They can be much worse in places near undeveloped land. Or in your case since they've newly appeared, expanding development nearby may be pushing them in your direction. You may have already done so, but just in case, check into the industrial strength insect/scorpion poison (they sell some stuff on Amazon that they probably shouldn't) and douse the perimeter of your house in it a couple of times a year. Also, google up scorpion-proofing your exterior. They're crafty, so you probably can't stop them all, but you can stem the tide with some effort. Things like mesh over any opening, caulk/foam on any seams/cracks, keeping branches or anything climbable away from the house, a few inches of plexi along your foundation to make it hard to climb, etc.
