A registration method of a central control unit belonging to a home automation installation, the home automation installation comprising a plurality of home automation devices and a plurality of central control units (U1, U2), each central control unit (U1, U2) comprising at least one processing unit for containing and executing at least one computer program, each central control unit (U1, U2) further comprising at least one communication module intended to monitor and/or control at least one home automation device, each central control unit (U1, U2) further comprising at least one communication module with a management unit (Sv); the method being executed by a management unit (Sv) connected to the at least one home automation installation and comprising the following steps: i. Receiving (ERSv1) a first registration request message of a first central control unit for the installation transmitted by a first central control unit, or alternatively by a user terminal, in connection with a first identification information IID1. ii. Obtaining (ERSv2) a first attachment information of the first central control unit to a representative entity (St) of a home automation installation. iii. If the first attachment information corresponds to an absence of attachment of the central control unit to a previously recorded installation, creating (ERSv3) a representative entity (St) of the installation and attaching the first central control unit to said representative entity (St). iv. Receiving (ERSv5) a second registration request message of a second central control unit for the installation, issued by the second central control unit, or alternatively by a user terminal, in connection with a second identification information. v. Obtaining (ERSv6) a second attachment information of the second central control unit to a representative entity (St) of a home automation installation. vi. In the case where the second attachment information corresponds to an attachment to a representative entity of an installation comprising the first central control unit, attaching (ERSv7) the second central control unit to a representative entity (St) of the installation to which the first central control unit is also attached, wherein the representative entity (St) of the home automation installation is associated to a group of devices (DGrSt) grouping the devices contained in at least one first device group (DGrU1) attached to the first central control unit and at least one second device group (DGrU2) attached to the second central control unit, wherein the first and/or the second attachment information (IID1, IID2) comprise an identifier of a central control unit already belonging to a representative entity (St). i. Receiving (ERSv1) a first registration request message of a first central control unit for the installation transmitted by a first central control unit, or alternatively by a user terminal, in connection with a first identification information IID1. ii. Obtaining (ERSv2) a first attachment information of the first central control unit to a representative entity (St) of a home automation installation. iii. If the first attachment information corresponds to an absence of attachment of the central control unit to a previously recorded installation, creating (ERSv3) a representative entity (St) of the installation and attaching the first central control unit to said representative entity (St). iv. Receiving (ERSv5) a second registration request message of a second central control unit for the installation, issued by the second central control unit, or alternatively by a user terminal, in connection with a second identification information. v. Obtaining (ERSv6) a second attachment information of the second central control unit to a representative entity (St) of a home automation installation. vi. In the case where the second attachment information corresponds to an attachment to a representative entity of an installation comprising the first central control unit, attaching (ERSv7) the second central control unit to a representative entity (St) of the installation to which the first central control unit is also attached, wherein the representative entity (St) of the home automation installation is associated to a group of devices (DGrSt) grouping the devices contained in at least one first device group (DGrU1) attached to the first central control unit and at least one second device group (DGrU2) attached to the second central control unit, wherein the first and/or the second attachment information (IID1, IID2) comprise an identifier of a central control unit already belonging to a representative entity (St).