Floor plan design / draft single-family house flat roof with double garage

["Edit"] *Misclick* :-(

A straight staircase causes more hallway space and limitations in the floor plan.

Not everyone here agrees that children's rooms must be larger than 15 sqm; the living area must allow it. Only having more hallway area than children's room area is a disproportion.

Look at your drawn upper floor
The left: children's room with 11 sqm is okay
Parents' bedroom not usable. You have to get into the bed over the foot end.
Right: parents have more space for sleeping than children for sleeping, doing homework, playing, meeting friends.
No storage space in the upper floor at all

2 children's rooms, 1 bedroom, 1 study, 1 bathroom
That is quite a lot for the floor size. You don't have to restrict yourself with the staircase.

Yep, I can understand the objections, we just find the straight staircase nicer and more pleasant to walk on, also considering that we will get older someday; if it really can't be helped, we'll have to give it up, even though we currently don't exactly know how to improve with a winding staircase and still keep the L-shape downstairs and the recess in the basement, which we would like to have.

Friends of ours built similarly but with a short steeper straight staircase, metal/wood staircase with overlapping steps; maybe you could gain something there as well.
Do you think 90 cm width for the staircase and 110 cm hallway upstairs is sufficient? You only move in once, so of course it will be tighter then...

We’ve drawn another variant to scale where we moved the staircase up by 40 cm, made it 10 cm narrower (90), and let the upper floor extend 75 cm over the garage; please don’t take the bathroom interior layout too seriously.

With the room sizes (children’s room 13 sqm, bathroom 15 sqm, bedroom 19, study 9.5 sqm) I think one can live with that more easily?

Friends of ours built something similar but with a short, steeper straight staircase, a metal/wood staircase with overlapping steps, maybe you could gain something there as well. Do you think 90cm width for the staircase and 110cm hallway upstairs is sufficient? You actually only move in once, of course it gets tighter then..

These are not options, sorry. First you talk about comfortable walking, then you come with steepness and a relatively narrow staircase. This staircase will probably have to have a laundry basket moved up and down daily. You have to be able to "afford" a straight staircase. It doesn’t cost more but it needs more hallway space. And you don’t have the budget to plan the rooms around the hallway accordingly. Then the house becomes bigger and more expensive.

I wouldn’t take this design now to continue planning. The rest isn’t that great. Your design from #26: Are you planning with 3 boxes = 1 meter? I find it hard to grasp. Could it be that the staircase is too short? I’m not a fan of oversized children’s rooms, but in your case all rooms are bigger (except the study), even the bathroom. I think a children’s room may well be bigger than a bedroom if they are supposed to stay in the house for 18-20 more years. Basically, it always irritates me when the cars get a luxury residence, and the argument for small children’s rooms then is that you yourself lived in smaller spaces before...

In the dining/living area we thought that a room height of 7m and a glass front would bring enough light.

Well, in summer the sun sets in the NW. And it is also something nice to have a few rays of it inside the house.

These are not options, sorry. First, you talk about comfortable walking, then now you come with steepness and a relatively narrow staircase. Apparently, a laundry basket has to be moved up and down this staircase daily. You have to be able to "afford" a straight staircase. It doesn't cost more, but it needs more hallway space. And you don't have the budget to plan the rooms around the hallway accordingly. Then the house would become bigger and more expensive.

I wouldn't take this design to continue planning now. The rest is not that great.
Your design from #26: are you planning with 3 squares = 1 meter? I find it hard to grasp. Could it be that the staircase is too short?
I'm not a fan of oversized children's rooms, but in your case, all rooms are bigger (except the study), even the bathroom. I think a children's room can be bigger than a bedroom if they are going to stay in the house for another 18-20 years.
Basically, it always irritates me when cars get a luxury dwelling, and the argument for small children's rooms is that one used to live smaller themselves...

Well, in summer the sun sets in the NW.
And it is also something nice to have a few rays of it inside the house.

1m is 3 squares, the staircase is smaller at the top because the lower part is minimally overbuilt by the hallway above.

I have read somewhere that 90cm is the standard width, that's why I'm asking what experiences others have and what staircase widths they have.. can you not comfortably carry a laundry basket over 90cm wide stairs?

We probably just know weird people if in our circle of friends only 11-13 sqm children's rooms are built; due to a double bed + walkability and more wardrobes for 2 adults, a bedroom unfortunately can't be only 10 sqm, in the bathroom up to 4 people might be there simultaneously in extreme cases, why plan only 11 sqm and give the child 4 sqm more just so that the children's room isn't the smallest room? A child growing up in a single-family house with their own 13 sqm room (for a desk, wardrobe, and bed) with a large garden to play in will not have a bad childhood, especially since for many years much of everything happens anyway in the living-dining area: playing, homework, eating, chatting... at least that's how we remember it from our childhood. When the kids are out, you have 2 huge rooms free...
Even if we left out the "luxury dwelling" for our cars, we still wouldn't plan the children's rooms any bigger.

But that is a fundamental question on which everyone can have a different opinion...

Steep stairs just don’t work well for walking. We find ours quite awkward to get used to. A landing staircase is just as easy to walk on. 90 cm is very narrow. Swap the children's room and the bedroom. Then the bedroom won’t have a wall next to the children's room.

The staircase is 110 cm wide for us without a handrail. With a handrail on one side, it’s okay; with handrails on both sides, it’s borderline. Handrails on both sides may be necessary „in old age“. Even my father manages going up and down the stairs with handrails on both sides despite hemiparesis.

Our hallway has a rough construction dimension of 125 cm, excluding the railing. I find it very comfortable like this; 10 cm less would still work.