New construction: Warranty after limitation period in case of water damage?

Good morning,

we had water damage in our new build directly in the bathroom or rather in the shower because the installer forgot to connect the washbasin and the water flowed freely into the screed. The damage was then in the shower and the developer had to open everything up again, connect drain pipes, insulate, apply screed, seal, and retile.

So far so good, but:
Our tiler said that this is a really unfortunate spot for water damage and it will always remain a "weak point."
Damage may potentially only appear after years.

My question now is, how does that look then? Who would pay the costs? I think this would be a case for our building insurance?!
Do we now have to get some kind of note from the developer documenting the damage? They probably won’t be eager to do that... not.

Best regards
Benny

I see it similarly to you and would also initially think in terms of insurance. Definitely have it documented, better to have it than not, even if it’s annoying. As for the warranty, I think a lawyer would actually need to provide information on whether anything would still apply there.

Why should it be a vulnerability? It's just as much a vulnerability as all other connections. Be glad that everything was properly fixed. Others had dried the screed and that was it.

Damage has occurred - damage has been repaired. Case closed. Otherwise, normal warranty (on what?) of the general contractor/developer. Particular weak point? Please have it specifically explained by the tiler. From then on, he starts stammering and can no longer answer confidently...