Homeowner Chris Flynn shows master carpenter Norm Abram how she is making do with the makeshift bathroom on the third floor. General contractor Tom Silva offers Chris reasons why she needs to replace her old basement windows, and host Kevin O'Connor lends a hand installing them in the existing jambs. In the basement, as an alternative to using direct vent oil appliances, plumbing and heating expert Richard Trethewey shows Norm the new stainless steel double wall chimney that will be used to vent the heating equipment. On the other side of town, Kevin meets developer David DuBois to see how he fulfilled an urban fantasy by renovating an 1865 East Boston firehouse into an over-the-top dream home. Tom shows homeowner Liz Bagley how he'll insulate behind her existing walls using familiar spray foam insulation, but this time it will be poured into the wall cavity through a series of small holes, so as not to disturb the old plaster.