So I would basically have the terrace facing southwest.
And where is the house entrance?
Does the 5m mean that nothing can be built within this circle?
No, the circle is, as mentioned, just a symbol. When replanting, IMHO you only have to pay attention to the minimum distances to the property boundaries (
§16, Neighbor Rights Act - NRG) and to cables. Later, when the tree is large, construction in the crown drip zone can be difficult.
Could I place the garage like this and plant the tree behind the garage?
Could work. Is the cable easement already secured by a burden and/or land register entry? Then you would know to what extent your property is affected.
What would be your suggestion?
Since I don’t value a south garden, I would place the garage on the southwest boundary and the house next to it on the southeast building boundary. Of course, this is no solution for sun worshippers. For a south-facing orientation, you have chosen the least favorable of all the still free plots. Is the northwest neighboring plot already taken?