How to Gang Electrical Boxes

Trade vernacular can at times be confusing to homeowners.

A single switch box, for example, is also known as a single-gang box. Two switches or outlets in one box is a double-gang box and so on. Multiple-gang boxes designed for a determined amount of switches or outlets are usually installed in new construction prior to wall installation. However, when working with existing walls, a convertible type of steel box that can be added onto is needed. You can "gang" an electrical box working with only a screwdriver.

Determine the number of additional switches or outlets that need to gang together in the electrical box.

Remove the side-plate retaining screw on the bottom left-hand side of the electrical box. This screw can also be on the top right depending on how the box is held. Turn the screw counterclockwise with the appropriate tip screwdriver and remove it from the mounting bracket.

Remove the side plate of the box by pulling the plate tongue out from the slot, located at the opposite end of the retaining screw mount.

Remove the side plate of the box that is to be joined to the first box in the same manner outlined in steps 2 and 3.

Attach the add-on box by inserting the tongue end of the box into the slot of the first box.

Install the retaining screw in the mounting bracket. Tighten clockwise with the screwdriver.

Things You Will Need

  • Flat-tip screwdriver
  • Phillips screwdriver


  • Gang as many additional boxes as are needed.

About the Author

Max Stout began writing in 2000 and started focusing primarily on non-fiction articles in 2008. Now retired, Stout writes technical articles with a focus on home improvement and maintenance. Previously, he has worked in the vocational trades such as automotive, home construction, residential plumbing and electric, and industrial wire and cable. Max also earned a degree of biblical metaphysician from Trinity Seminars Ministry Academy.