An electrical box has a back portion with a back wall and various side walls. Coupled to the back portion is a sliding ring portion having various side walls. The sliding ring portion is slidably mounted on the back portion such that there is an extended position with a first depth and a collapsed position with a second depth where the first depth is greater than the second depth. Prior to installation, the electrical box would be in the collapsed position in order to minimize the space occupied by the electrical box. When installed, the electrical box would be used in the extended position, such that the full depth of the electrical box can be used.