Floor plan 160 sqm single-family house - improvement ideas?

Your budget is a bit tight. Something has to go. With a child, there is less time for hobbies. The idea that children only sleep at the beginning is a myth. Really consider whether you should treat yourself to an above-ground room. Especially daylight is nice at a workbench.

What would, in your opinion, be a necessary minimal budget for 160 sqm with [Keller]? On what assumptions are your budgetings based?

Hmm, I can't quite understand that now. That 400k € is too little is quickly judged, but telling me a rough estimate of what is needed is then not possible?!

A basement is almost mandatory since I have hobbies that require a lot of space. Brewing equipment, fishing gear, woodworking shop, and maybe soon even a game chamber... I would have to build much bigger to manage without a basement. [From one preference discussion of open space vs. no open space straight to the basement vs. no basement discussion. I hope we can now get back to the actual topic?]

I have a quote for a log house with 160 sqm for around €270,000 (including electrical work, heating). Here, €130,000 would remain for additional construction costs and basement if I assume a budget of €400,000.

Hobbies are of course a reason, but for my woodworking shop I treated myself to daylight for a nice atmosphere. Regarding the mentioned €270k for a 160 sqm house – what level of completion is that? Or how does the provider call it? Sounds like a lot of self-performed work.

Regarding the calculation: for a reasonably nice single-family home (turnkey) I would estimate €2,500–3,000 per square meter of living space in Bavaria.

Ready to move in with some own work also works under 2,500. however, you have to sample with a sewn-up wallet. Even if you manage the magical 2,000 Costs for 160 sqm already 320,000 + basement + garage + incidental construction costs Don’t ask what the outdoor facilities cost. Even with pure own work you won’t get far with 10 K. Your plot is not exactly mini What do we base this on? We are all further along than you with building. We know how quickly another 1,000 euros disappear. We have been active here for a longer time and read among other things such threads Somewhere there was another one Why was an additional financing necessary? Or something like that Then also such ones Here everyone gave up because wish/dream cannot be realized with the budget. For us, the house caused about 2/3 of the costs from the ground slab floor slab, garage, outdoor facilities are real chunks, then there are many small things Road closure, construction electricity, relocating the light pole, etc.

you see, air spaces or galleries are not appreciated here.

I was only concerned about the dogma gallery = bad or only feasible from 250 sqm.

That is not true. I have also criticized air space, but I have one myself.
First plan the necessary rooms, then the nice-to-haves!
And yes, it is very echoey. I already knew that from my parents' house, but we have no children living with us, so we adults automatically consider each other.
In a family of four, you are certainly more likely to have contrasts in the daily rhythm.

I would gladly continue to work on this new design in the forum as soon as I receive it.

We look forward to hearing from you. Hardly anyone here has been left hanging if there is something to discuss.

Maybe as a replacement there is a small annex that is open upward to the roof and thus brings the desired feeling of air space. I just really like it when rooms are open upward to the roof slope.

You can open the rooms under the roof upward. The extra cost is not too high.

Brewing system, fishing equipment, woodworking shop and maybe soon a game chamber...

You are planning 2 children's rooms and building on a plot over 1000 sqm.
I can well imagine that you will not come to one or more hobbies anymore. Quite a few hours a week already go into the garden and such. The children anyway. Just as a thought.

In your place, I would plan a nice wooden annex or garden shed. Also start saving money for it now.
All cellar offers apply to a bare, unfinished cellar without stairs and without tiles.

I have an offer for a log house with 160 sqm for around €270,000 (including electricity, heating). Here, €130,000 would remain for incidental construction costs and cellar if I assume a budget of €400,000.

Which level of completion?
Also sanitary fixtures? Toilet and shower?
You would still have to plan 20–40 for equipment, e.g., controlled residential ventilation, sockets, and also floor coverings.
Yes, and then the cellar (finishing).