Season 13 opens in Boston, where an 1850s-era Greek Revival house is to be upgraded. The homeowner would like to improve the kitchen and the third floor, where the master suite is located. The retaining walls also need work. In the second half: rust staining; the installation of a pass-through in a load-bearing wall; and the replacement of a poorly built fence gate. Also: NASA astronaut Rick Mastracchio joins the fun when the guys play "What is it?"