Construction of a 144 sqm bungalow in Fichtenwalde (near Potsdam)

I understand according to the construction performance description that the eaves box is made of wood.

I also gather that. It's like with us, it was made from wood. Ours is also 50 cm. It's very good, you can walk around the house with dry feet. ;)

Even if the roof box is made of wood and impregnated, you still have to maintain it regularly.

Just like the facade. Before that, there is nothing to do, as it is not directly exposed to the weather. Cleaning insects, etc. is more appropriate, but material choice hardly plays a role, and with a bungalow it is not a problem anyway.

One more question. Behind our property there is a wall leading to the neighboring property. There is a door installed there, so that the neighbor can theoretically enter my property. Can I politely ask him to remove the door? Are there any regulations/laws regarding this? I also wanted to talk to him anyway (the woman is known to me, she also worked in the clinic), because they disposed of their plastic pipes on our property.

The door is not there by chance,
either it is a shortcut for him or your empty lot has already been used as a landfill by his grandpa, father, himself, or child.
Address him directly about the pipes,
he should remove the gate or you should close it with wire (construction site security) ;).
Otherwise nice, but firm,
you will need a saw, sickle, dog, etc.

The door is not there by chance,
either it is a shortcut for him or your empty lot has already been used as a dump by his grandfather, father, himself, or child.
Speak to him directly about the pipes,
he should remove the gate or you can close it with wire (construction site security) ;).
Otherwise, be nice but firm,
you might need a saw, sickle, dog, etc.

Well, it might have been a shortcut 30 years ago. Is there a law/regulation I can refer to in case of doubt that he is not allowed to have a passage door to my property?

If no rights of way for the neighbor are registered on your land register excerpt, he is not allowed to do anything and must close the gate