Floor plan design: Single-family house with 4 bedrooms and an office, 160 sqm

One idea that came from us was to swap the toilets and the entrance.

That means replanning again. That definitely affects quite a bit, including the upper floor.

Then the utility room could perhaps also be used as a cloakroom.

So the technical room would also be a utility room as well as a hallway and cloakroom?!

Get rid of the 75 cm doors on the ground floor. I didn’t even know that such things are still planned.

That is really a bit narrow.

Nope, completely sufficient if necessary. For a storage room that is only partly intended for bulky items, you can even plan about 60 cm. Many plan to enter the pantry through it, which I am not a fan of at all. But as long as you have only about one meter and not a room, 60 is enough, just like a kitchen cabinet. We also, out of necessity, have the WC door at RBM 78?. That is even enough for my stocky husband, he lacks nothing. For the living area, of course, doors as wide as possible should be installed,

That really makes me wonder: Is that still sensible or is it better to just leave it?

Can't you just plan the staircase along the wall on the side, with two quarter turns? Like in all space-saving houses? That's common in the Netherlands. Hardly anyone has anything else there. Then the room layout fits (albeit with some effort).

The same applies to you as can be read here https://www.hausbau-forum.de/threads/grundrissplanung-stadthaus-150qm-mit-satteldach-6-zimmer.47502/

Can't you just plan the staircase along the wall sideways, with two quarter turns? Like in all space-saving houses? That's what you see in the Netherlands. Hardly anyone has anything else there. Then the room program fits (albeit with difficulty).

What do you mean by that? The staircase is 2x quarter-turn = half-turn. It hardly gets more space-saving than as drawn. Where do you think you can save more? Example?

and with a crutch, laundry basket, baking sheet it gets tight. My parents have been cursing the only 75 cm door for almost 40 years

Where do you think one can still save? Example?

I cannot give an example, I cannot plan. I just had the thought that in the Netherlands most houses have the staircase along the side wall, then 3 rooms and a bathroom on the 1st floor, and a gable roof converted with 2 rooms and a bathroom in the attic.