Construction costs are currently skyrocketing

Kitchen belongs to cost group 600

And therefore not to the ancillary construction costs. You said it yourself :)

Again something on the topic. Half a cubic meter of concrete for placing rebates currently costs 58 € at the building materials dealer around the corner (Bayern). 25 kilometers further another building materials dealer 106 €. There is currently a lot of rip-off in the market!

There is currently a lot of rip-off on the market!

Not necessary: the former may have secured his purchasing conditions at the cement plant for a longer period and is then allowed to significantly raise them in the next purchasing negotiation.

Today received 2 offers again, regarding the exterior plaster:

Frame in white around all windows and doors on gray facade: €50 net per window/door

Base plaster 30cm height as natural stone version instead of cement coating (I would have to check again but I think that would be standard) €1040 net

No, it is furnishing. Additional construction costs are expenses needed for the house construction and incurred during the construction. Additional construction costs are definitely financed, furniture only if the bank chooses to do so.

Does the order of the land charge by the notary actually count as additional construction costs?

If I pay these costs myself in advance and also the surveyor, then this will not be financed, but my equity will also decrease as a result.

Notary, real estate agent, property tax etc. belong to the ancillary purchase costs.