Brainstorming ideas for a house on a steep slope

Hello everyone,

I hope the text won’t be too long, I need to elaborate a bit.
I am looking for ideas on how to build a house on a steep slope, with access from below and garden access from above. I’m just at the very beginning, so please forgive me if it still sounds quite theoretical. It’s first about whether it is even realistically feasible, whether the property is interesting for me at all.
The property mostly belongs to my parents, so I would basically get it for free, which is also the reason why I’m considering taking on such a difficult piece of land.
I am attaching a site plan. Unfortunately, it’s a little bit older, which is why I roughly scribbled with pencil on it. The property in question is the pentagonal 91/5, about 500 sqm. The entire area 92/3, including the area around the terrace drawn in afterwards, which points toward 91/5, belongs to my parents but is several meters lower, so it really is two separate properties.
The pencil-marked rectangle around 19/15 belongs to the city. I would still have to buy that. A few years ago there was an inquiry, the city would release it, and I would have to pay about €30,000 for it.

My problem now is that the entire area where both plots meet, and where I would have to put the house to keep the garden, is quite a steep slope. From the street you can see on the plan to the current plot boundary, there is a height difference of 4.80 m over a distance of 10 m.
The house would have to be built where the two areas meet, with the front door and garage below and then a terrace with access to the garden above. So you would have to gain quite a lot of elevation. Or else set the house back a bit and then build further up the slope. The more you have to dig out and shore up the slope, the more expensive it becomes, of course.
You can certainly give up part of the garden.
If I put the house entirely on plot 91/5, which is flat, I have no access because you can hardly drive a car up a slope.
My rough initial idea is to build a garage down below and then the actual house on top of the garage, but set a little further into the slope again. I don’t yet really have a clear picture of it in my mind.
I hope I was able to explain it understandably; I myself can’t quite imagine it yet.

I wanted to get some inspiration and came across a thread here in the forum where someone also wants to build a house on a steep slope:

On page 8 he has 2 comparison pictures showing roughly how it is supposed to look. However, he calculates with quite high costs, which are not an option for me. The house can surely be built a bit more simply. The question is whether I gain that much height this way.

I could imagine something like this, too.

I hope I’m not overwhelming you with such a long text. It would really be great if some experienced builders could just share their opinion. Maybe someone knows a comparable house or so. I’m grateful for any advice.
And please feel free to ask if something is unclear.

Best regards,
Tobi

Garden is work and next door the parents have a garden and are also not getting younger and will eventually need support. Therefore, I wouldn’t necessarily mourn the "lost" garden.

Otherwise, I personally find hillside locations great because you usually have an unobstructed view and often also the possibility to build in such a way that the living area is hardly visible from the street.

I find that appealing, but only with a good architect who can make good use of the possibilities of the plot (these are possibilities, not restrictions!).

Financing: depends on how much equity you have. With only 30,000 invested in the plot, you are well off overall, and how much the hillside location costs more I cannot judge (surely also depends on the soil condition), you should maybe talk to a developer who may have already built a house nearby with the same issue.
Hillside location means also: you don’t have to dig out a whole basement but just dig a bit into the slope.
The example you attached (House Tirol) is really VERY steep; but when you drive through the mountains (you’re from Bavaria too, that happens there occasionally) you see many houses on hillsides with very different solutions. I don’t think all of them were tycoons who could afford such a house.

And again garden: if you really are a garden freak: terrace gardens are extremely appealing!

Where is south and where is north?

The post you linked to is about a HUF house. HUF house is not exactly the cheapest provider.

I wouldn't put the garage downstairs and the living spaces on top of it. It's annoying to carry every purchase, simply everything, always over steps. Eventually, age or a broken leg will come.

Advantage of a hillside location, you can access the garden from every floor. Shade, sun depending on that.

Costs, there are several points, and I would really talk to a builder as suggested.

How about having living spaces downstairs instead of a traditional basement? Depending on the orientation, these can be sunny living/dining rooms/kitchens, or nice cool north-facing bedrooms.

I would avoid property developers, it is your land after all, and only contact a general contractor who has already built several hillside properties. Was it Luxhaus, Weberhaus? Some prefabricated house manufacturer... However, I would recommend consulting an architect regarding hillside and terraced houses so that something reasonable is built on the property that fits the slope.
Best regards in brief

Weberhaus advertises for hillside houses.

Google "Schöner Wohnen, hillside houses."
There are some quite nice houses there.

Thanks already for the answers. I photographed the site plan so that north is exactly at the top. The slope therefore runs more or less from southwest to northeast. @haydee: I also don’t really like the idea of having to climb so many stairs, but I have to gain quite a bit of height so that you can enter the garden level at the top. That’s why the idea is to basically put the house on top of the garage. On the Weberhaus homepage there are some hillside houses, but in none of them does the terrain look as steep as this. There is usually only one step in the underground. And they all look quite like luxury villas.