We are planning to build in 2022; the planning begins

Schedule? What exactly do you mean by that?

How things are progressing. So:
KW XX: Set up house
KW XX: Submit building application
KW XX: Determination of ancillary building costs
KW XX: Muster inspection
Etc.

Such a thing does not exist because too many factors can influence the schedule.

Now it is time to create a project that you like. Then follows the preparation of the building application. That takes about 3 months.
During this time there is time for the selection of materials. Roof tiles, window colors, doors, tiles, sanitary fittings, etc. The additional cost must then be taken into account. However, it is not counted as part of the ancillary building costs.
That is why you build a buffer into the financing. For example, 15000. This compensates for the selection of materials and additional costs.
You can also first do the selection of materials and then create financing with the total amount.

Determination of the ancillary building costs and costs for the outdoor facilities is done by you or the financial advisor. Often the house building company can also help to estimate.
Normally with us here it is about 20000 each. If you have to do a clearing and forest conversion you should add amount X.

But there will be no schedule for that. It only exists when the financing is in place and the building application is approved.
Electricity and water must be available. Then there is a plan for when it starts and a chronological sequence.

You can just Google him - there are supposed to be people who use the same nickname in several places - and some also as an email nickname, which I cannot confirm in his case, but also would not rule out. In any case, I have the impression that you might think similarly in some areas if I let your thread histories pass before my mind's eye.

He was later still to be read in the Green :)