Floor plan with restrictions for townhouse (mid-row house) for family.

I don't find the proposal from bad at all, to consider separating living and eating/kitchen areas. Somewhat unconventional, but the plot is as well ;-) . So on the ground floor kitchen and eating, on the upper floor 2x child and guest (the room can be used by the children if no guest is present). In the attic then living and parents' sleeping.

What I also noticed is, is a daylight bathroom a "must have" for you? In many floor plans of narrow terraced houses, it is rather located in the middle of the house to grant the windows to the rooms.

I have recreated it, that is my suggestion, and came across two surprises (positive and negative).
The basis here is the same as with the OP... a shaft at bathroom height for water and electrical lines would be good, but I forgot that.

The ground floor with stylish open-plan kitchen
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Then the upper floor with loggia for the children, family bathroom, and office (children with me in the south - north would also be somewhat dark because of the courtyard)

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Attic: the negative point is noticeable that with a pitch of 40 degrees a roof terrace must be pulled in quite a bit in order to get enough wall height for the window areas. Thus, the roof terrace from V1 probably falls out if it doesn’t have enough depth.
Second negative point just came to me: are the terraces even allowed? Dormers were mentioned...



The positive point: you can generate a lot of light and airiness upstairs if you leave the attic open. I have now created a ceiling height of 5 meters. Bedroom and bathroom, of course, belong closed upstairs ;)


You could also insert another level there as a highlight:

Wow... thanks for the elaborate drawings! I also like them a lot. We had similar designs/thoughts already. But at the moment, we think the bright large room is almost too good to be used mainly for sleeping. No idea... probably we should really hire the architect now. By the way, in the [DG] I additionally assume a knee wall of about 60cm: 6.2m (wall height) - 2.5m ([EG]) - 0.25m (ceiling [EG]) - 2.6m (1st floor) - 0.25m (ceiling 1st floor) = 0.6m (knee wall)

I have now worked with 50 KS, since you build somewhat higher despite having a basement.

But at the moment we think that the bright large room is almost too nice to be used mainly for sleeping. No idea...

Why only sleep? That is a large family living room :oops:
Otherwise, the 33 sqm (minus the sleeping area, roof slopes not considered) are too small for everything. For example, your dining table is not walkable all around due to the slope. At least not upright ;)

The gas supply line is about 5m away. So gas would be good. Or why should I reconsider the heating technology? Gas isn’t bad, is it?!

Bad certainly not, but unfortunately not future-oriented either. Gas prices will rise and you will regret it. I would go for geothermal energy or an air heat pump. If there are still possibilities, a correspondingly large photovoltaic system on the roof. It might even be that the photovoltaic system will soon become mandatory for new buildings anyway. Then I would entirely do without gas.

Certainly not bad, but unfortunately not future-oriented. Gas prices will rise and you will be annoyed.
I would go for geothermal or an air heat pump. If there are still options, a correspondingly large photovoltaic system on the roof.
It might even be that the photovoltaic system will soon become mandatory for new buildings. Then I would completely dispense with gas.

Where is he supposed to lay out his trench collectors on the property?
Deep drilling will probably also be difficult; as far as I can see, no heavy equipment will be allowed on the tiny yard.
Setting up an outdoor unit for an air-to-water heat pump will also be interesting. Either you can't maintain the distances to the neighbors, or it takes up the little space left on the terrace and then annoys with noise development.
The house is predestined for gas. Just because everyone here constantly preaches the mantra of electric heating, you can still make economically and technically sensible decisions beyond ideology. Gas will be available for several generations yet; the price will stabilize again in the long term.
There is also very little facade area that does not border a heated neighboring house, so the heating demand should be quite manageable anyway.