Floor plan of our double garage - ideas, feedback?

Hello,

I have attached two possible drafts for our planned double garage.

The green area shows the idea for the location and shape of the garage. The house is already built.
At the top of the picture is north, so the garage would be located to the north.

To the west, the ground slopes down a bit, meaning that a retaining wall of about 2 meters would be needed there at the boundary, with the garage on top. In general, little can be done with the western part of the plot, as it is just the neighbor’s ugly yard.

Variante 1: Directly on the boundary, which would result in a trapezoid.
Variante 2: Build in a corner to follow the property line but have right angles. We would give up about 1.3 sqm of our plot or leave it unused. This might make the construction slightly cheaper.
Variante 3: Only build the upper parking space as a garage, the lower one as a carport and passage. However, I don’t see why we would need a passage there. It is steep there anyway. It is rather unlikely.

Another problem: To the east there is a tree that is actually quite nice and really should not be there because of the “visibility protection area.” Approximately below the note “7.95.” We would have to cut it down to use the driveway properly. Maybe you have some ideas about that?

What do you think? Do you have any further ideas? Personally, I find Variante 2 a bit nicer because it is more symmetrical (more right-angled).

If you are already out of KO anyway, I recommend the garage builder Bimsfertigbau Hoffmann in NR (Heimbach). They build garages (complete) on site, made to measure, and also slanting following boundaries from pumice boards.

Yes, I have heard of it before. But as far as I know, they require a foundation/slab. And that would then have to be made either trapezoidal or offset, as in the pictures.

In the west it goes down a bit

Can you still manage to keep the average wall height under 3.20m (§8 (9) a) state building code)? If yes, I recommend option 1. The triangles from option 2 either develop into unused dirty corners or, in a tense neighborly relationship, into triggers for disputes.

There is a tree to the east

I am grateful for every healthy city tree that does not have to be cut down, but not at any price. If the northern part of the garage will mainly provide shelter for things not intended for it, leave it standing; otherwise, plant a new one in the garden.

Can you still manage to keep the average wall height under 3.20m (§8 (9) a) State Building Code)?

What exactly does that mean? The entire wall can be 6.40m high?

So the retaining wall must probably be about 150cm high. Then the garage of probably 250cm height would be on top of that. Overall, the neighbor would be looking at a 4m high wall.

Variant 1 is easier to use because a continuous wall is available as a shelf support. By the way, I wouldn’t leave any land to the neighbor for use, because that’s what it would come down to, right? How else are you supposed to do greenery maintenance back there, you can’t even get to it yourself anymore.