Inspection/Supplements

That depends on how diligently the office processes the additional items.

Regards

That always depends on your construction company. With a customer-oriented company that maybe didn't squeeze the price down to the last cent to get the job, you don't pay for small things extra at all (this was the case with us, for example). With bargain hunters, who are rumored to make money mainly from extras, the bill will quickly come with a large surcharge. Of course, everything in between is possible :)

it always depends. With us, no additional charge was added to the craftsman's surcharge. so it was passed on 1:1

We had a mix of everything, I think... some things we did before signing - that felt expensive, others during the construction - some were expensive, some (mostly) fair, and others were not charged at all.

That depends on how diligently the office processes the additional items.

That means a few weeks can go by. Should I expect that amendments will only be listed in the final invoice?

That means a few weeks can go by. Should I expect that additions are only listed on the final invoice?

Look at the company of the contractor. Or is it even your own subcontractor?
How are they staffed? How many people work in the office?
The smaller the company, the more complex the invoicing department. If someone there is absent due to illness, it can take a while.
Larger companies have personnel who can cover for each other.
If it also involves costs that were advanced, the gap must be quickly closed again with income.

But it can also be that some items, which were agreed upon on site with a handshake, are not forwarded.
Or the value of the item is not even worth issuing an invoice for. That is usually booked under service.
One should remember such services when there is trouble. That can help soothe and reminds that subcontractors are not only money-hungry, nor an inhuman machine.

Regards