I have an electrical outlet in the back of a cubby hole over my fireplace as it seemed built for televisions of the CRT variety.
My question is, I plan to just wall off that cubby as to be able to hang a flat screen television on said wall. In doing so, how do I move the electrical outlet forward, from its current position, to the new wall?
If there is enough slack in the existing wire then you should pull it out up to the new outlet box.
If that's not possible then you can leave an access panel through which you can reach the old box and pigtail a short run of wire. Junction boxes must all be accessible using a screwdriver.
If you don't want to leave an access panel you can use correctly rated inline splices.
