Single-family house + granny flat on a slope with flexible use

First of all, many thanks to everyone else for your feedback. That is exactly why I absolutely wanted your assessment (even if I am not happy about the judgment and see our dream house disappearing).

So I hope I’m not making myself ridiculous with the question, but what exactly do you mean by the statement

am besten mit Maßen am Gebäude.

Significantly reduce the whole thing?

If yes, I have already asked: How much smaller can we get? I assume you can’t go under 160 sqm with 3 children’s rooms + office. How much savings does that actually bring? The conditions like difficult terrain, basement garage don’t change either. Besides, we don’t need such a house size at the beginning, when there are no or only small children, nor in old age, when it’s just the two of us again. Then we would also be fine with 130 sqm on the ground floor and upper floor. If necessary, in old age only on the ground floor, if stairs no longer work.

Are our thoughts so exclusive and absurd? Isn’t it actually sensible to only satisfy those needs in different phases of life that are really necessary?

A balcony is no replacement for a garden.
You pack a diaper, burp cloth, crawling blanket, rattle, drink for the toddler. You go to the garden loaded like a donkey. While doing so, you wish you were an octopus with Hulk’s strength. After 15 minutes you realize you forgot your water. Baby is crawling, toddler climbing. You have to leave your children alone now. No more quick trips to the kitchen with a view of the children.

Such a terrain just screams for living in the basement with direct garden access!
And that can be made so nicely. I think you really need to go to a proper architect. Houses on slopes are not without challenges...

Actually, I didn’t want to start a new fundamental discussion and especially not come across as resistant to advice. I have read all contributions on this and have talked many times with my girlfriend and also with other homebuilders. I also knew the opinion of many here on this topic. That is why I expected this and even considered writing in the initial post, please do not start a discussion on this.

But now I would still be interested to know if there are people in the forum who have built as we plan and now regret it?
Are there people here who have built like this and say they would do it again?
Do the proponents of living in the basement have hillside properties themselves and can speak from their own experience? Do they also consider the disadvantages that come with the living area in the basement?
I find your arguments partly really understandable, but the disadvantages outweigh in our consideration, so we have decided against this solution.
And even if we were to build on 2 floors, we would keep the living area connected to the street. And that is also what the majority in this building area do who have already started (and there are also architect-designed houses among them).

What are the disadvantages you mentioned regarding the living area in the basement? One disadvantage might be that you have to carry all the groceries down a full floor. I consider that negligible. We have to carry all groceries up half a floor, which was an absolute no-go for us at the start of planning. At some point, I had to accept that compromises have to be made with a sloping plot. After almost 1.5 years in the house now, it is so natural to me that I don’t even see it as a disadvantage. On the other hand, I can go straight from the kitchen to the terrace and into the garden.

We live on the slope in the basement.
My brother, just as you plan it, at parties, or even just like that, many run through the house to get to the garden, it would annoy me.

We have not regretted it so far, I was also "afraid" at first with the groceries, but you also have your peace towards the front/above.

Hi, as the owner of a (probably still a few years) undeveloped hillside property, I have already given this some thought. There are both advantages and disadvantages to living on the ground floor as well as in the basement. A newer idea was a "dining kitchen" in the basement with garden access and a smaller, pure living room on the ground floor with a view and evening sun. However, I haven't developed this idea further yet - so there is no sketch. You could later use this dining kitchen in the basement with 2 children's rooms as a separate apartment (dining kitchen, living room, bedroom, shower bathroom) and plan living, sleeping + 1 children's room + office on the upper floor.

I live in a hillside house and I have previously lived in a hillside house. I know what it's like to live without direct garden access, with and without children. Never ever No disadvantage of living in the basement with garden access could outweigh the advantages. Although I can't think of any disadvantage. My parents knew the disadvantages and therefore moved the living rooms to the upper floor so that they have direct garden access, friends of ours knew the disadvantages and moved the living rooms to the basement (situation like yours). By the way, we had an architect’s design who built a residential tower. He pushed the garage under the house because that is how it is done on a slope. Our plot is accessed from below. The opposite of yours. The slope remains the problem you cannot solve. Slope costs you can't change either. You have a large cellar under the carport (which should remain there) that could get daylight at the front. If you use the cellar as living space and do away with the granny flat, you could save the upper setback floor. And with that also the drainage planning mentioned by Matte. Your children's room planning is suboptimal. I already gave reasons. Because of later and separation. If the sleeping rooms are on the ground floor, you have to plan the entrance and the cloakroom differently. You don’t want the postman to see you lightly dressed hopping from the bedroom into the bathroom. Likewise, you don’t want visitors to instinctively open the bedroom door first because the living room is expected there. At friends of ours, you enter the house on the ground floor, there you have a guest toilet, cloakroom, the stairs down and a door to the corridor with the sleeping rooms. Normal room door replaced by an apartment door and a drywall partition inserted downstairs and there are two apartments.

So I hope I’m not making a fool of myself with the question, but what exactly do you mean by the statement

Your sketches don’t contain any dimensions. The graph paper behind them does indicate an approximate size, but theoretically it could also be a house measuring 20m x 17m.

You come across with your wishes like a hermit crab. The house constantly has to adapt to your life situation. Basically, I don’t think it’s wrong to cover a few eventualities. But you can also overdo it.

Do you really want to let someone live in your house? They would then constantly be running around in your garden. And that for a completely questionable effort/benefit ratio.

I understand that someone wishes for 3 kids. We also built 2 children’s rooms. But we couldn’t have any. Do you think now we’re going to sell the house or let someone live in it? Absurd.

How is the financing even planned? What happens when the first child comes? Will you handle everything alone then? Or do you have the money under your pillow?

Living room/kitchen without garden access is rubbish. I see it with my dad too. He built himself a second kitchen downstairs so he doesn’t have to carry everything to the first floor on the terrace (old building). His neighbor decided on a balcony instead (new building). They never sit on it. That says it all.