Questão jurídica principal
Whether the cantonal court arbitrarily found acceptance of the supplementary offer of 29 September 2005.
Decisão extraída
The finding was not arbitrary; given the prior tacit acceptance of earlier offers, the homeowners had to object if they did not accept the additional works.
Fundamentação extraída
Under Art. 6 CO and the circumstances of the project, silence could reasonably be treated as acceptance; the homeowners did not show an arbitrary factual assessment.