Floor plan design of a brick house with approximately 145 sqm

I can say from painful personal experience - although "matched" with the situations of several friends - that the concept of "equal treatment" only "feels fair" in one sense: namely that the "big one" and the "little one" find it "stupid" about equally often. Not to mention that I always have to smile in builders' forums about how matter-of-factly the "calculation without the TroPi" is made when it comes to children's rooms

But as a man, you can contribute to ensuring that there is no TroPi child and that the woman does not have to take hormones for years.

But as a man, you can contribute to making sure there is no TroPi child and the woman doesn't have to take hormones for years.

Oh, do we have to "change" the "TroPi" now as well?
Despite the pill, despite condoms, despite the coil, despite (sometimes only seemingly effective) vasectomy: the result is in all cases: "nyah, hello, here I am!"

And also "quantitatively" there is "unexpected often comes" increasingly, i.e. the "second" child turns out to be multiples. That then also surprises the previously precisely balanced blueprint.

But anyway, why should you always build an emergency room? Why criticize when space is tight anyway?

Of course, that should not mean to fundamentally provide an "extra number" or "bonus" room. I meant my smirk more in the sense of "if you want to amuse the gods, make a plan," which builders often overlook. Residual uncertainties remain unavoidable, no matter how diligently you "precisely" shift interior walls.

I'll let you in on some of our ideas: The master bedroom on the upper floor will become children's room 1 and will be slightly adjusted in size to match children's room 2.

The old children's room 1 will become our office.

In the attic, the wall in the study will be adjusted with the one in the hallway, and the old study will become a walk-in closet. However, in this combination, the dormer would be unnecessary again.

Instead of a walk-in closet, a small bathroom would also be possible – but then with a dormer, since the closet(s) would have to be in the bedroom. On the other hand, I increasingly see the dormer becoming obsolete if we make a bedroom up there. Why would I need a dormer if there’s only a bed underneath?!

Or you could move the upper wall in the study inward for a built-in closet and still have space for a small bathroom – that would also be possible.

and the old study will become a walk-in closet. However, in this combination the dormer would be unnecessary again. [...] What do I need a dormer for if there is only the bed underneath it?!

A dormer provides standing height there, regardless of what (re)use the room undergoes at any time, thus contributing to its versatility. In the bedroom, it provides a facade window instead of a roof window, i.e. less greenhouse effect from the incoming light. I would therefore definitely keep the dormer(s) in the plan, although of course every avoided replacement slightly reduces the cost of the roof structure.

A dormer provides standing height there, regardless of which (re)use the room undergoes at any time, thus contributing to its versatility. In the bedroom, it provides a facade rather than a roof window, i.e. less greenhouse effect from the incoming light. I would definitely keep the dormer(s) in the plan, even though, of course, avoiding each replacement slightly reduces the cost of the roof structure.

A little is an understatement - the dormer costs an additional €7,000.

You can do it!