George meets Sam, a conservation worker from Somerset who suffers from spinal muscular atrophy and is 30 years old. George is determined to change Sam's life by designing a fully accessible mobile home, allowing him to move freely inside as well as taking it on the road to travel the country. In Derbyshire, George meets James, a former pub landlord, who's building his new girlfriend a surprise house warming gift - a pub in their back garden. In New Zealand, George's travels to the island of Waiheke to see a modernist tent. And George and Will look for engineering inspiration for their futuristic rotating home.

George meets farmers Ali and Rich, who hope to salvage one of the rarest and - for its time - one of the most expensive caravans in the world: a 1950s Warwick Knight, complete with spiral staircase and roof garden. In Devon, fireman Nick wants to build a garden studio apartment for his mother-in-law out of an old dog house. George's New Zealand visit continues with a trip to a fold-out beach hut. And Will and George discover that an electric wheelchair could provide the engineering breakthrough they need to rotate their futuristic home.