Kernrechtsfrage
Whether the public-law appeal was sufficiently reasoned to challenge the cantonal finding that no prior price agreement existed for the additional plastering work and that SIA 118 had not been shown to apply.
Extrahierter Entscheid
The complaint did not meet the constitutional motivation requirements because it merely opposed the cantonal findings without demonstrating arbitrariness.
Extrahierte Begründung
The Federal Court is bound by the factual findings unless arbitrariness is shown. The appellant introduced a new theory based on SIA 118 without showing that the cantonal court's contrary findings were arbitrary.