Floor plan single-family house approx. 140m² - separable staircase

It is not the first draft. It is also not primarily designed with the idea that we want to move completely to the ground floor, but we want to have the option.

Basically, the floor plan of the house is fixed. The L: living room/dining room kitchen are fixed because we want this location.
After that, we have to "recede" a bit because at least 12.5m are needed in the south for parking space, garage, and passage.

I posted the topic here to use the opinion of many eyes.
I realized this with the fireplace topic as well and will/have to come up with something for this.

Topic staircase:
This can easily be separated by extending the stairwell (masonry) and connecting it downwards to the kitchen corner.

The biggest topic here in the forum seems to be the bedroom downstairs: (Not at all for us anymore)
The minimum size for a bedroom with a double bed is currently 11-12m², exactly the size we have.
When viewing such a room, we found it good. For us, it’s not too small as a bedroom either.
At the moment it is planned as an additional room/office, which we definitely wanted anyway.
If someone sketches a better solution with the same living area downstairs, gladly.

Topic basement:
The main reason: We want the largest possible garden and at least 2 additional rooms with 15+m² for workshop, hobby, storage.
Additionally, a utility room and a basement, and the technology should also be accommodated somewhere. (Buffer storage).
Theoretically, you could enlarge the ground floor and attic by 20m² each to have the same area, but 1. that would be more expensive, and 2. less garden space.

:
The kitchen connections/pipes go into the south children’s room. The 2 children’s rooms will be connected by a breakthrough and with a balcony to the west the living room/kitchen.
The staircase opens in this direction because both now and in the future there should be a small wardrobe on the left.

:
That is probably a matter of opinion. I don’t like the "modern" single-family houses. We have looked at over 100 houses, and we just prefer it more in this direction.

:
I probably have to address the fireplace topic, but we want it as a "room divider."
Adding an extra toilet upstairs is also an idea. I definitely want a separate toilet.
By the way, I have lived 25 years without a toilet in the bathroom and 10 years with. I definitely don’t need it.

:
Everyone basically wants approval first.
A pantry next to the kitchen would be an idea, but it’s not possible. We have thought about it more than enough.
"Modern single-family houses" often solve this with a 1-2m² pantry. That is not an option for us.
PS: The things we often need (e.g. pasta) will be in the apothecary cabinet.
The pantry is more for things you buy in stock or rarely need.

:
The fireplace is connected to the heating circuit; otherwise, it would overheat the room completely.

Which compromises do you mean? It’s about weighing priorities and budget.
For us, the basement, garden area, location of living/dining room + kitchen, and a separable staircase have priority.
That’s why this draft came out. Surely the living room could also be reduced from 4 to 3.5 and meanwhile make 15m² bedroom downstairs.
But precisely that would bother us for the next 30+ years.

:
I don’t understand the limitation. For me, no room has a limitation except that the pantry is not directly next to the kitchen.

After the division, there is an apartment on the ground floor with a pantry, but a bedroom that is too small, instead with direct access to the cellar; on the upper floor, a 2-room apartment is created with a 9 sqm dressing room as a captive space and a separate toilet next to a huge bathroom. I only hope that the tenants downstairs are allowed to use the utility room and the garden as well. At least the pantry in the middle of the house has disappeared.... I can remember that the design from back then was also defended.

:
There are no tenants, I think you misunderstood something.
One option could be that we move downstairs (ground floor and basement) and one child / both children can occupy the upper floor.

I don't understand your points of criticism.
I find the bedroom with dressing room very successful and would have planned it exactly like that freely as well.
The bathroom also has the ideal size and the toilet could be integrated just as well. But we do not want that.
Enough has been said about the bedroom. I can only recommend everyone to look at a room with exactly these dimensions.
The pantry, if one theoretically moves to the ground floor, is no longer a pantry but a storage room / storage space.

Regarding the pantry in the middle, I did admit that it is not very successful.
But there was no other option except to completely relocate it.
Which is now again being brought up as a point of criticism.

A water-guided fireplace would certainly not overheat a room of this size. However, an airtight fireplace without a water jacket would. Our children are almost out of the house. I can't imagine them moving in with Mom and Dad, especially not voluntarily and with partners. Why would they? Children eventually live their own lives! Your opinion is set anyway, so I can only wish you much success with the house construction.

looked at exactly these dimensions (3.4 * 3.4m) in a model home estate and came to the conclusion that you can definitely sleep like that.

Looking is not living!
Bed 220, wardrobe including baseboards 70cm, leaving 50cm as passage.
Last year I had 50cm next to the bed because moving boxes were blocking the way. Result: I broke my little toe. This year a foot surgery paralyzed/lame me... I don't need to explain the details, but 50 cm definitely would not have been enough for me to quickly get to the bathroom. It doesn't get easier with age...

Separable living units

There are no tenants, I think you misunderstood something.

No, I think you missed explaining yourself!

Ultimately, everyone should build as they want. There are even builders who definitely want a basement but store all their rarely used stuff in valuable square meters on the ground floor, e.g. in the pantry.

A walk-in closet upstairs is, in my opinion, functional, as is the bedroom. But overall, the house is later no longer functional for separate apartments. If it is a MUST to separate upstairs from downstairs later, then you have to plan accordingly. Otherwise, you’ll be annoyed later because one part is oversized and another was viewed disadvantageously.
What do you do with your guest WC on the ground floor when you later only live downstairs? Do you banish your wife from the bathroom so you have your "separate unit"? Or do you then knock on the door of your adult child's apartment to use the separate toilet?

If you don't understand my point of view, you have the other users who also gave a lot of advice.

Regards, Yvonne

Ok, thanks for your assessment.

What do you think is oversized? Where could I save?

The pantry will hold items that are used too rarely for the kitchen and too often for the cellar.
I don't consider a separate unit necessary later for 2 people, only for 4-5 people does it seem reasonable to me.