ᐅ Maximize the allowable floor area ratio, build over the terrace

And what is the correct wording?

A floor area ratio of 0.3 is specified, with a 50% exceedance allowed for ancillary buildings, so this is "quite standard."
As far as I can tell, this is the rule at least in our area. Exceptions confirm the rule but are explicitly listed. Furthermore, an ED house type is permitted, and as already mentioned, an eaves height of 6.5 m (21 ft 4 in) and a ridge height of 8.5 m (27 ft 11 in). Any roof shape is allowed except flat and barrel roofs. Oh yes, a maximum of 2 full storeys.

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

FCAEVFANAUG schrieb:

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

You just have to recognize where the limit is. If someone comes to you and says, I want Requirement A, B, C, ... then that’s good. But if they say the code should be indented at specific points, and Variables A1, B5, and C7 should be used, those are unnecessary constraints for you that don’t improve the final product.

Therefore, don’t go to the architect and say "I want an indented terrace" (which is already a possible solution for the requirement), but say "I have 610m2 (6566 sq ft) and want to create living space for 5 people. That includes an accessible living unit with at least 75m2 (807 sq ft). Furthermore, there should be a walk-in closet, the children’s rooms should be bright, I need a quiet home office, and so on..."

So, write down real requirements and don’t specify a possible (but maybe not optimal) solution from the start. I’m also experienced in requirements engineering, and nothing is worse than clients who don’t provide requirements but instead formulate a solution already. Convincing them that as an expert in a certain field you might know a better solution is often very, very difficult.

Terraces don’t add value with 5 kids? 😱
They normally live outside anyway.

If I’m causing your reaction, I probably didn’t express myself clearly.

Of course, we will have a terrace (or rather a covered outdoor seating area, since it will be roofed) and a garden, and of course kids spend a lot of time outside. What I actually meant was that, since terraces unfortunately count fully towards the gross floor area (GFA), if you have to manage the living space carefully, you inevitably have to choose between a larger floor plan or a larger terrace.
In my case, 183 m² (1971 sq ft) are available, so if I want a 50 m² (538 sq ft) terrace, only 130 m² (1399 sq ft) remain for the house (a simplified view, I’m aware that things like basement stairs, balconies, etc. might be added).
That’s why I’m considering creating additional space upstairs by “building over the terrace,” exchanging some brightness in the basement for more usable room.

That’s the architect’s responsibility. You need to provide them with the necessary information.
Five children’s bedrooms. Obviously, they need wardrobes, shelves, beds, and desks. But child 1 is an avid reader. So, one bedroom should have a bright reading corner and a 2m (6.5 ft) wide bookshelf. Child 2 does a lot of DIY, so their bedroom needs a second workspace by the window. Children 3 and 4 are inseparable and should initially have a large shared room that can be divided later. (This is not that unusual. I know a family where children aged 9, 4, and 1 still share the same room.)
Our bedroom bed measures 210 x 220 cm (83 x 87 inches), and we need 5 linear meters (16.5 ft) of wardrobe space — having a separate dressing room would be nice but isn’t necessary. Oh, and the 45 cm (18 inches) gap between the bed frame and the wall that we currently have is too narrow for us. This is how you create your room program, and how the grandparents create theirs.

Whether the architect fits all this into 140 square meters (1,507 sq ft), adds extra stories, or tells you clearly that your wishes are too ambitious and you need to cut back — that’s their job.

Pay close attention to how you differ from the typical family with two children when you provide your information. I think this is where most architects struggle.
I notice it myself when I’m at my friend’s place or when all the children are with me. The fridge becomes too small, the large frying pan and pot aren’t enough, my generous wardrobe is bursting at the seams, and so on.

Perhaps one more question: Garages are usually classified as secondary structures, thus counted under floor area ratio II. Does this generally apply if the garage is connected to the main house?

I know the development plan provides clarification on this, but it nowhere explicitly mentions "secondary buildings attached to the main building" or similar terms.

A friend of mine has a 90 m² (970 sq ft) garage with direct access to the main house, and it was counted under floor area ratio II, which would be very beneficial for my project as well.

But as you have pointed out several times, this is something the architect should know...

To my knowledge, garages are always considered outbuildings. It might be different for garages that are part of or attached to the main building.