How to Extend a Wall Electrical Outlet
Sometimes an electrical outlet is positioned in such a way that it does not work for your needs. Maybe an appliance or an electrical component that cannot be moved won’t quite reach the outlet. Or, your house contains floor electrical outlets that you wish were higher up a wall. Whatever the problem you are facing, there are ways to solve it. Extending a wall electrical outlet is not the same as simply plugging a power strip or a multi-outlet unit into an existing plug. That is certainly one option, but you can also physically extend the outlet, without cutting a long hole in the paint, plaster, and drywall.
Step 1 - Prepare to Start
At the main circuit panel, shut off the power to the outlet. That may mean you have to shut off power to an entire room, but it is for safety. Then, with a screwdriver, remove the faceplate of the outlet you wish to extend.
Step 2 - Add the Extension Wiring
The outlet extension kit should contain a cable with three wires: white, black, and bare copper. Strip back several inches of the cable's jacket to expose the wires. On the existing outlet, there should be a silver screw and a gold screw, and a green grounding screw, and on the existing electrical box there should be a ground screw at the bottom of the box. First, attach the exposed white wire to the silver screw then the black wire to the gold screw, making sure that they are securely fastened. Lastly, attach the bare copper wire to the box's ground screw and the receptacle's green screw.
Step 3 - Run the New Wiring to the Extended Location
Run the new cable to the new location making sure to leave enough slack to comfortably wire the new outlet.
Step 4 - Secure the Faceplate Over the Existing Outlet
The existing outlet will need a new faceplate to accommodate the new wiring. An outlet extension kit should contain most of the pieces for the faceplate; otherwise, you might need to purchase one separately. Make sure it can properly be screwed into the wall while at the same time allowing for the new wiring to lead out of it.
Step 5 - Install Electrical Outlet
The new electrical outlet will not be inside the wall. Instead, it will be attached to the outside. Affix an exterior metal plate to the wall with screws. To this you will attach the exterior wire box, but before you do, run the three wires-in-one into the new wire box, connecting them in the same order as before: white to silver, black to gold, and copper to green.
Step 6 - Affix the New Outlet and Faceplate
Once the new outlet is wired, secure it inside the already-secured wire box, carefully tucking the new wiring inside. Attach the faceplate to the new wire box; then, using tacks or large staples, or preferably screwed in plastic clamps, fasten the extension wire to the wall or baseboard, making sure it cannot be easily tugged free.
Return the circuit breaker for the outlet or room to the ON position and test the extended outlet to make sure it works properly.
As long as you are satisfied with having an extended outlet outside of the wall, this is an easy method to install one. Your other option is to tear into the wall and extend the outlet through the studs to create another in-wall outlet.