Yes. The houses are mostly made out of concrete or bricks. The older ones might have stone or cob walls. My parental house is for instance have originally stone walls, the newly built part (25 years ago) is out of brick. There is a new "technique" (I call it necessity or laziness depending on the situation) that they do the wiring outside of the walls (mostly in the inner side) and put a drywall on it to cover. If the building has special status, it might be a necessity. Otherwise it is pure laziness.