Single-family house with a ground-level granny flat on a slope

I’m trying to push it through anyway

Voting and convincing is better. ;)

Urgent in what sense? We would like to move next year in the fall to allow the little one one more year of kindergarten there before he sits in 1st grade as a complete stranger. This works out if we finish the planning by the end of July (that is the last municipal council meeting before the summer break). If it doesn’t work out, spring 2023 is targeted.

Update: we were at Das Massive in Heilbronn today. Our impression was quite solid. The managing director seems experienced and competent. However, he said that a 10% slope would be too steep and suggested limiting the driveway to a maximum of 8% and placing the garage under the house, building the three levels (garage, ground floor, top floor) staggered into the hillside.

He wasn’t very keen on the idea of building only two levels and positioning the garage on the side because then we would have to fill/support under the ground floor, which wouldn’t be correct. But I do want to at least partly fill the slope so that you can access the garden at ground level from the south side of the ground floor.

At 7% x 55 m = 3.9 m height gain
206 m is street level
3.9 m from the driveway
2.8 m room height and ceiling

So at 212.7 m above sea level, which I find a good height for the FB ground floor.

I have now made a sketch:

- Ground floor = granny flat & parking spaces; access on the east side

- Upper floor = main apartment; access on the north rear side (via a few steps at the parking spaces)

- Blue is the driveway

Can you tell me where and how much retaining wall I need to get as much level area as possible at the lowest cost?

Of course, I assume that I can use the excavation (of the rocky ground) for backfilling, otherwise the plan is obsolete.

Is the plan with the eternal driveway sensible at all?

The garages are smaller than your requirement for Level 2.

Why is the driveway so flat? 10% is not a problem.

The garage is smaller than the granny flat, granny flat + garage = same size as the attic. Do you mean the ground floor by level 2? Of course they are smaller. Especially because it’s only one garage and in front of it the turning area is meant to serve as 2 more parking spaces.

He suggested to us the driveway to the basement, behind and above that the ground floor, and behind and above that the attic. This means I would have to go 2 floors up from the garage, the parents just one floor after the long distance.

I don’t know why he thought 10% is too much. We would prefer less as well, no question.

OK, I found my mistake - I'm missing the 2.80 ceiling height when I don't have the garage under the house. So, a steeper driveway after all to at least reach the 212 or place the house further south and therefore give up the view and garden (which is big enough to let the children play there) in the south