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An electrical box extension includes a base, a movable ring and an extension ring. The base has an inwardly extending flange for coupling the base to the open end of an electrical box. The movable ring slides within the base and is captured by a screw that draws the movable ring into the base. The e

An electrical box extension includes a base, a movable ring and an extension ring. The base has an inwardly extending flange for coupling the base to the open end of an electrical box. The movable ring slides within the base and is captured by a screw that draws the movable ring into the base. The extension ring optionally can be coupled to the top end of the movable ring. A movable support flange can be coupled to the top end of either the movable ring or the extension ring for contacting the outer surface of the wall when the movable ring is drawn into the base.

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1. An electrical box extension comprising: a base having a top end and a bottom end, said bottom end being adapted for coupling to a support surface or an electrical box;a movable ring received in said base for sliding axially within said base, said movable ring having a top end and a bottom end, sa

1. An electrical box extension comprising: a base having a top end and a bottom end, said bottom end being adapted for coupling to a support surface or an electrical box;a movable ring received in said base for sliding axially within said base, said movable ring having a top end and a bottom end, said top end having a mounting flange for supporting an electrical wiring device, and said movable ring having a support flange with a dimension to contact an outer surface of a wall during installation of said electrical box extension; anda coupling member coupled to said movable ring and to said base, said coupling member adapted to retract said movable ring into said base and move said support flange into contact with the outer surface of the wall for supporting said movable ring. 2. The electrical box extension of claim 1, wherein said base has an inwardly extending coupling tab at said bottom end of said base, said coupling tab having a screw hole for coupling said base to the support surface, and where said coupling member is coupled to said coupling tab. 3. The electrical box extension of claim 2, wherein said coupling member is a screw and where said coupling tab includes a threaded hole receiving said screw. 4. The electrical box extension of claim 3, wherein said movable ring has an inwardly extending coupling, tab at the bottom end of the movable ring with a screw hole to allow said screw hole to slide through said screw hole. 5. The electrical box extension of claim 2, wherein said movable ring has an inwardly extending coupling tab at said bottom end of said movable ring and where said coupling member is coupled to said coupling tab. 6. The electrical box extension of claim 1, wherein said outwardly extending support flange is pivotally coupled to said movable ring to pivot between a retracted position and an extended position to extend outwardly from said movable ring. 7. The electrical box extension of claim 6, wherein said support flange is pivotable from a retracted position within an outer edge of said movable ring to the extended position where the support flange overlies a top edge of said movable ring. 8. The electrical box extension of claim 6, wherein said support flange has a first end pivotably connected to said movable ring and a second end with a stop member to limit outward pivotal movement of said second end. 9. The electrical box extension of claim 1, wherein said support flange is removably coupled to said movable ring. 10. The electrical box extension of claim 1, further comprising an extension ring coupled to said top end of said movable ring to extend the axial length of said movable ring, and where said support flange extends outwardly from a top edge of said extension ring. 11. The electrical box extension of claim 10, wherein said extension ring has a bottom end with a mounting flange coupled to a top end of said movable ring and a top end with an inwardly extending mounting flange for mounting the electrical wiring device. 12. An electrical box extension comprising: a base having a collar with an axial passage, a top end, a bottom end, and an inwardly extending coupling tab at said bottom end and being adapted for coupling said base to a support or an electrical box;a movable ring slidably received in said collar, said movable ring having an axial passage, an open top end, and an open bottom end, said open top end having an inwardly extending mounting flange for supporting an electrical wiring device in said axial passage, and an outwardly extending support flange coupled to said movable ring and having a dimension for contacting an outer surface of a wall during installation of said electrical box extension, said movable ring having a coupling tab extending into said axial passage; anda coupling member coupled to said coupling tab on said movable ring and to said coupling tab on said base, said coupling member adapted for retracting said movable ring and said support flange against the outer surface of the wall during installation of said electrical box. 13. The electrical box extension of claim 12, wherein said coupling tab on said base is provided on a bottom edge of said base. 14. The electrical box extension of claim 13, wherein said coupling tab on said base has a first hole for receiving a coupling screw for coupling said base to the electrical box and a second hole for receiving said coupling member. 15. The electrical box extension of claim 14, wherein said coupling member is a screw threaded into said second hole in said coupling tab, and where said screw slides through a hole provided in said coupling tab on said movable ring. 16. The electrical box extension of claim 12, wherein said support flange is removably coupled to said movable ring. 17. The electrical box extension of claim 12, wherein said support flange is pivotally coupled to said movable ring to pivot said support flange between a retracted position and an extended position. 18. The electrical box extension of claim 12, wherein said support flange is movable from a retracted position to an extended position. 19. The electrical box extension of claim 12, wherein said support flange is pivotally coupled to said movable ring, and has a stop member to limit pivotal movement with respect to said movable ring. 20. The electrical box extension of claim 12, further comprising an extension ring removably coupled to said top end of said movable ring to extend the axial length of the movable ring. 21. The electrical box extension of claim 20, wherein said extension ring has a top end with said mounting flange coupled thereto, and a bottom end with an inwardly extending coupling tab for coupling to said movable ring, and where said top end includes an inwardly extending mounting tab for supporting the electrical wiring device. 22. The electrical box extension of claim 21, wherein said extension ring has an outer dimension complementing the outer dimension of said movable ring. 23. An electrical box extension comprising: a base having an axial passage with an open top end and an open bottom end, said open bottom end having a coupling tab for mounting said base to a support or an electrical box;a movable ring slidably received in said axial passage of said base, said movable ring having a top end with a mounting flange for supporting an electrical wiring device, said top end further having an outwardly extending support flange for contacting an outer surface of a wall and supporting said movable ring, said movable ring having a coupling tab with a screw hole and extending inwardly and aligned with said coupling tab of said base; anda coupling screw extending between said coupling tab of said base and said coupling tab on said movable ring, said screw adapted for retracting said movable ring into said base to clamp said support flange into contact with the outer surface of the wall. 24. The electrical box extension of claim 23, wherein said coupling tab on said base extends inwardly from said bottom end of said base, and where said coupling tab has a threaded screw hole for receiving said coupling screw. 25. The electrical box extension of claim 24, wherein said screw hole in said coupling tab on said movable ring has a dimension to allow said coupling screw to slide through, whereby said movable ring is slidable with respect to said base. 26. The electrical box extension of claim 23, wherein said support flange on said movable ring is removably coupled to said movable ring. 27. The electrical box extension of claim 26, wherein said support flange is movable between a retracted position within said movable ring and an extended position to extend outwardly from said movable ring. 28. The electrical box extension of claim 27, wherein said support flange is pivotally coupled to said movable ring to pivot between said retracted position and said extended position. 29. The electrical box extension of claim 27, wherein said support flange is pivotally coupled to said top end of said movable ring and has a stop member to contact an inner surface of said movable ring to limit outward movement of said support flange. 30. The electrical box extension of claim 29, wherein said support flange includes a plurality of openings aligned with openings in said mounting tabs for supporting the electrical wiring device. 31. The electrical box extension of claim 23, wherein an extension ring is coupled to the top end of said movable ring to increase the axial length of said movable ring. 32. The electrical box extension of claim 31, wherein said extension ring has a bottom end with a coupling tab with a screw hole for receiving a screw to couple said extension ring to said movable ring. 33. The electrical box extension of claim 32, wherein said extension ring has a top end with a mounting flange adapted for supporting the electrical wiring device. 34. The electrical box extension of claim 33, wherein said support flange is coupled to said top end of said extension ring.