Questione giuridica chiave
Whether Art. 8 CC was violated by accepting the contractor's claim without pericial proof
Decisione estratta
No. Art. 8 CC does not determine the assessment of evidence or require a specific type of proof; the cantonal court could rely on the client's pre-litigation and litigation conduct.
Motivazione estratta
The lower court did not decide in the absence of evidence, but on the basis of an evidentiary assessment under cantonal procedure and good faith; direct or indirect proof, including conduct, may suffice.