To add an AC outlet, for example, you just drill a circular hole in the wall, tap into the wiring, add the outlet and you're set. If you don't want it, pull it out and plaster over it with more earth to seal the hole.
She was scrubbing furiously at a line of grease spots which led from the stove towards the door to the dining-room. That was where Henry had held the platter tilted as he carried the steak in yesterday. And yet if she had warned him once about that, she had a thousand times!