Optimization of floor plan for detached single-family house 155 sqm

I mean: I see walls depicted here and examples of furnishing or sanitary objects computationally just barely fitting "successfully tetris'd in"

I have a different view here. I had already furnished the apartment in various versions with a tool and was satisfied with the possibilities.

I would rather put it the other way around: omitting the controlled residential ventilation is compensated with a misleadingly low price deduction of 13k. Without controlled residential ventilation, there is no heat recovery, but rather heat loss shock ventilation - which in my opinion perverts the upgrade to EH40 instead of the Building Energy Act.

Honestly, we are also bothered by the absence of controlled residential ventilation. For cost reasons, we have already had to make cuts in several places. The house was once about 170 sqm and had to be planned smaller.
Based on your criticism, we are currently recalculating whether we can still scrape together the 13k € through savings elsewhere.

So he already works full-time now, and prospectively very soon both, without him and her disturbing each other. From three keywords (data protection, discretion, concentration), each one is in my opinion reason enough not to compete as two home workers for the resource guest room.

So I do not work from home because my employer lives 5 minutes away. Besides, I'm not really the type for it, it will only change in an extreme emergency. My wife will also not work full-time but only 20-25 hours. The financing of the house is also only through my income.

My impression is: the OP has — God knows how long — tinkered and now looks at his masterpiece with satisfaction.

On the contrary. I have given up the idea of drawing the perfect floor plan where everything is thought out down to the last detail and every piece of furniture already has its fixed place. There should be no gross blunders, and so far I don’t see any. However, I take your criticism to heart and will reconsider some points.

Regarding cost savings for controlled residential ventilation:
Yesterday we came up with 3 windows and one door to save costs. One window less each in the bedroom and bathroom to the north. Guest/office window to the north. And the utility room door can be replaced by a window. This is not enough money-wise yet, but would be a start.

I am probably redundant here:

Why are you taking this so personally? The OP is planning their house, not yours. In this respect, as a participant, you have to accept that tips or lengthy arguments do not have to be followed or complied with.
It is up to the forum respondents, including you, whether to repeat themselves over and over or persistently try to convince the OP of something. But - simply put - it is his house, his money, his decision.

So he already works full-time,

The OP clearly writes “without home office.” Quoted many times and yet not properly read by you.

We are currently on vacation at Lake Constance in a new building from 2022 without [Kontrollierte-Wohnraumlüftung]. So the wet windows are the least of the problems, but airing out at -4 degrees is sh**t, it should be at least 15 minutes in the morning. Of course, again in the evening, after cooking, etc. The children have to be dressed for it because otherwise they freeze, airing and then leaving is not an energy waste. Somehow it definitely works but it is no longer up to date.

And at home, thanks to [Kontrollierte-Wohnraumlüftung], you don't have to pay attention to that at all, it runs alongside. I found that it is one of the best investments in the house. Especially when I see how often people have problems with mold. Yes, I also had problems in my first apartment because regular airing was simply prevented by time constraints and shift work.

I don't know how much relevance it has, but our wall construction is diffusion-open. It is a timber panel construction with wood fiber as [WDVS] and cellulose in the cavity. At least the issue of moisture should be somewhat alleviated. Of course, it is still airtight and we have to ventilate.

I don't know how much relevance it has, but our wall structure is diffusion-open.

Since I unfortunately cannot answer with just one word, I have to put it into one sentence: no relevance

Oh, on New Year's Day I probably had too much sparkling wine in the orange juice and read the keyword Home Office with the wrong preposition ("im" instead of "ohne") by mistake. But the OP could have pointed that out to me when he treated my mathematical comma as a syntactic one. Well, at least we have opened the new year with proof of my fallibility. That's how it should be.

Maybe you should just speak plainly and not always be so arrogant, condescending, and beat around the bush. Your sentences are often endlessly long without added value.

I always gladly exceed the minimum length for posts; I do not want to and cannot contradict that perception. However, there must be misperceptions regarding arrogance and condescension. "In real life" I come across as nicer than purely in writing.

On the contrary. I have let go of the idea of drawing the perfect floor plan in which everything is thought through down to the last detail and every piece of furniture already has its fixed place. There should be no gross mistakes and so far I do not see any. But I take your criticism to heart and will reconsider some points.

Unfortunately, it remains incomprehensible to me how the shown design came about / what it is based on. I always advise laypersons doing DIY work on floor plan development as follows: 1. only start drawing after successfully distributing the room program across the floors, 2. first and foremost draw the current apartment and identify sore points as well as formulate improvement strategies, 3. begin the drawing planning on the upper floor, 4. develop the stairway starting from the (upper) exit, 5. do not borrow inspirations from larger models, and 6. if they want to add rooms to the template (classic: dressing room that is not separate there, or increasing the number of rooms in the group child / guest / office) choose correspondingly smaller templates.