Floor plans of a single-family house with a granny flat, please tips and feedback

I actually meant a photo from the street onto the property, so that you can see the neighbor's gable. You want to build onto that one, right? Who dictates that you have to make the roof and house fronts identical?

Your parents are also quite close to the street.

Have the buildings already been demolished?

7: Entrance of the existing old building which is to be demolished and parceled into 2 plots

A semi-detached house will certainly be built there. Which will heavily shade the SE for you. Therefore, 2 meters towards the street are already helpful.

Take an architect who has experience with building gaps. Without legal foundations, I would have positioned the house completely differently and oriented the garden not towards the street, but towards the parents. To make it appear larger, it might also be usable without a fence.

Finally, finally some suggestions :) I gladly accept the last 3 posts! I had already given up hope that anything constructive would come out of this!

If you only appreciate as "constructive" suggestions the pictures of other courtyards that also only get light at midday in winter, but at the same time deliberately ignore the repeatedly expressed constructive suggestion "to go to an architect," then please continue giving up, the tragicomedy is unbearable to watch – I'm out then. The request "less picture, more info" came up repeatedly, and then you casually come across with the claim that the house is identical in profile to the neighbor’s, after you spent all along riding the "everything is allowed" lane of the popular misunderstanding "§34 = carte blanche" :-(

Proposal to purchase 10 and 11 and build 4 terraced houses on them. Sell 2 for a profit and you can realize the two in the southwest yourself according to your wishes. Or negotiate with the neighbor so that you realize it together. You both gain the setback area.

These plans all already exist, but they didn't really impress us. (Here, however, with 2 gables)