Single-family house - Design planning - Request for feedback

Are points a) and c) clarified?

A square is also a rectangle. However, the provisions here overall indicate that exceptions must have been applied for the house originally planned for the foundation slab.

Therefore, I want to stick to it as much as possible. That is why the architect also shortened the upper floor.

That is of no use for 2.1.b: "Eaves and gable side" (of the building) does not refer to the roof or upper floor alone.

What about the thermal bridge if the foundation slab is 12.49×12.49m and the corner is recessed in the drawing of the building?

Uh ... what does the architect do for a living? If there are no "isokörbe" where the terrace adjoins the thermal envelope, in my opinion you can forget the design. But that will probably have been solved in the old design—or that is already the mistake because of which the previous owner gave up.

I still think .. wait and see what the preliminary draft says.

And

I have discussed this with the municipality. According to their statement, it will not be an exemption.
I am supposed to provide drawings that adhere as much as possible to the development plan. For points that do not meet this, a special permit is required.

I consider this really questionable. You then need a professional who also covers the non-compliance points so that a special permit can be granted.

But this will presumably be resolved in the old draft - or that is already the mistake for which the previous owner gave up

.. the latter was also my suspicion.

If there are no "Isokörbe" where the terrace borders the thermal envelope, you can basically forget the design in my opinion.

Can you explain to the layperson what Isokörbe are and why the design is then worthless?

"Isokörbe" (R) are thermal insulators at transitions between reinforced concrete components between exterior and interior (such as between the floor slab and its cantilever as a porch roof). If this separation is missing, a thermal bridge occurs. I could imagine that this already significantly affects compliance with the Energy Saving Ordinance 2016. At least, if the planned terrace is to remain within the single-piece floor slab.

Is it not possible to insulate the part of the base slab that is outside? The side walls of the base slab are also insulated.

Can't the part of the slab that is outside be insulated?

This part would still be "outside".

The side walls of the slab are also insulated.

Just not at the terrace / house boundary. I see you would have to incorporate the terrace area into the thermal envelope (or cut out the corner).