Floor plan design single-family house solid wood construction 140 sqm in Lower Saxony

I think the door to the utility room is nonsense - at least as a second entrance door. I would find a patio door okay to go outside with wet laundry. Otherwise, such side entrance doors are usually expensive and still poorly secured. Much rather, I would swap the guest toilet and entrance door so that the paths with shopping bags are not too long. This also saves the winding footpath to the front door. By the way, I would position the house parallel to the upper boundary of the plan and under no circumstances plan the carport so crookedly next to it. Anything that doesn't have a 90° roof becomes unnecessarily expensive.

Huh? How about this:

If we sign the offer, there will still be a long appointment with a real architect for the fine-tuning. He works in the same office as the energy consultant and the structural engineer – we hope to gain some synergy effects from that. The architecture firm has been working with the manufacturer for a long time and knows the construction method well.

It probably means that the plan-authorized representative of the importer is a resident architect. His office community with colleagues from neighboring professions is no reason to hope that they would contribute on the side during coffee breaks without charge. Even if he has attended all system trainings diligently, that does not make the system itself any better, because:

Unfortunately, I don’t know much about log walls

... in my opinion, neither does the manufacturer know much more. Rather something like "something with wood, looking like how log houses used to look long before the Energy Savings Ordinance (but unfortunately with a roof like a dollhouse)." So actually more marketing than timber construction. However, this is not my main reason against this choice of manufacturer, see last post #99.

I recommend taking off the error-of-thinking hat and the pink marketing victim glasses, and behaving rationally as economy-minded builders wishing for partial own work and partial individual contracts:
1. choose a suitable kit house catalog model from Hebel or Ytong;
2. ask a general contractor, who obtains their materials from the respective manufacturer, for a price for this model in the standard "shell construction weather-tight"; placing non-load-bearing interior walls yourself;
3. have the finishing trades tendered by the architect;
4. commission a normal construction-supervising expert (finding such a specialist for an exotic construction method is a problem in itself).

The self-assessment of the builders does not fit the solution path one bit.

1. choose a suitable kit house catalog model from Hebel or Ytong;

I don't quite understand what you mean. The OP wants a log house. Why are you trying to persuade him to go with Ytong now?

Presumably because a log cabin house is quite demanding to plan and requires a professional as an organizer. And not the builder, who wants an individual log cabin house and cannot afford an architect. A standard house is already planned and built many times, so there are fewer pitfalls

For daily tasks like cleaning, mopping, laundry, etc., you go to the utility room about 10 times a day, so it's better to have it centrally located from the hallway.

Yes, definitely - thanks for this tip, at some point you really become blind to these things :D We will plan a door from the hallway into the utility room at that spot - whether this is in addition to or instead of the utility room/kitchen door we are currently discussing... I would only omit the side entrance door if, as suggested, we swap the house entrance and guest WC; however, I can't currently estimate if that would work dimension-wise. At least then you could leave out the second wall by the stairs, making the whole area much more open and less tunnel-like. I'll try to draw this this evening :)

However, my concern is the small utility room (HAR?) at the top right of the plan: it will probably be a bit too small for the technology and the craftsmen.

My husband has already measured all the technical equipment and played Tetris - he says it fits like that... We will take another close look when the technical plans are prepared to millimeter precision for the wall preparations - then you can always easily shift a wall a little if necessary. The room is really only intended for the technology, and we wanted the door there not to open into the room but to swing into the hallway - you ideally only need to go in there very rarely :)

By the way, I would position the house parallel to the top edge of the plan and definitely not plan the carport so skewed next to it. Anything without a 90° roof will become unnecessarily expensive.

The ridge direction is specified in the development plan - and unfortunately not just roughly but exactly on the west-east line, so that the entire south roof surface faces directly south. Unfortunately, we cannot align with either the property boundary or the street. The carport would be built independently and by ourselves anyway, and we had envisioned a green flat roof for it. Whether, how, and when that happens depends on how much we exceed our budget.

Presumably because a log house is quite demanding to plan and requires a professional as an organizer. And not the builder who wants an individual log house and cannot afford an architect. A standard design house is already planned and built many times, so there are fewer pitfalls

This is less about "being able to afford the architect" and more about the fact that we do not want a timber frame panel construction with white plaster and drywall walls. The alternative is a solid stone general contractor who does everything, we can and may do little ourselves (which is often advised against here) and who will then earn good money from us. We can neither contribute our craftsmanship skills nor my building material trade job and would end up not using our only jokers – that would be silly. Hiring an architect for a solid stone house exposes us to a price fluctuation risk that we cannot buffer. I cannot suddenly pay 500,000 euros instead of 400,000 euros just for the house, then I can’t build. We simply have no knowledge of masonry, plastering, installing windows, bricklaying, etc. The great advantage in our eyes of log houses is that we have a fixed assembly date, so coordinating the trades putting it together works more easily, we can do almost everything that still needs to be done ourselves including the technology and therefore don’t need anyone to plan it for us for months.

So, apart from the fact that we explicitly want this log house :)