Floor plan design single-family house on a slope, granny flat, double garage

You want to build in Bavaria, right? The building code clearly specifies accessibility for practice rooms. BayBO Art. 48 Barrier-free building.

That probably doesn’t work without an elevator either. :p I already wrote how it’s done in my neighborhood. Practice on the ground floor. Ergo, the architect has to take another look.

Unfortunately, we have somewhat drifted away from the original topic of the floor plan within the thread.

Here I quote the "former ruler": "and that is a good thing." What use is it if the property has the slope for the granny flat – but the builder does not have the money. One should not indulge in the daydream that the additional KfW subsidy will pay for the granny flat all by itself. By the way, it is not the business of this Marshall Plan institution to promote the economy, but the granny flat is subsidized because it is residential space. This does not mean writing "residential" in the practical room on the building permit plans. Rather, it is to be expected that proof of rental of the living space (or serious effort thereof) must be provided; otherwise, subsidies will be reclaimed. In the case of subsidy fraud, it is also to be expected that a license for a business requiring "personal reliability" would be revoked. And that would be silly if you were then only allowed to trade used cars in the basement apartment. By the way, authorities are task-focused, and their statements should be judged accordingly cautiously: a building authority employee may see no obstacle against a healing profession from a building law perspective (a §34 area is probably to be classified between a mixed-use area and a residential area in this sense) and therefore would not need to send colleagues from the regulatory office to prohibit the use from his point of view. But he has nothing to do with the rules for professional healthcare facilities and (presumably because under the jurisdiction of the district government) would not have met any responsible colleagues in the district office cafeteria. So free yourself from only recognizing "constructive criticism" in back-patting. Whether we here see your inclination for a granny flat as suitable by majority or even unanimously likely does not help at all in the final analysis. It is simply naive, on the one hand, to make your own table of area requirements that shows ten square meters saved between the design and the target for each floor, but on the other hand to say "now forget the money, I only wanted criticism on the floor plan." If money were no object, you could easily afford those thirty square meters in total – mind you, from your own pocket, and not from that of the KfW. Your project somewhat reminds me of that of

Thank you very much for the first feedback.
I would like to explain this as follows:
The waiting room is accessible via the stairwell/hallway. Marked as hallway/closet in the picture.
Opposite the hallway, there is a complete bathroom drawn, which is suitable as a "customer toilet."

The actual practice is then to be located in the kitchen/dining/living area. The rooms can be separated if necessary, so that up to 3 treatment rooms could fit here if needed.

To be very specific about the floor plan: With potentially three treatment rooms, three potential sinks should also be planned. I get the impression that your plans are still in the preliminary idea stage, is that correct?

So I won’t say anything about the financial aspect for now – rather about the division / general approach.

Personally, with a 1200 sqm garden, I would want to actually use it and definitely want direct access to it (especially if 3 children are planned).

That means I would pursue the approach: living in the basement with direct access to the garden and moving work to the ground floor/upper floor.

What I can also say: I would definitely not discuss such a complex project with these requirements “practice” with a general contractor’s planner, but first put a lot of planning effort into working with an independent architect to be 100% sure that everything works like that (unfortunately, the budget has to be included here. Just to compare with our project: we are currently in the planning phase for about 150 sqm plus carport and hope we can manage here (only for the building!) with 450k euros.

A friend of mine has set up a small hair salon in the basement. I am just wondering whether similar considerations regarding parking spaces, etc., have been made there. Nothing is specifically designated.

As a rule, existing cellar rooms are upgraded in order to integrate, for example, hair salons, etc. If this is done afterwards, no parking spaces have to be designated. This was also confirmed to us by the authorities. When I think about how it is found in our region, it is exactly as you described.

Well, a hairdressing salon as a secondary business is also something different from a practice. There are hygiene regulations from the health department as well as the aforementioned requirements for accessibility. The change of use from residential space to commercial space must also be reported. You cannot switch back and forth between residential use and practice use at will, depending on which brings more advantages.