Is financing feasible or are we overextending ourselves?

This has already been mentioned several times here. But I did not ignore it; rather, we simply hadn't thought enough about the second child yet and will now (have to) do so.

The plan is 2 or 3 in the end

Our daughter is only 8 months old and therefore the second little one was still "far away." It should be understandable that you can’t answer such a question within 12 hours.

with a 2nd child, the available time for personal effort is drastically(!) reduced.

On page 2 you said: I don’t know what thoughts you want to have now, but you should already know how many children you want. I don’t believe that with 3 children you can (or want to) work more than 50% on the side. If things go badly, that’s several years with loss of income. What does your partner say about how far apart the children should be? A second child before building the house comes faster than you think, but with a 2nd child the available time for own work is drastically(!) reduced.

Yep, we want to do 2 or 3, but we haven't really thought much about when yet. We'll take a closer look at that in the next few days. You usually have time in the evenings on the weekend.

So, my dad was also at the appointment with the construction company. The consensus in the end was that he would give me a complete offer without [Saitär, Haustechnik, Fliesenleger] (because his guy retired). He wants to break down all the trades, and as soon as the offer is ready, we'll all sit down together and cross out what we want to do ourselves in [EL].

After that, we already inquired about [Sanitär] and [Fliesenleger] ourselves.

I don't really find that confusing.

Are 140 sqm enough for 5 people?