Zack Dettmore and builder Jared Ruggieri install vinyl siding with trim details designed to give it a more traditional look.

Later, Zack tours a Pennsylvania factory to follow a modular Accessory Dwelling Unit from floor framing and rough mechanicals through finishing and shipment, before it is delivered and craned into place in Massachusetts.

Back at the Walpole project, Richard Trethewey meets with plumber Bob Connolly, who explains how recessed ceiling cassette heat-pump units can heat and cool the basement without lowering the ceiling.

Meanwhile, Kevin O’Connor and Zack join builder Kevin Smith and homeowner Dan to install a large three-panel sliding glass door that opens the house to the backyard.

Original Air Date: May 7, 2026, Season 47; Ep. 23 23:42

Products and Resources

• Contractors: LDS Construction
• Plumbing: RGC Plumbing
• Side trips:
  Modular Building Systems Of PA
  Backyard ADUs