Single-family house 172 sqm with garage and sauna

I basically think it’s great when someone designs a house based on their own living preferences rather than on what is commonly done.
I do know about a pass-through bathroom from two houses, of course, we always liked to laugh about it, but the respective families lived very well with it. You just close two doors and that’s it.
A sauna in the garden area is a great thing. Instead of putting it (expensively) in the garage, I would plan and apply for a separate sauna house.
Regarding the budget, I am also very skeptical that you can make it with the budget. An architect tends to be optimistic, and when the details are discussed, the limits are exceeded.

For wellness purposes, the positioned portable toilet reminds me of that.

Are you sure that your interpretation is correct? One could build according to that, right?

I am sure that it is not an interpretation, as my quote comes directly from our currently valid development plan. Of course, I do not know whether the current municipality sees it the same way as you...

When measuring the eaves height, you start on the ground/soil, then go up to the point where the roof meets the exterior wall.
With a room height of 2.75 and a ceiling height of 25/30cm (from top of finished floor), you already have your maximum 3.00 meters.

Maybe the architect should take care of everything, so he should have been involved right from the zoning plan stage?!

The architect has been involved from the beginning; without him, we wouldn't have been able to calculate this house. It all depends on the number of storeys, and as stated, the eaves point is cited and defined in our zoning plan exactly as it is drawn in our cross-section. If anyone complains, I just have to pull out the zoning plan.

The architect has been involved from the very beginning; without him, we wouldn't have been able to calculate this house. It all depends on the number of floors, and as I said, the eave point is cited and defined exactly like that in our development plan, as also shown in our cross-section. If someone complains about it, I just have to take out the development plan.

I’ll believe that only when I see your building permit.
The planned house has nothing to do with a bungalow.
Not that I don’t wish you well, but before you invest too much planning effort here, show the whole thing to the building authority.

The eaves height of the single-story main building must not exceed 2.75 - 3.00 m (measured from the top edge of the plinth to the bottom edge of the gutter)

A simpler explanation for the eaves height of a house is as follows: The drip edge of the house can be referred to as the height of the eaves. This means the roof eaves themselves. The gutter is usually attached at this roof eaves because all the water accumulated on the roof runs off at this point. Nevertheless, one should not generalize and equate the height of the gutter with the eaves height.
Source: Massivhaus.de