Ground floor layout ideas for a semi-detached house

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My idea improves several things.
1. Hall closed = No cool air flowing into the living area.
2. Separate heating circuit in the hall that does not have to be used = lower heating costs
3. Slanted wall in the hall = creates enough space between the open door and the stair descent + direct view into the room when entering.
4. Extended wall in the living room. Creates a cozy living room corner and space for TV etc..
5. With straight walls, the kitchen seems sufficiently wide to me. Possibly the refrigerator could still be placed next to the oven cabinet. But that would come at the expense of ergonomics and possibly energy consumption (heat from the oven vs refrigerator???). If anyone has any constructive suggestions for improvement here, please share.

2. Separate heating circuit in the hallway that does not have to be used = lower heating costs

Point 2 will not occur. What the heating circuit in the hallway does not heat up will be compensated by the other heating circuits with more throughput. The heating will even become less efficient. The fact that temperatures (energy) in different rooms equalize can be read from the old physicists ;) under the "principles of thermodynamics"

A classic case of a butcher’s estimate, I would say :)

And here are the alternatives I would prefer before making a tight house even tighter. Because the hallway will hardly achieve anything, a door neither, the heating circuit will probably heat the hallway together with the guest toilet, and anyone who enters the house will first want to come home, instead of lingering more than necessary in a narrow hallway … so they will first spread into the room. One will have to live with that and also be able to with such a towel rack.
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The simplistic calculation rather results from the fact that the lower heating costs must first compensate for the costs of the wall and door.