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Article L3135-1 of the French Public procurement code

A concession contract may be amended without a new competitive tendering procedure, under the conditions laid down by decree in the Conseil d’Etat, when:
1° The amendments were provided for in the initial contractual documents;
2° Additional works or services have become necessary;
3° The amendments are made necessary by unforeseen circumstances;
4° A new concessionaire replaces the initial concessionaire under the concession contract;
5° The amendments are not substantial;
6° The amendments are minor in amount.
Whether they are made by agreement or, in the case of an administrative contract, by the purchaser unilaterally, such modifications may not change the overall nature of the concession contract.

Original in French 🇫🇷
Article L3135-1


Un contrat de concession peut être modifié sans nouvelle procédure de mise en concurrence, dans les conditions prévues par décret en Conseil d’Etat, lorsque :
1° Les modifications ont été prévues dans les documents contractuels initiaux ;
2° Des travaux ou services supplémentaires sont devenus nécessaires ;
3° Les modifications sont rendues nécessaires par des circonstances imprévues ;
4° Un nouveau concessionnaire se substitue au concessionnaire initial du contrat de concession ;
5° Les modifications ne sont pas substantielles ;
6° Les modifications sont de faible montant.
Qu’elles soient apportées par voie conventionnelle ou, lorsqu’il s’agit d’un contrat administratif, par l’acheteur unilatéralement, de telles modifications ne peuvent changer la nature globale du contrat de concession.

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