The crew visits Coloma, California, where the Gold Rush began in 1848, to see Sutter's Mill and try their hands at panning for pay dirt. At the house, a break in the rainy weather means the crew can put up the new redwood siding, while inside Richard Trethewey helps plumber Jeff Deehan retrofit a vintage lavatory with a modern mixing faucet. Homeowner Laurie Ann Bishop shows us the transforing effect of the new windows in the chapel, and an energy consultant demonstrates their heat-retaining capabilities with a thermographic camera. In the basement, Richard discusses the new heating plant (a combination boiler and hot water tank) and the manifold system that will control the building's radiant floor heat. Our host accepts delivery of the church's custom exterior doors, and a cleverly disguised garage is installed.