SIA-Norm 118 Construction Measurement Approval Reliance

In a dispute arising from a construction contract governed by SIA-Norm 118, the central issue was whether the contractor could rely on the site management's approval of the measurement documents, given that the measurements were not conducted jointly on-site as typically required. The court reasoned that while joint on-site measurement is the general rule under Art. 142 para. 1 SIA-Norm 118, the norm does not specify where the measurement must occur, and the site management can agree to rely on the contractor's preliminary measurements, provided these are then checked together in the office using supporting documents like delivery notes and plans. Since the site management participated in establishing the final measurements based on the contractor's notes and subsequently approved the measurement documents and final invoices without reservation, the contractor was entitled to trust this process and rely on the site management's recognition of the quantities.