Erkan, Vehbi UmutGüvenç, İpek2021-11-232021-11-232021http://hdl.handle.net/20.500.12575/76299The substantial elements of a work contract include the creation of a work and the payment of a consideration in return. The obligation to pay a consideration, as the primary obligation of the client, may be agreed by the parties as a lump sum price when concluding the contract. Through this lump sum price which is not alterable in principle, the client is aware, well in advance of the due date, of the amount that must be paid to the contractor upon completion of the work, whereas the contractor is similarly aware of the amount earned/accrued. Where circumstances arise which parties have not foreseen or have foreseen but ignored when concluding the contract, and the balance of performance in the contract is tilted to an extent where the contractor cannot be expected to bear, the contractor may file a request for adaptation of contract with the court. This study examines under what circumstances a request for adaptation may be filed for a work contract of lump sum price due to changing conditions under Article 480/II of the Turkish Code of Obligations. Where, for a lawsuit instituted with a request for adaptation of a work contract, the court decides that the contractor cannot be expected to bear the burden of specific performance and the contract cannot be adapted, the contractor is entitled to terminate the work contract. The Turkish Code of Obligations prioritizes the request for adaptation of a work contract, but entitles the contractor to terminate the contract for circumstances where adaptation is not possible.trEser sözleşmesiGötürü bedelSözleşmenin uyarlanmasıAşırı ifa güçlüğüEser sözleşmesinin sona erdirilmesimasterThesis