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

I thought the roof terraces were too large for you. about 130 m2 that costs a lot.

But then you come to FFH 211 m. The slope of the driveway will then be difficult to keep below 15%.
a box is 1 m.

You have a huge retaining wall and then the house on one level. Right?

Can you upload sections, floor plans, and site plans? If you don't have a snipping tool, photos are also fine.

What does the [Bebauungspaln] say about enclosures?

So the development plan says that this is alright (apart from the fact that the intermediate level should have been greened). Only enclosures adjacent to public traffic areas are regulated.

Regarding retaining walls:

“Retaining walls
Retaining walls are permissible. If the retaining wall is higher than 1.50 m, it must be divided in height and the upper half must be set back by at least 0.50 m; the step thus created must be greened. Retaining walls must be made of natural stone/muschelkalk, either in gabions or as block stone inserts.”

What irritates me much more is the passage that I apparently need an exemption if I raise or cut the terrain by more than 1.5 m.

“Fillings and excavations
Fillings and excavations
(§ 74 paragraph 3 no. 1 State Building Code)
Fillings and excavations of more than 1.5 m of the natural terrain slope are not allowed. Care must be taken not to significantly alter the natural terrain slope. The terrain conditions of neighboring properties must be taken into account.
Exceptionally, fillings and excavations of more than 1.5 m can be approved after examination of the building application.”

The existing floor plans serve as a basis for now, but may become obsolete as soon as the architect makes better proposals. The LRA said I have to green the projected garage/terrace and paint it anthracite to create a stronger separation from the house. Then we would get an exemption for the prescribed wall height of 7.5 m. I still haven’t exactly understood the issue with the reference height (intersection point of existing terrain) but the LRA said he has less of a problem with it as long as we ensure the house does not appear too big.

I actually don’t want to have more than 10% for the driveway. I would even prefer 8%. You have to consider that parents-in-law, children, and guests will walk along this long driveway.

I’ll send a few photos of the property itself. Slowly I am really starting to wonder if this was such a wise idea.

PS: On Sunday we are visiting [Lechner Massivhaus] in Fellbach, who build houses from clay. There are already some experiences with them here, so I am curious to see what comes out of it. [Zapf] garages are supposedly a subsidiary of theirs and they also build the basement themselves. Feel free to share any experiences about that.

I cannot contribute anything on the retaining wall issue. But what stands out: one or two pantries that hardly add any value, and no real wardrobe, just a niche. I would drastically reduce the pantry and use the rest to create an [AB] that can be used as a wardrobe. Overall, I don’t find much appealing in the design: entrance area far too large, staircase as a strange focus back there in the dark, narrow kitchen, no dining area, rather a dining nook that blocks access to the terrace (there really isn’t space to rearrange furniture), senior apartment with hardly any space for a wardrobe, and the multipurpose room somehow isn’t nice either.

Super thanks.

My draft takes all requirements into account even though I didn't know them. Building with the slope is the keyword.

You can forget about an 8% incline. That doesn't work with the slope. Unless you build the garage further down and then install an elevator.

How high is the retaining wall in the north? There is more than 1.5 m of terrain being balanced there.

You will probably get the exemptions. The one in the north got them too. The LRA has to earn a living as well. I paid 700 euros for the exemption back then.