Floor plan & positioning Single-family house approx. 150 sqm 2 full floors Gable roof

No, correct! Let him do it and gain his experiences. There is no other way.

I do let him, or am I stopping him with my notorious thug squads? I just lack the sadism to let him run into the knife of frustrating experience. And above all: it is simply not purposeful. There are already upper floors that the OP likes / approves of; and they have ground floors that do not convince him. So it is more useful to work out where their points of dissatisfaction lie. I have not imposed any thinking bans. I merely point out what effects are to be expected from a "bottom-up" development of floor plan layouts (and that these effects are system-inherent, thus by no means due to the layman status of planners). The layman-specific aspect lies only in the mindset of paying greater attention to the more whimsically seasoned floor. The experienced / frustration-averse planner instead plays lazy and prefers to derive the less complexly structured floor from the more complexly structured one. Whoever wants to can see in this, in a free country, a matter of convincing taste. I only share my experience, transparently with the accompanying reasoning, for the independent builder to understand for themselves.

or do I keep him away with my notorious bat squads?

No, but with a dropped exclamation mark! It's basically the same, just digital.

So first of all, thanks for patiently explaining the EG/OG planning sequence, ypg and 11ant. I will try to take that to heart, as there is still quite a bit to optimize, as I have realized.

A technical room upstairs is rather out of the question; we are not adventurous enough for that. More likely an extension of the technical room outside the insulated building envelope -- although I don’t know where to put it, it would disturb everywhere in the north and block light. Or what we are currently considering: reduce the technical room to 6 sqm, utility room in the upper floor, possible photovoltaic technology (inverter, battery) in the garage.

Ich suche berufsmäßig Architekten (aber diesen Monat nicht mehr, melde Dich trotzdem).

If I don’t find one in the next two weeks, I’ll do it, thanks.

Nein, die Kellerregel beantwortet nicht die Frage, ob ein Keller nötig wäre. Sondern die Frage, wie sich die Kosten eines Kellers auf Kellerbaukosten und Geländemodellierungsersparnis aufteilen. Wenn das Grundstück tatsächlich eben ist, kostet ein Keller 100% Kellerbaukosten minus 0% ersparte L-Steine und Geländemodellierung. Dann ist im Ergebnis oberirdischer Kellerersatzraum günstiger.

Ok, now I understand. Still then: no basement.

Ein Besengang nur um das Hammerschlagsrecht nicht in Anspruch zu nehmen wenn man alle zwanzig Jahre mal die Wand streicht ist mit "Luxus" noch nett umschrieben, das grenzt schon an Dekadenz. Falls der Nachbar oder sein Nachfolger weitgehend winddicht einfriedet, hat man da eine 1a Laubsammelschneise.

Good point. I have to look into the legal meaning of that. A short route from garden to driveway in case the garage is blocked, storage for ladders, wood, etc., and above all being independent from the neighbor would speak in favor of that.

A flat table and 10 degrees are certainly not the same.

I'll bring up my remark again. You do realize that 10 degrees is no joke. Is there a plan with height indications so the slope can be seen? At 10 degrees, according to 's rule, a basement makes sense. Otherwise, only build with a basement and ground floor, if that is an alternative.

A technical room upstairs is rather out of the question; we're not experimental enough for that. More likely an extension of the technical room outside the insulated building envelope -- although I wouldn't know where to put it, it would disturb everywhere in the north and block light. Or what we are currently considering: reducing the technical room to 6 sqm, utility room upstairs, possible photovoltaic technology (inverter, battery) in the garage.

Nonsense. Entry for utilities at the bottom and the actual technical room upstairs is not an experiment; a technical room outside the thermal envelope would be more like that. Most (space-saving) room is needed for areas related to the safety of maintenance personnel.

If I don’t find anyone in the next 2 weeks, I’ll do it, thanks.

Your waiting time cannot start before you are on the waiting list.

Good point. I have to check legally what that means. Short route garden -> driveway in case the garage is locked, storage for ladders, wood, etc., and especially independence from the neighbor would speak in favor.

Brief summary of hammer right: the neighbor must tolerate you painting your garage wall; you must notify him of your visit with appropriate advance notice, and you must restore any flower beds you have trampled afterwards.

I'll bring up my comment again. You do realize that 10 degrees is not nothing. Is there a plan with elevation data so one can see the slope? At 10 degrees, according to @11ant’s rule, a basement pays off. Otherwise, only build with a basement and ground floor if that is an alternative.

I suppose it means that the north-south axis lies aeronautically at 35/17, and the terrain is topographically flat.

Otherwise, 10° terrain slope over ten meters is just about one point eight zero, corresponding to 90% basement construction costs, yes.

We have now received the first draft from the planner. On the ground floor, my initial draft was adopted almost 1:1, although this was not even required. The following should now be changed from our point of view:

Ground floor:
- Fireplace will be moved to the corner of the load-bearing wall between kitchen and dining area.
- Fixed installed (fireplace) stove will be planned with a width of 40-50cm, so that it functions as a room divider between dining area and living room instead of the wall. Length is still unclear, maybe 150cm?
- Orientation of couch and TV reversed. Couch is placed against the office/guest room wall and TV hangs on the fireplace.
- Kitchen possibly an additional narrow window on the north side, near the corner of the house.
- Hallway width reduced by 10-15cm away from the wardrobe (currently 140cm).
- WC/bathroom reduced in width. For example, by having the shower as a niche extending into the technical room at the back. Width towards the door only 1.2m?
- Kitchen: Width along the north side should be 3.1m instead of 3m, so that a 65cm corner cabinet and otherwise exclusively 60cm cabinets can fit.
- Kitchen: unclear if there is a bottleneck between hallway corner and "bar."
- Technical room: unclear if too small.

Upper floor:
- Laundry chute probably obstructs the middle of the bathroom.
- Staircase: large window starting at the step.
- Master bedroom: entrance through the closet. Closet wall starts from the exterior wall.
- Revisions needed in children’s rooms regarding new position of fireplace.
- Windows in master and children’s rooms: only one larger window each, only on south or west side.

Outdoor area:
- Terrace: continuous 3.5m paving and roofing towards garage, no “hole.” Therefore shorten roofing on the west side.
- Decorative elements on exterior facade and entrance area probably will not be realized. The exterior view certainly will not win a beauty prize. If cost permits, I would consider partial facade cladding (aluminum or larch wood?).