Questione giuridica chiave
Whether the cantonal court arbitrarily assessed the evidence on the value of the work under Art. 374 CO and Art. 9 Cst.
Decisione estratta
No arbitrary assessment was shown; the court could rely on the architect's testimony and the private valuation report.
Motivazione estratta
A mere conflict between the builder's and architect's estimates did not establish a manifestly untenable finding. The contractor bore the burden of proving the facts relevant to the price.