The present invention relates to a method for controlling access to a user service (Svc1) intended to control a home-automation installation (Su) comprising at least one home-automation device (D) and at least one central control unit (U), the method being implemented by a managing unit (Sv) and comprising the following steps: a step (Escv118) of receiving from a maintenance user (Usr2) a request to access the user service (Svc1) as a final user (Usr1), based on an identifier of the final user (Usr1ID) and an authentication token (Tk1D); a step (ESvc119) of verifying the validity of the authentication token (Tk1D) via a repository (SvAuth) for authenticating token validity, in order to authenticate as a final user (Usr1) with a view to access to the user service (Svc1); and a step (ESvc122) of authorising access of the maintenance user (Usr2) to the user service (Svc1) as final user (Usr1) if the identification token (Tk1D) is observed to be valid.