Abstract: A molded synthetic electrical box formed of synthetic resinous material preferably using one-piece molding techniques is mountable in walls and ceilings for enclosing the ends of sheathed electrical conductors connected to a switch or socket within the hollow interior of the box. The electrical box has an integrally molded flange extending around the outside of the walls of the box and parallel to an open front face. The flange is set back from the open face so that the open face will be flush with the interior surface of an interior wall. The flange is capable of being secured to the wall material or to a vapor and air barrier of the building wall by, for example, a suitable adhesive so that moisture and air can not cross the box. The box is further provided with alignment spacers so that it can be alignedly mounted to a surface in a rigid building wall surface.