(Money Magazine) -- Less than a year after moving into her new 2,100-square-foot house in Lenexa, Kans., Susan Sabin has strung up lemon lights in her front window. The lemons, she says, go perfectly with the home's most prominent features: jammed doors, warped windows, bent pipes and cracked walls. "The house is essentially splitting in two," says Sabin. Where to go for help If you're buying or fear a problem: These consumer groups post advice for buyers, news about home builders and the latest on construction materials: HomeOwners for Better Building (hobb.org) and Homeowners Against Deficient Dwellings (hadd.com). If you...