1. Lack of curb appeal You've driven by the front of your house so many times that you barely take notice. And unfortunately, once you decide to sell, most of your focus will be on the interior, not the exterior. Huge mistake, according to Cindi Hagley, broker/division manager with The Hagley Group in Pleasanton, California. "I've had buyers in my car, when we drive up to a house, who don't even want to go in because of how crappy it looks.