Hall County officials are expanding the target area of a federally funded housing rehabilitation program to increase the supply of affordable homes for low-income families in unincorporated communities, including in the northern and western parts of the county. The move comes as local government, business and nonprofit leaders acknowledge the deteriorating conditions of homes in the area and rising costs for renters and homeowners, which presents public safety, educational and economic consequences. For example, about 1 in 4 homeowners in Hall County are cost-burdened, paying more than 30 percent of their household income toward housing.