Utilize the plot ratio for new construction, build over the terrace

And what is the correct wording?

A floor area ratio of 0.3 is specified and a 50% exceedance is possible for secondary facilities, so "completely normal." As it seems to me, this is at least the rule in our area. Exceptions confirm this but are explicitly listed. Furthermore, an ED house type is permitted and, as already mentioned, eaves height of 6.5m and ridge height of 8.5m. Roof shapes are all permitted except flat and barrel roofs. Oh, yes, max. 2 full storeys.

Of course, the house will be planned by an architect; I just want to inform myself in advance since that speeds up the decision-making process. A bit off-topic, about me: I am a programmer; when someone comes to me with quite precise ideas about what the program should do, fewer "adjustment loops" are needed than when someone only expresses their wishes generally and roughly.

I am a programmer; if someone comes to me with fairly precise ideas about what the program should do, fewer "adjustment loops" are needed than if someone only roughly and generally expresses their wishes.

You just have to see where the boundary is. If someone comes to you and says, I want Requirement A, B, C, ... then that's good. If they come and say, but the code should be indented at defined points, variables A1, B5, and C7 should be used, those are unnecessary restrictions for you that do not make the end product any better.

Therefore, don’t go to the architect and say "I want an indented terrace" (that is already a possible solution for the requirement), but say "I have 610m2 and want to create living space for 5 people on it. Of that, one age-appropriate residential unit with at least 75m2. Furthermore, there should be a dressing room, the children's rooms should be bright, I need a quiet office, etc. ...

So write down real requirements and do not specify a possible (but maybe not optimal) solution already. I am also at home in requirements engineering, and nothing is worse than clients who formulate not a requirement but already a solution. Convincing them that as an expert in a certain field you know better solutions is often very, very difficult.

Terraces no added value with 5 kids? :eek: They live outside normally.

If I provoke your reaction, I have probably expressed myself poorly.

Of course we will have a terrace (or then a covered/semi-enclosed seating area) and a garden, and of course children spend a lot of time outside. What I was really getting at (since terraces unfortunately completely count towards the living area in GRZI) is that if you have to manage the living space, you inevitably have to decide – a larger floor plan or a larger terrace.
In my case, 183 sqm are available, which means if I want 50 sqm terrace, 130 sqm remain for the house (only simplified, I am aware that maybe the cellar entrance, balconies, etc. are added).
That’s why I am considering "building over the terrace" on the upper floor to gain space in exchange for brightness in the basement.

That is the architect’s matter. You have to feed him with information. 5 children’s rooms. Of course they need a closet, shelf, bed, desk. But child 1 is a bookworm. So add 1 children’s room with a bright reading spot and a 2m wide bookshelf. Child 2 crafts a lot, so 1 children’s room with a second workspace in front of the window. Child 3 and 4 are inseparable and should first get a large room that can later be divided. (that’s not so unusual. I know a family where the children 9,4,1 don’t want to move out of the shared room) Bedroom our bed is 210 x 220 cm large, we need 5 running meters of wardrobe – a private dressing room would be nice but is not necessary – oh yes and the 45 cm between the wall and the bed frame that we currently have is too little for us. This is how you create your room program and the grandparents theirs. Whether he fits it into 140 sqm or through superstructures or he tells you flat out that the wishes are too many and you have to cut back is his job for now. Pay close attention to where you differ with 5 children from the classic 2-child family in the information. I think that is the point where every architect struggles. I see it when I am at my friend’s or when all the children are at my place. The fridge becomes too small, the large pan and the big pot are not enough, my generous wardrobe bursts at the seams, and so on.

Perhaps one more question: Garages are usually classified as ancillary areas, thus floor area ratio II. Does this also generally apply when connected to the main house?

I know the development plan provides clarification on this, but nowhere is there an explicit mention of "ancillary buildings attached to the main building" or similar.

My acquaintance has a 90 sqm garage with direct access to the main house and this was counted towards floor area ratio II, which would also be very advantageous for my project.

But as you have often mentioned, the architect must also know this...

Garages are, to my knowledge, always outbuildings. Perhaps it looks different with built-over garages.