Landscape contractor Roger Cook starts by transplanting the shrubs and plants from the front of the house to a place where they can be "heeled in" for safe keeping until the job is complete. Homeowner Joe Titlow shows host Kevin O'Connor how his company builds highly detailed architectural models (and a whole host of other useful items) by printing them with a 3-D printer. Then, Roger gets to work clearing the small trees and overgrowth that are in the way of the new family room addition. Near the oldest part of the house, Kevin and master carpenter Norm Abram dig in by removing the front entry porch and the accessibility ramp. Then, in accordance with the new EPA lead paint laws, they set up to begin removing the peeling and rotted clapboards. Out back, general contractor Tom Silva shows Kevin how he's laying out for the new addition, and excavation begins. As expected, water is discovered, and Roger gets to work setting up a drain and sump pump system to deal with it. Mason Mark McCullough arrives to demo the exterior parts of the 1970s-era chimney that are in the way of the new addition. In the second half of the hour, on ASK THIS OLD HOUSE, plumbing and heating expert Richard Trethewey helps a homeowner repair her faulty shower valve. Then, Tom helps a homeowner rebuild her wobbly stair banister.