Phew, that is quite a transformation… I confess: I am not just not a fan, but an enemy of access paths between cars. It’s not just about the mail and parcel carriers who have to squeeze between vehicles, but also the residents themselves when they don’t use a car.
An accessory apartment without a terrace… how old is the mother-in-law? Does she pay for the basement, in return she gets a dark hole in the basement without a terrace, but has to accept quite a long walk around the house? Almost no daylight comes through the window of the accessory apartment due to its location. And what does come in doesn’t reach the middle of the room. An accessory apartment in the “basement” is better placed on the south side. The idea with the access on the west basically takes away your entire west garden. You barely have a meter left to walk around the house there. You should think about how you want to walk through, use, maintain, and make accessible your outdoor areas. I don’t see any practicality for everyday life.
I also find the location of the technical room quite illogical: why accept the long cable run when you could use the front corner of the house for the technical room? Spontaneously, I would put both the technical room and the accessory apartment at the front. Do you know what the planner was thinking that one has to cover an eternally long path around the house for the accessory apartment?