New construction after triplet birth. Looking forward to your ideas.

Are we even talking about a stone house? because it can be wonderfully expanded, unlike a wooden house.

So, if I spend €800k on a new build (including the plot), I believe I can get that money back when selling (let's say after 20 years, if it's too big without kids then).

I disagree. Your house will be even harder to sell than an architect-designed house without a children's room. How many families in Germany have 4 or more children? Surely not all of them live concentrated in your region, so that your house would be snatched out of your hands. In absolute numbers regarding the budget, I am in favor of the extension. But you are setting the wrong priority. A conservatory is not intended to increase useful living space. Rather, it’s about an extension to the living room (where two more children's rooms can fit + an extension to the kitchen to make it bigger). Upstairs, the case is usually already lost. It’s just a pity about the Baukindergeld with the new build. But we’re currently discussing that issue in another thread.

With the eaves height, we are limited to 4.5 m, which unfortunately removes the "cubus" option for us. Therefore, we would choose a shed roof.

More likely a broken / offset gable roof, or would the ridge height allow a real (i.e. single-slope) shed roof?

How many families are there in Germany with 4 or more children? Surely they don't all live concentrated in your region, so your house won't be snatched away from you.

But there are definitely some people who want a big house; bedrooms can also be repurposed, combined, etc.

But there are already quite a few people who want a big house; children's rooms can also be repurposed, combined, etc.

Yes, I agree with you. But if you already have a guest room and/or study in addition to the 4 children's rooms, you won't need another 3 studies. Unless you are a family of 4 teachers.

5 bedrooms are special. As a family of 4, you only need 3 bedrooms. And let's be honest, everyone (exaggerating) except me has a study/guest room downstairs -> So bedroom number 6

But if you already have a guest room and/or an office in addition to the 4 children's rooms, you won't need another 3 offices.

The above-average number of children's rooms will not only have load-bearing walls; the next owner can tear some down. Whether a childless couple later divides the 250 sqm more extensively or makes a doll collection room, a smoking room, a room for BDSM play, or whatever out of it, doesn't matter. I just wanted to say: buyers for 250 sqm of living space can also be found among people with few or no children. That doesn't make a house harder to sell – an 80s conservatory is more likely to do that.

Voluntarily subjecting yourself to a new building? Never. Would definitely choose the extension. Financially also by far the better way.

Is that meant seriously?