Floor plan: New construction on existing bungalow basement, 1.5-story

Thank you for the numerous feedback. I'm reconsidering some points again...

I would leave out the wall between the stairs and the built-in shelf.

The built-in shelf (at about 1m height) is supposed to make the otherwise unused airspace above the basement stairs usable. We will still need some thermal insulation between the shelf and the basement stairs, as the basement lies outside the thermal envelope.

What a beautiful bedroom it could be if you gave up a separate dressing room.

Yes, the semi-separate dressing room more or less "accidentally" came from the idea that the attic should have enough space for it. The practical benefit that the partner is less disturbed when getting dressed in the morning also makes sense to me. However, it is not an absolute must. Perhaps you would like to briefly explain how you would design the bedroom without a dressing room (bed position, wardrobe)?

Because of the full basement, I consider the attic at most redundant. At best, I would reduce it to a crawl space accessed by a pull-down staircase, and otherwise keep the attic open (with "treehouses" above the children’s rooms).

We want to take a middle way here: K3 and bathroom open to the ridge, the remaining area as an attic, also for possible later use as an office, hobby room, etc. The pull-down staircase in our current rented apartment annoys us (despite rarely used because the basement is also available) enough that we want to stick to a fixed staircase first. Here too, we want to make the space under the stairs as accessible and usable as possible from the bedroom or bathroom/shower.

I would shield the door to the dining area with a wall.
I would take a double door between hallway and open area. Where would the wardrobe be? By the stairs going up?

Yes, the visibility of the ground floor WC still bothers us. Instead of an additional wall, we had so far discussed delimiting the whole thing with sensibly placed furniture. Maybe a wall would be more consistent after all.
The wardrobe is under the ground floor stairs and on the wall to the open area. Space could get tight for a double door then.

Here once again with the changed bathroom.
How is heating done? Surely not with oil.
Is the huge dormer approvable?

Thanks for the suggestion. K1-3 makes a lot more sense this way.
You swapped the WC with the bathtub to keep it out of the sightline from the door, right?
Without the stairs, the bathroom and dressing room naturally gain significantly more space. I am reconsidering how important this staircase really is to me now.

Heating is done with a heat pump.
According to our (local) architect, we will get approval for the dormer like this. We'll see.

The built-in shelf (at about 1m height) is intended to make use of the otherwise unused air space above the basement stairs. We will still need some thermal insulation between the shelf and the basement stairs, as the basement lies outside the thermal envelope. [...], the remaining area as an attic, also for possible later use as an office, hobby room, etc. The pull-out stairs in the current rental apartment annoy us (despite rare use due to the also existing basement) to the extent that we want to stick with the fixed stairs for now. Here too, we want to open up and make usable the space under the stairs from the bedroom or bathroom/shower as much as possible.

You don't have that severe a lack of space. Don't make the house feel cramped as if you were on a boat or in a camper van by trying to use every single liter of the room volume.

Both child 2 and 3 are narrow rooms with sloping ceilings.

Why do the children need a balcony? You cannot place a desk on the east side to enjoy the view. If there is a balcony, why don't the parents have their bedroom with the view? The children probably won't live in the house as long as the parents.

How do you want to wash laundry for 5 people in that bathroom? Clothes, bed linen as far as the eye can see in that room. A laundry room would be important to me.

The stairs under the roof are also a waste of space; instead, we open an attic ladder or whatever it's called, super comfortable.

Both child 2 and 3 are narrow rooms with a sloping roof.

Why do the children need a balcony? You cannot place a desk on the east side to enjoy the view. If there is a balcony, why don’t the parents have their bedroom with the view? The children probably will not live in the house as long as the parents.

It is actually being considered that we swap the bedroom and child 3. Then the children's rooms would all face south and be roughly the same size. The parents’ bedroom would then be in the northeast as you suggested, and we would probably use built-in wardrobes to utilize the roof slopes in the low 40cm knee wall. The balcony (which is directly after the chimney on the potential candidates for removal list) would then get a balcony divider towards child 2.

How do you want to wash laundry for 5 people in that bathroom? Clothes, bedding as far as the eye can see in that room. A laundry room would be important to me.

We still have the option for a laundry room in the basement, but for convenience reasons we would prefer to have the washing machine upstairs. The clothing chaos then has to be managed by measures such as a laundry system/wardrobe (50cm space on the east wall). Laundry will then be hung on the balcony or in the attic.

The stairway to the roof is also a waste of space; we would open an attic ladder or whatever it's called instead, super comfortable.

I can understand the reservations. Removing it would also give us the possibility to actually realize a separate laundry room on the upper floor... Nevertheless, this "feature" is a beloved whim from the earliest planning days. It allows us to access the attic, for which ideas are already bubbling in all sorts of directions (play area, jam studio, Lego showroom, etc. pp.). With the stairs, where possible, we want to make use of the dead space in the north (under-sink cabinet), west (shower niche), or south (shelf).

The planning is progressing and there are new plans that I want to briefly show here. After submitting the building application 2 months ago, documents had to be subsequently provided (including a waste disposal concept due to demolition), which delayed the approval somewhat. We now expect the building permit probably by early February.

In the meantime, our architect has started with the construction drawings.

Construction method:

[*]Ground floor: aerated concrete 42.5cm, interior walls: aerated concrete or sand-lime brick
[*]Attic: dormer and interior walls: timber frame
[*]Ceiling ground floor/attic: 20cm concrete ceiling, with suspended ceiling for installations
[*]Ceiling attic/roof peak: collar beam ceiling

Here are now some changes that were suggested to us, among others, in this forum (Thanks for that! :) ):

[*]Omission of wardrobe in bedroom
[*]Bedroom on the east side
[*]Omission of fireplace (may possibly be retrofitted externally on the west side sometime in the future)

What still does not quite fit:

[*]Insulation of cellar stairs must be on the inside
[*]Interior walls on the upper floor to be moved 10-20cm upward on the plan (more space for the bedroom)
[*]Windows on the ground floor have no lintel but, due to the placement of the roller shutters, are nevertheless not full-height in the room
[*]Meaningful room layout for shower/toilet on the ground floor
[*]We still have to consider a separation between the dining area and shower/toilet (line of sight), possibly with furniture
[*]A sensible placement of an installation shaft (central controlled residential ventilation, electricity, heating) is still a mystery to us. In the existing cellar, we are theoretically flexible with the choice of the technical room. The current technical room (top left on the plan) at least does not seem very shaft-compatible.

Are there any further hints/criticism/tips?

I notice the parapet height of 1.00, which is probably meant to be 1 m. However, it seems to be measured from the raw floor. For the floor structure, you have at least 16 cm planned, unclear if covering is already planned. But this means that the finished parapet height for the kitchen is only a maximum of 84 cm. You should definitely check this with the kitchen planning.