Valentin Martin and Daria Cabai run their own naval architecture company in London. Their dream is to escape their cramped apartment with their young son Yves and instead live on the Thames in their own floating home. They create their own design, converting a century-old barge into a three-tiered contemporary floating apartment. The commission is given to a specialist boat building company in the Netherlands, a country that knows a thing or two about living on the water. The biggest challenge is moving Valentin and Daria's finished new home back to London. The renovated barge must travel 290 miles across the North Sea - and some of the busiest shipping lanes in the world. After a hair-raising journey they finally make it back to England, where their eye-catching floating apartment becomes a new attraction next to Tower Bridge.

London-based Karen Boswell decides to design and build a stylish houseboat to moor near the Grand Union Canal. She's gone to town on her modern industrial bathroom design, indulging in a set of twin showers as well as a bath. But space becomes a problem for the build team, who are tasked with constructing Karen's rather large bed. In Portland, Oregon, fed up with her cramped city apartment, Marsha Olson sets out to build a spacious two-storey floating home on the idyllic Multnomah Channel. Will the dramatic 10-month build prove worth the effort?