Series 4

Suffolk boatyard specialists Mary and Simon's dream is a futuristic aquatic pod. They're experts in their aquatic field, but have they taken on more than they can handle?

Alan and Val have put their savings on the line for a high-tech boat as a unique way to keep up with the family. But first they need to learn how to live on the water.

Seasoned floating homeowners Pat and Sue Willan are planning to spend their retirement on a huge, state-of-the-art Dutch barge. But will their expensive tastes sink the project?

In Surrey, Linda and Mark need an upgrade on their cramped floating home and Linda's doing it by herself. Is enthusiasm and passion enough to get the job done?

In Kent, metal worker John tackles a cut-price riverboat restoration using various ingenious workarounds. Can he make a home of his own and finally fly the nest?

After 25 years living in New Zealand, Keith and Pam dream of touring the UK's waterways. But it's their first boat and they'll need to learn the ropes quickly.

A German couple want to live closer to nature. They build a novel high-tech caravan that floats on water. But will their radical design work?

Londoners Lily and Natasha have bought a decrepit narrowboat at a knock-down price. Will their DIY enthusiasm override their lack of knowledge and experience?