You will need to check if the existing wires are long enough to go onto the other side of the wall.

Did that in my previous house reno. It involved the relocation of the meter together with the DB about 12 ft away from its original location. At that time, I had a cornice and it helped to hide all the wires. It is going to require some wire rerouting works. Just make sure you get a reliable electrician to carry out the work. All wire joints (if require) should be properly joined and insulated. You don't want to risk a short circuit and fire.

That was renovation on my previous house. Sorry, cannot remember the cost.