If special personal qualities were decisive, the works contract expires on the contractor's death.
Section 1171 ABGB links expiry to work for which the contractor's special personal qualities matter. Secure the agreement, scope of works and all arrangements concerning personal performance. These documents show whether the work can continue in its original form.
In this situation, the heirs may claim the price of prepared usable material and a part of the remuneration appropriate to the value of the work performed. The account should therefore identify usable material and the value of the work separately.