Single-family house 180 sqm, basement, 2 full floors + gable roof

Footprint of 8x10m; living area of 177 sqm

We revised the floor plan with the architect again yesterday. As soon as we have a new (close to final) design, I will gladly post it for discussion.
No knee wall is planned, but the attic will be planned with a large dormer and balcony.

80 sqm footprint and 177 sqm living area without knee wall, only with dormer – I’d say close to final: it has to be bigger inside than outside *scratches head*

As mentioned, as soon as we are finished, I will gladly upload something here. The discussion just doesn't help right now. We don't care whether it is 170, 171, or 180 sqm. It varies. With 8x10m, you are limited to the ground floor and upper floor anyway, and whether we have 5 sqm more or less in the attic is not important to us, since that will only be the parents' area.

Soundproofing and sliding door not planned. In what way is a sliding door related to drywall?

The sliding door fittings are done by the drywall installer. Depending on whether the door should disappear visibly/invisibly, that is also his job. But it’s irrelevant since it’s not planned.

The kitchen is to be considered separately and is also not done by an architect - I fear about 20-25k

Still, it belongs to the total sum. Depending on the requirements for the electrical installation, it definitely makes sense to involve the architect and electrician. You should definitely budget 25k.

With 45k for plumbing work, my hope is that the architect included two showers, two toilets, three washbasins, and a bathtub... Otherwise, I wonder what costs that much.

Well, roughly 10k each is sanitary pipe installation and underfloor heating. That’s why the question about building services was whether ventilation is included in the rest. If not, then the rest could be for the bathrooms. But my tip: go to a wholesaler beforehand and have the bathrooms planned. The sum will surprise you (like with kitchen studios).

Tiles only at most in the bathrooms.

Calculate the square meters. Under 5k won’t even cover the material. And the labor is very expensive.

The discussion doesn't help right now. We don't care whether it's 170, 171, or 180 sqm. It fluctuates. With 8x10m you're limited to the ground floor and upper floor anyway, and whether we have 5 sqm more or less in the attic is not important to us, since that's going to be just the parents' area.

You can look at it that way. Or you can consider whether a 10 sqm difference in the calculation means about €25,000 difference. Just as important for estimating costs is whether the carpenter/roofer installs a standard gable roof without anything on it or if large dormers, skylights, etc. have to be taken into account. That easily buries 10-20k right away.

So, regarding the shell construction including the basement, the architect once inquired with a corresponding craftsman who confirmed the calculation - possibly even a bit cheaper, but we probably won't start until next spring. So let's see how it looks then.

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Calculate the sqm numbers. Under 5k, not even the materials will cost that much. And the labor is very expensive.

Thanks for your advice - we created an Excel sheet once and here assigned all rooms regarding flooring and roughly wrote down sqm prices and craftsmen costs. We come to a max of 18sqm of floor tiles. We have to see about the walls, but let's continue as before.