Single-family house with a 75 sqm granny flat

The architect should make an effort.

If effort is enough at all. Effort is pretty much the opposite of estimating a building envelope. By the way, I have already suggested to the architect in the green forum that, as the lead planner, he has too little experience – that is not a favorable basis on which to expect the actions of an old hand.

Effort would be pretty much the opposite of estimating a building envelope.

Now don’t be so strict.

Based on a scale, our architect calculated the building envelope as 12x18.

He didn’t estimate at all – well, didn’t calculate either – but measured with a scale, and did so correctly. What else could one do when the building envelope is not dimensioned in the development plan.

Yes, bury 0.6m, fill 1m, that makes 2.6m, so one floor. In the worst case, you have to plan one or two steps to the south terrace. The architect should make an effort.

So, I'm missing 1m or can't follow you. But it doesn't matter.

What I also wonder: Should the balcony and outdoor stairs be within the construction area? If yes, would there be an exception for that?

So, I'm missing 1m or can't follow you.

If the contour lines in the development plan are still correct, then the northeast corner of the building plot is at 185m, the southeast corner at 186m, and the northwest corner at 184.4m. If you choose the ground floor floor height as 184.4m, you can step out onto the west terrace at ground level, which naturally cuts into the slope to the south, but only about 50-60cm. On the east boundary, you have to remove 40-70cm in the north for the garage entrance and the house entrance, which you fill up to 187m in the south. The terrain there is then 2.6m above the ground floor floor height. If you now play a bit with the centimeters, one step might be enough to step from the upper floor onto the south terrace.

Should balcony and outdoor stairs be included in the building area?

Yes.

If yes, would an exception be possible for that?

I think so, since even the winter gardens are allowed an encroachment.

If the contour lines in the development plan are still correct,...

Ah, I had overlooked the north-south slope. So that would actually be really cool. Unfortunately, I can’t represent it perfectly with my program (especially the 50cm on the west terrace are completely missing – please keep that in mind), but I think it should look something like this: The ceiling problem in the stairwell I fixed right away as well: The nice thing about it would also be that you’d have 2 separate terraces but could still all be together. And above all, everyone would have space and light in the rooms. And all the cars fit.

today we have another appointment with the architect.

How did the appointment go? Will you tell us what came out of it?