What to Expect: Two new projects, both in the Boston area, mark the show’s 30th anniversary season. The first, in the suburb of Newton Centre, updates a 1915 Dutch Colonial, making it more suitable for a family of four on a limited budget. In the second, the crew takes to the rough urban neighborhood of Roxbury to renovate a vacant, foreclosed 1870s-era Second Empire house, dividing it into two units for two low-income families to take ownership of.