Basically, the dead-end streets are needed to access the rear properties.
Parcel 38, for example, is accessed from the main street.
This already takes up quite a bit of space:
The floor area ratio/floor space index is also missing in the initial post... I don’t know if that was mentioned before.
I would rather imagine a wide building, for example:
The upper floor mirrored accordingly would need to be revised
Then from the left:
5 m building boundary - 15 m house - 6 m garage ... 4 m width remain
and from the top of the plan
3 m + 1 m for the access path, 7.8 m house, 9 m property depth remain at the bottom of the plan
Question: would a pedestrian path from the main street as access to the front door be possible?
The house depth here is still 7.8 m, overall you could certainly save something with the space program indicated by the OP to arrive at a similar floor area as with the currently planned house.
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You placed the utility/technical room towards the main street. Is access from there? Wouldn’t it also be possible in the other north corner of the house?