A box cover for an electrical box comprises a faceplate having a height and width that corresponds to a height and width of the electrical box, a sidewall extending from a rear surface of the faceplate, and a securement assembly that is adapted to interconnect with the electrical box and secure the cover thereto. When the cover is secured to the electrical box, the sidewall contacts the box wall along substantially the entire length of the box wall thereby creating an interior cavity. An electrical fixture may be electrically connected to one or more electrical conductors within the electrical box, and placed in the electrical box. The cover may then be secured to the electrical box, thereby providing a protective cover for the electrical fixture.