ever talked to the neighbor before?

Who is to blame? According to the contract (the attached page about the obligations of the builder is part of the contract) the builder.

Although neighbors are not mentioned, one can certainly subsume many things under "permits" and thus transfer the "blame"/responsibility to the builder. The thread starter is not the only builder, but like most others probably a first-time builder. I also cannot understand why the requirement for such permits is not on a checklist for the builder. Especially since the construction manager did not call it a "must" but rather a "can" a week earlier, at least that is how I see it. I still think there are other reasons why the house erection was postponed or that the postponement could also have been avoided by the house erector.

I still wouldn’t argue with the house supplier about it, but write it off as a learning experience. For example, we ordered a multi-utility cabinet (specifically for our house, of course) through the house building company or their base slab installer. It was also brought to the construction site on time by the base slab installer, but a necessary adapter was missing, which we --> had not checked. Result: The gas company arrives but cannot connect the gas due to the lack of the appropriate adapter. So it had to be postponed, resulting in us not being able to do the screed drying with the "normal" heating but instead using expensive construction site electricity. Should we have checked the adapters for completeness and researched if they were the right ones? I don’t know, it was a whole box of adapters, and one box among maybe 50 boxes and packets. Should we have asked the in-house gas fitter to check the box, is that even his job since the gas supplier needed the adapter and not the in-house gas fitter? How would that have been received? I’ll know next time I build a house. :) Still, building a house brings joy and I would gladly do it again anytime. :)