A configurable electrical box comprises an electrical box having a wall structure that defines an internal space, a front open end, and a rear open end. The wall structure comprises at least one pair of opposing walls. In addition, at least two slots disposed through at least one wall of the pair of opposing walls. A dividing plate is slidably coupled with one of the at least two slots and is positionable between an engaged position and an unengaged position. The dividing plate is in contact with both of the pair of opposing walls when in the engaged position.