Floor plan of a new country house in a large garden according to §34 (with demolition)

Hmm, probably south at the bottom of the plan.

What I stumble over

[*]Access to the terrace, either blocked by the stools at the kitchen counter or the dining table is in front of it
[*]Guest room top left of the plan, I would place the entrance door so far up that the lower wall of the plan could also be well furnished with cabinets. In the hallway, the cabinet on the left has found a place elsewhere
[*]Bathroom upstairs: entering and immediately running into the shower wall, bottleneck between shower wall and washbasin
[*]Bedroom rough construction depth 276 cm, so roughly 270 cm. I always calculate a bed with a headboard, etc. at 220 cm. For me, 50 cm at the foot end is somewhat little space. And I don’t understand why there are two floor-to-ceiling windows there.
[*]Children’s room bottom left, entrance door as far as possible towards the bottom of the plan, so that cabinets fit on the wall next to the stairs.

: Sometimes it is the reference to simple things that makes the forum so helpful. Here it is your note about the closet-friendly door positioning that helps the builders for years without causing additional costs.

Bedroom shell construction depth 276 cm, so roughly 270 cm. I always calculate a bed with headboard etc. at 220 cm. To me, 50 cm at the foot end is a bit little space. And I don’t understand why there are 2x floor-to-ceiling windows there.

We have 60 cm between the foot end and the wall and that is tight. For walking through it is OK, but handling a vacuum cleaner is annoying.
The floor-to-ceiling windows offer the illusion of waking up more outdoors. Surely it can be omitted if every last cent counts, but I find it a very nice personal touch to the house.

Overnight guests are actually a very important issue for us, but in our opinion they can also be well combined with the home office requirements and the 2 possible children's rooms (1 is definitely necessary).

Could you please always label the rooms? I now see 2 children's rooms, 1 bedroom, bathroom, dressing room, and another mysterious room on the upper floor. What is the latter?

We continue working directly with the floor plan and not with a vague description of our circumstances because we already have a very precise idea of how large parts of the floor plan should be designed.

I find this "we know exactly what we want" statement together with this amateur draft rather presumptuous. For example, the living/dining area is tiny. Unfortunately, the many guests who are supposed to sleep at your place can never sit with you at one table. The bathroom is a narrow corridor that already annoys you when you enter. The bedroom is also too narrow. On the other hand, the staircase has taken up too much space.

The developers and general contractors who see and have already seen this draft will not advise you but will build this crap exactly as is. They do not care at all if you have to squeeze past the bed for your entire life. Why should they? If the customer orders it like this, you avoid any discussion and don’t need to hire a professional with elaborate drafts.

We have 60cm between the foot end and the wall and that is tight. For walking through it is OK,

After moving in, we had boxes next to the bed for a few weeks, so we only had these 50cm. The result was a painful fracture of the little toe.

I find this "We know exactly what we want" statement together with this amateur draft quite presumptuous. For example, the living/dining area is tiny. Unfortunately, the many guests who are supposed to sleep with you can never sit with you at one table. The bathroom is a narrow tube that is already annoying when you enter. The bedroom is also too narrow. On the other hand, the staircase has taken up too much space.

But if they want it that way, that's ok. After all, construction companies think like that too.

But if they want it that way, it's okay. That's also how construction companies think.

I would advise finding a trusted person with experience to advise you during the construction. It should not be someone who makes money from you, but perhaps a friend or relative.

...if you (sorry: only) have €500,000 available.

Have the costs for demolition and disposal of the existing structure even been calculated? What is the plan there? Did I overlook that?

Have the costs for demolition and disposal of the existing structure even been calculated yet? What is the plan there? Did I overlook that?

The basement or the foundation of an existing building has a condition that should be examined. Then you at least have a preview of the cover page of a geotechnical report. Worst case scenario is that the foundation will turn out to be very costly – or a basement says, "at least use me as a storage and utility room." Demolition is never free, and deep demolition even less so.

I would advise finding a trusted person with experience to advise you during construction. It should not be someone who makes money from you, but perhaps a friend or relative.

Acquiring and maintaining competence has cost and continues to cost. Should we, in your opinion, also drive taxis on the side in order to offer engagement as freelance construction consultants purely on a volunteer basis? – beyond my open consultation hours in forums, I could not manage that, and among my colleagues, I know none who work pro bono at all. These myths in packages come precisely from family, friends & fools: that solid houses are more solid and prefab houses are finished faster, that general contractors pass on mixed calculations and quantity discounts, that weight would best insulate sound, and all sorts of other indestructible nonsense. That’s supposed to help those in need of advice, seriously?
Should the original poster then drive out the devil with Beelzebub (i.e., buy "L-blocks" at the price of a basement) or build a bungalow because that saves the expensive stairs?