Floor plan single-family house on sloping plot with terrace / roof terrace

I would divide the floors differently. Children upstairs and living towards the garden. The children don’t really use the garden anyway after a while. Staircase in the middle of the house. Reduce the size of the hallways. Widen the garage.

Do you also have elevations? The windows at the bottom of the plan in the basement (technical room + bathroom) - are those light wells?

I would ignore your changes for now and just take a look at the architect's draft. Basically, you probably decided a long time ago that the children should have access to the garden and that you have enough greenery to deal with on the terrace. I hope for you that it stays that way – often (actually always) it's exactly the other way around.

Before I go into any possible bottlenecks in detail, which you have already recognized yourself, I would just like to throw out the suggestion to move the staircase lengthwise along the bottom wall to the place of the kitchen unit / guest WC. That should solve several problems. I hope your imagination is sufficient to see how the rooms would then change and I would leave the implementation to the architect.

A question about "planleft rooms will not work even in shell dimensions" - which rooms are meant?

0.9 width RBM unfortunately results in just under 80/85 cm including plaster and tiles. For a guest WC in a 109 sqm terraced house sufficient, but not comfortable. That's what our wet cell in the caravan has...

Storage room next to toilet (so the kitchen moves closer to the terrace)

The storage room doesn't have more advantages than two tall kitchen cabinets. Instead, I would plan 2 storage rooms per floor where mops and the like can also be stored. A sauna would be more suitable in the basement... Moving the stairs with the house, lengthwise to lengthwise... that offers more possibilities with better room layout. But then everything will be different, and that's also good. Therefore, don't get stuck on what you see now. The planning of a common room causes the least problems, there are many appealing options for that. Regarding the children's floor: all well and good. But a child remains a child even at 15 years old, whom you probably want and should sometimes keep closer to you at night (illness, grief...). The worst case is rather if a 5-year-old feels abandoned when they have to go downstairs, while the parents seek the greatest possible distance, than if a teenager wants something for themselves and you have lost control anyway (warning: pun!).

The development plan remains completely incomprehensible in the graphical representation (and is also cut too narrowly), the strangely red building envelopes look like those for stepped-story buildings. Designing the building here as for a typical hillside plot fails insofar as the plot has this atypical slope: first a steep wall, then a bend, and then a significantly gentler slope further on. Such building gaps are no coincidence ;-)

I would divide the floors differently. Children upstairs and living facing the garden.
The children won’t really use the garden anyway at some point.
Staircase in the middle of the house
Reduce hallway sizes
Widen the garage

Unfortunately, I haven’t really explained it. From above, you have a beautiful wide view that we want to use – both from the ground floor at street level and especially from our bedroom/roof terrace. I absolutely take on board the staircase/hallway issue, we definitely need to work on that again. The garage is fine for us as it is – one car fits in, but we will only park the bikes there and charge the car in front. Thanks for the feedback!

Do you also have elevations?
The windows at the bottom of the basement (technical room + bathroom) – are those light wells?

I would ignore your changes for now and just look at the architect’s draft.
Basically, you probably decided a long time ago that the children should have garden access and that you want enough greenery on the terrace. I hope that stays the case for you – often (actually always) it’s the other way around.

Before I go into any potential bottlenecks at length, which you have already identified yourself, I just want to throw out the idea of moving the staircase lengthwise along the bottom wall to the spot of the kitchen units/guest WC. That should solve several problems. I hope your imagination is enough to recognize how the rooms would then change, and I would leave the execution to the architect.

Unfortunately, I don’t have elevations yet – but since we are going around another round anyway, those are coming. The windows downstairs are not shafts, but planned at the upper edge – the terrain on the street side is about 70 cm below ground floor level and can slope further down at the windows there.

Regarding garden access: we do want that too – from the terrace you can go down into the garden via 3-4 steps and from there a grass ramp leads down the left side of the house into the garden. We want to use the wide view from up there over the other houses – down below feels too confined for us.

Thanks for the staircase feedback – that’s exactly what I’m taking to the architect.

0.9 m wide RBM unfortunately results in barely 80/85 cm including plaster and tiles. For a guest WC in a 109 sqm townhouse that’s sufficient but not comfortable. Our wet room in the caravan was like this...

The storage room has no more advantages than two tall kitchen cabinets. Instead, I would plan two storage rooms per floor where mops and so on can be stored as well.
The sauna would rather be suitable in the basement...
Moving the stairs lengthwise in the house, along the length... that offers more possibilities with better room layout. But then everything changes, and that’s good too. So don’t get stuck on what you see now. The fewest problems arise in the planning of an all-purpose room, as there are many appealing options.
Regarding the children’s floor: all well and good. But a child remains a child even at 15, whom you probably want and should have closer to you at times, e.g. at night (illness, worries...) The worst case is when a 5-year-old feels abandoned because they have to go downstairs while the parents seek the greatest possible distance, rather than a teenager wanting some independence and you have already lost all control (warning: pun!)

Thanks – we’re taking that to heart. Even though we will probably keep the parents upstairs / children downstairs division, we will make sure the distances are really shorter so it clearly feels like a single unit. Several friends of ours have done this and it works well.

The zoning plan remains completely unclear in the drawing (and is strangely too tightly cropped), the strangely red building envelopes look like those for stepped-story houses. Designing the building here like a typical sloped lot fails insofar as the plot has this atypical slope: first a steep wall, then a bend, and further along a clearly gentler slope. Such building gaps are no coincidence ;-)

I understand what you mean – but I do think it works. The zoning plan says, just as you suspect, stepped house – the basement protrudes forward and is a balcony for the ground floor. We don’t want most of the basement projection because we prefer more garden space and a 2 m wide balcony is not exactly practical (that’s why rather a terrace on the south side/left). Our goal is to have the ground floor fairly level with the street and to go down to the garden via a "natural" ramp on the left so that the slope is slightly modelled.

Thanks again to everyone for the feedback – it helps a lot to go around another round. I will get back to you once we have more clarity.

I unfortunately haven't really explained that. From above, you have a beautiful panoramic view, which we would like to use—both from the ground floor at street level, and especially from our bedroom/roof terrace.

A beautiful view may be nice and is enjoyed by everyone who has it. But you don't use it the way you think. It's like a beautiful picture. You have it, then you glance at it briefly; if you don't have it, it doesn't matter either. I am always amazed at how people planning to build think that their "beautiful view" will change their lives and that they will get up 10 minutes earlier or go to bed 10 minutes earlier just to enjoy the "beautiful view." You have it. Nothing more and nothing less. From experience, the roof terrace is also not used, or very rarely used, if you have a garden to take care of.