There are so many small levers where you can save if you want or have to. But this "can't be done" or "then I have to reschedule" are excuses when the need is not yet great enough. At least in my opinion.
Well, for us, the garage is also planned in the basement. A plan change shortly before construction start would be absolutely uneconomical at the current planning status, even if the basement were omitted.
- The structural analysis would have to be recalculated
- Working drawings would have to be changed
- The architectural design would have to be submitted and approved
- Possibly construction delays
Due to the substantial change of the house, there may also be problems with financing, since the lending value might change as a result of the revised appraisal.
If one is still in the preliminary design phase, it naturally looks different.