With 75 percent of the new prefabricated house being built in a workshop, host Kevin O'Connor opens the show at Bensonwood in New Hampshire, where today it's all hands on deck. General contractor Tom Silva meets up with builder Tedd Benson to see how his crew prefabricates interior and exterior wall systems, while next door in the timberframe shop, job captain Mark Roentsch shows master carpenter Norm Abram the assembly of salvaged Douglas fir and live oak timbers that will frame the dining area. Master electrician Allen Gallant works inside with the Bensonwood crew to pre-wire the building with a new plug and play wiring system, while security system contractor Greg Smizer preinstalls chases and wiring for alarm and data cables. Once in Weston, work on site will be a matter of connecting the wires and getting inspections. At the end of the day, Kevin and Tedd load up the first truck for delivery to Weston, getting ready for the dramatic "house raising" that will take place over the next 3 weeks. In the second half of the Hour, on Ask This Old House, landscape contractor Roger Cook helps two homeowners undo the damage done to their lawn from a new well that they recently installed. Then, Tom shows a homeowner how to make a piece of curved stair molding with some red oak and a few simple power tools.