The law is basically completely harmless as long as you formally note all defects known to you during acceptance in writing.
No, the law is restrictive in this distinction: No rights without reservation!
Just recording is not enough.
In practice, this is handled sensibly by reasonable companies.
The acceptance declaration has several consequences:
** Due date of payment
** Fulfillment phase ends, warranty phase begins
** Start of the limitation period
** Reversal of the burden of proof (in court) for defects (!)
With acceptance, you say: "Okay, that's fine."
Therefore, you should also raise defects visible
at (!) the acceptance, not afterwards.
If there are minor defects, you basically say:
"Okay, fine, except for... I want this to be rectified contractually by..."
Legally, this is still the original claim for performance.
Defects
after acceptance: warranty claims.
And yes, after the reservation, the second most important thing is:
Put defects in the record!!!
Do not be talked out of it and insist on it.
The general contractor can certainly dispute the defect – but only afterwards or possibly already in the record.