Luxury mansions are undergoing a facelift. New construction technology and cutting edge techniques have opened the door to custom designed and eco efficient super-sized houses being built in super-quick time. Narrated by architect Charlie Luxton, this documentary looks at three unique prefabricated builds and meets the people who call these incredible structures home. Pizza restaurant entrepreneurs Richard and Nikki Cooper are building a 5000-square-foot dream home in just four days. David and Lesley Lennox's strict deadline for their daughter's wedding puts massive pressure on their build. And a risky cliff top plot means that Paul Cook's dream house teeters on the edge of completion.