The wall cover plate assembly includes a base and a cover for connecting to an electrical box and an electrical wiring device. The base is connected to the electrical box and/or the electrical wiring device by suitable fasteners. The base includes a first coupling member positioned along opposite side edges and second coupling members positioned at each corner of the base plate. A cover includes a first coupling member for engaging the first coupling member on the base plate and connectors for engaging the second coupling members on the base plate. The connectors of the cover are angled with respect to a plane of the cover to engage a connecting member of the second coupling members. The connectors provide a biasing force to engage the second coupling members of the base which increase when the cover plate is pulled outwardly from the base.