An add-on compartment for a trash receptacle includes a open topped material receiving compartment having spaced apart front and back panels protruding transversely outwardly from one side of the compartment for receiving a trash receptacle between them. The panels extend outwardly sufficiently to overlie the walls of the trash receptacles so that the combination compartment and receptacle give the appearance of a unitary structure. A trash bag retaining lip is formed on the upper edge of the compartment and a depending skirt may be provided to cover at least the front wall and outer most side wall of the compartment to provide a smooth continuous appearance with the front panel and a trash receptacle to be received between the panels.