Hello,
the listing from the architect is enough for the banks. He calculates it according to certain specifications.
That means, for the bank it is sufficient if it is his listing, including stamp and signature.
If you do a lot of work yourself, have the architect split it as follows:
Trade A = €75,000 = €40,000 materials, €35,000 labor (and if you do some work yourself here = of that own work X)
and this consistently for all trades, so that it is plausible for the bank.
I have already arranged financing where €100,000 - €150,000 of own work was included. Good for the conditions.