According to Law no. 913 of 30.03.2000 condominium for the housing stock, Art. (10):

  (1) The association of co-owners, with a 2/3 meeting of the total number of votes, may adopt the decision to improve the comfort of the building, including the installation of hot water boilers, central heating, lifts, etc. Regardless of the nature of the interventions, the harmonious and unitary appearance of the entire building will be maintained.

   (2) The owner may make improvements or alterations to his / her dwelling (room) without jeopardizing the structural integrity of the building or other owners' rooms, and changes in engineering communications starting from technical possibilities. The owner cannot change the appearance of the common property without the consent of the co-owners association.

   (3) The walls between the adjoining rooms, which are not part of the structure of the building, may be changed by agreement between the owners of the respective premises and the notification of the association of co-owners. The walls, the walls between the rooms and the common property, which are not part of the structure of the building, can be changed only with the consent of the association of co-owners.

   (4) Reconstruction and modernization of buildings, modifications of dwellings (rooms) shall be carried out in accordance with the approved project documentation in the established manner, based on the opinion of the technical expertise, carried out by certified specialists, at the request of the joint owners association and with the consent of the local public administration authority .

More details can be found in Law no. 913 of 30.03.2000 condominium for the housing stock