What width for interior walls?

Hello everyone,
we are quite far along in planning our dream house. We wanted to build a single-family house with T9 bricks (36.5cm) in Tuscany style.

Now we are stuck on the width of the interior walls. I have read in many forums that it is perfectly sufficient if the load-bearing walls are 17.5-24cm and the other walls 11.5cm. That seems quite thin to me.

My builder considers these wall thicknesses completely OK. What do the experts here in the forum say about this?
I would feel more comfortable if the load-bearing walls were 24cm and everything else 17.5cm. What speaks against that? Is it just a waste of space?

Thanks in advance for the answers.

My developer considers these wall thicknesses completely fine. What do the experts here in the forum say about it?
I would feel more comfortable if the load-bearing walls were 24cm and everything else 17.5cm.

Why? Everything else does not carry weight but only separates.

What speaks against it? Is it just a waste of space?

Thanks in advance for the answers.

In addition, unnecessary costs are built in. (More costs for less living space)

Hello ypg,

Thank you for the answer. Do I understand correctly that it is quite normal for the non-load-bearing interior walls to be only 11.5cm-17.5cm wide?
I currently still live in an old house and the walls there are quite thick. That’s why the 11.5cm and 17.5cm seemed thin to me.

Regards

I do not measure the walls in all houses, but I always notice when a door has a door frame with a depth of 24cm doors also appear in load-bearing walls... 24cm is quite something. I look at floor plans very often for professional reasons... they very often contain (with few exceptions or load-bearing walls) 11.5 dimensions. I think you are making unnecessary worries about that

Thank you ypg, now I am relieved again