Floor plan design of a bungalow with a basement on a gentle slope

Oh, both sides approximately equal?
....I am far from thinking about a split level, and hardly about an underground entrance. Even from the photo, the slope looks very moderate.

I think the insertion requirement might come into play here if the house only starts where the neighboring houses almost "end".

I never think of a garage in the basement either, but the OP has already planned it that way in his sketches

... so that one can somehow drive to the back with whatever on the property?

I don't really understand many thoughts here.
Either I am too "creative" in the use of a property for a house or rather limited when it comes to possibilities that I would tend to overlook if it is about the _further_, i.e., rather subordinate use.

I also never think of a garage in the basement, but the OP has already planned it that way in his sketches

... so that one can somehow drive to the back of the property with whatever?

I don't really understand many of the thoughts here.
Either I am too “creative” in the use of a property for a house or rather limited when it comes to possibilities that I would rather disregard if it is about the _further_, that is rather secondary use

Furthermore, I also see a problem with a width of 17 meters in placing the terrace to the west, because the setback regulations get in the way there.
So the terrace is either in the south or/and north.

Never do I think of a garage in the basement, but the OP has already planned it that way in his sketches

... so that somehow one can drive to the back of the property with whatever?

I don’t understand many thoughts here.
Either I am too “creative” in the use of a plot for a house or rather restricted, when it comes to possibilities that I would rather overlook if it is about the _further_, i.e. rather subordinate use

Have you looked at the other pictures?

Which variant without a garage in the basement would you suggest?

To park a trailer in my garden, that’s why the space is needed. Where else should it go?! You have to look at it as a whole.

I’m creative too and wouldn’t need doors etc. (everything open). The creativity ends here with the toilet visit

The whole street is full of houses with the garage in the basement. New builds as well as old buildings....

Furthermore, I also see a problem with 17 meters width to place the terrace on the west side, because the setback regulations get in the way.
Terrace therefore either in the south or/and north.

There are no problems there. This matter has already been agreed upon...

A few small things have given me food for thought. But somehow this does not help me further.

…But somehow this doesn't help me further.

You probably expect too much. Within 48 hours no one here will conjure up a draft. Especially because, as you can read, many questions are still open. Just when I saw the other two photos, I wondered whether the trees would be removed or if the 17 meters width is already the "net" width. Also, why even have a basement if you can just as well use the roof for storage or as a guest room. It's much nicer and cheaper to convert the roof. Your slope certainly doesn't really scream for basement construction.

Your sketch is not exactly suitable as a basis for improvements. I would start over, reorganize, and reconsider this "from the garage into the basement" concept. You should also really set priorities if it really comes down to deciding whether, for example, the trailer could be parked at the back or it would be better to have a garage or carport there (you can possibly drive through it) in favor of a south terrace. Otherwise, have a look on Google by googling floor plans. Or on Pinterest. Danwood also has very nice houses for inspiration

Why does the trailer have to be in the garden? Wouldn't it be easier to have a suitable space for cars, trailers, etc. right at the entrance of the property .. = privacy screen towards the street .. and really set the house further back?

With the height specifications, I still can't imagine how the driveway with garage into the basement is supposed to look and at the same time a level exit from the ground floor is supposed to pass.

Make some views of your plans. And anyway, is an architect going to be involved?

*pat*