DIY floor plan design for 2 people

That it echoes, that doesn't have to be (solution see , if I remember correctly: Lignotrend).

You just have to plan or have it planned.

As many have already written here, I can only warn from my own experience against going to the architect with ready-made plans. We also have a hillside plot and had previously considered several plan variants for how we could imagine our dream house, but nowhere near as detailed as the OP. We didn’t take any of these to the architect – I think fortunately. Our architect took two to three months for the design, and it was quite different from our thoughts, but so brilliant that we changed nothing except for minor details and now the building application is being worked on.

In my opinion, saving on the design for a hillside plot is one of the biggest mistakes you can make when building (I think saving on the architect in general is wrong).

A comment on saving on the architect: We are still very satisfied after 5 years with our own hillside house planning based on catalog templates and the floor plan of a residential floor in our old house. At the time, we consciously decided against an architect because I couldn’t really estimate the additional costs. And for the general contractors in the shortlist, I simply stated half our budget at the beginning. In the end, with upgrades, interior finishing, and landscaping, it was sufficient. :) Surely, an architect could have designed the house entrance in the basement level, which in our case would probably have been the ideal use of the terrain. (We tried, but at some point that became too difficult for me.) But then the basement would have had a room height of 245 cm instead of the current 235 cm, and just this change with all necessary follow-up changes would, with today’s knowledge, have pushed costs too high at some point.

However, we had a “garden architect” on board for planning the landscaping: Unfortunately, the plan for the street front was unusable, but we adopted some suggestions for the garden area. Overall, in our opinion, his quoted price was not appropriate for the service provided.

One more thing I want to say, I don't know if this was misunderstood or just misinterpreted, the 800k€ is the budget we have available without overstretching financially (equity and partial financing). That means ideas like continuous balconies, garden accesses from all rooms, etc. are not affordable for us either, our budget is limited.

This got a bit lost here in passing, but I think it’s quite relevant. I had interpreted the initial post a bit freely along the lines of "money is no object, we are rich and will build everything as we want." From the perspective that "money is limited," I think you should seriously reconsider and have a professional do the planning, who can possibly fit your wishes into fewer square meters. Your building, as it is, would be 19m long, that’s pretty huge. Adding outdoor facilities, pool, wellness, sauna & co on top of that with 800k (I assume you already own the plot?) could get tight then.

Hello Kati1337,

yes, budget is definitely an issue for us as well, maybe it was wrongly presented with the statement "financing is secured." To answer your question, yes, the entire field area belongs to us; we would only convert the shown partial area into building land - provided the municipality cooperates. I already mentioned that the pool, elevator, photovoltaics, and incidental construction costs are not included in our cost estimate, but we are aware that even without these, it will be tight. Our advantage is really that we live very rurally and the local construction companies still offer fair prices, for example regarding hourly rates, and for material prices we hope for a market stabilization and price decreases by the planned start of construction in 2024.

Actually, it’s primarily about the sauna session, relaxation room, pool bar and nice attendants we get when we go to the thermal bath

Then I don’t understand (even more) why you need a separate wellness area. In my opinion, that’s redundant and wasteful. You always have to heat the wellness area just because you go to the sauna there sometimes. You could simply build one big great wellness bath and put the sauna in there as well. Additionally, a small guest toilet. You can use the gained square meters for a second bedroom/office. Shift the entrance to the left according to the plan, place the bedroom on the right side of the plan facing northeast (nice and cool with maximum privacy), including a large (wellness) bath and dressing room. Access to the terrace remains. To the left of the entrance then the office/second bedroom, small guest toilet. But that’s just a thought, I also think you should go to an architect with just a room program and without plans.

until planned start of construction 2024

Two thousand seven and twenty-seven, but I already said that :)