You have to pay extra for individual planning?
At least partially. For moving the wall between the kitchen and hallway (we hadn't even asked about a door there yet), they had pre-checked, and it was said, for example: Yes, in principle it's possible and "The specialist planner HLS would have to recalculate the heating load of the two rooms, about 1.5 hours of planning effort." [and if it is to be implemented that way, they can gladly send us an offer]. We only requested the offer today (because we wanted to be more certain about what we want before asking for about 5 variants), so I don't yet know exactly what it will cost us. The door will be an additional cost too :)
Ultimately, there is the standard plan. If no one raises any special requests or a terraced house is not yet sold, before construction starts, then the whole block of terraced houses, or even both blocks, is built according to plan F. (and the semi-detached houses have a very similar plan in part too) So it is one plan for about 16 houses or so. They only have to plan and calculate once, and then it is applied x times. (That’s also not unusual for such a model, even with other terraced house providers when they develop a whole project.) If you stick close to the standard, it can certainly be attractively cheap. But the more you deviate, the less worthwhile it quickly becomes. But from everything we have seen, the extent of individual planning is mostly limited to "yes, you can move the drywall partitions and relocate the sockets," which is more or less the norm.
Regarding the staircase, at least at first sales said "the staircase is fixed," and combined with "we see the same straight staircase in all floor plans in the development area," I just don’t have much hope there, or if they would do it at all, I expect higher surcharges. And I also see a certain risk with too much individual planning there. Personally, I’m still wavering whether I even prefer that or not, at least on the ground floor. (And upstairs I see the tailspin) And there I’m just in the "why bother" zone... My husband says "at least we can ask, we don't have to do it," but when I said "okay, then you take care of it," nothing happened :p Well, I want to get an offer for the window first, as well as 1-2 other things we requested. Then we’ll see how much money and motivation I have after that ;)