Bungalow heavily shaded, still build?

Provide the address of the property. The situation can then be initially assessed quite well via the Geoportal NRW.

Thank you wpic for the link. I have created a screenshot which I will upload shortly...



About my plan:
On the outside you see a scale with measurements. Briefly explained:
Coarse grid = 2m
Fine grid = 50 cm

I see no problems that cannot be solved by a clever design. This is the usual starting point in a tight urban planning situation. If necessary, your preliminary design will have to be revised more or less extensively to ensure sufficient lighting/sunshine inside/outside.

However, it first needs to be checked whether this BV is even permissible in terms of building and planning law ([Bebauungsplan], building lines, building boundaries, floor area ratio/plot ratio, setback areas, parking spaces, access roads, ownership conditions/[Bebauung in 2. Reihe]) etc. There will be some critical points, for example the boundary development with residential use or the undershooting of the 3.00m setback according to [SO]. Both will initially not be possible or must be clarified after studying the documents, through some preliminary talks with the building authorities, or within the framework of a building inquiry.

Basically, the bungalow or a comparable development would be an interesting option.

I also see this as feasible, maybe with a small east-facing terrace as a breakfast terrace :).

A competent planner needs to handle that!