Kevin McCloud meets Kate and Rob, who have lived in a 1940s prefab house built by Rob's grandfather. Originally designed to be lived in for just 10 years, this factory-built home is well past its sell-by date. Now, Kate and Rob are at last in a position to replace it with a bespoke, modern, warm home - which will also be built in a factory using volumetric modular construction. Over just six weeks, their new house will be manufactured on a production line, complete with insulation, tiling and kitchen installation.