Order documents
The contract, specifications, receipt, installation acceptance certificate and warranty documents.
Defects and inquiries
Dated photographs, videos, defect notices, the contractor's replies and records of repeat work.
Examination
An inspection record or specialist report may be one of the materials used in a dispute; it does not replace an examination ordered by the court.
Questions and time limits
Claims against the seller or contractor and procedural steps depend on the contract and the circumstances of the specific case.