The legal framework in Switzerland
A solar installation on a roof is a construction work. In case of defect (infiltration, faulty fixing, poor sealing), the responsibility of the company is analyzed according to the signed contract, the Code of Obligations and, where applicable, SIA 118. The key point is to report the fault promptly and keep all technical evidence.
Payment, receipt and security hold
Avoid excessive deposits and plan for a final balance conditional on commissioning, electrical checks and acceptance of work. This withholding protects you if reserves appear just after installation.
Subcontracting and responsibilities
In the event of the intervention of several trades (roofer, electrician, PV integrator), require a clear distribution of responsibilities in the estimate. In practice, this clarity contractual greatly reduces disputes when a disaster occurs several months later the installation.