Six years on, Kevin returns to Scotland to see Colin and Marta's incredible metal home, inspired by aircraft hangars, now that the construction is finally finished.

Edward and Hazel plan a shining white art deco lighthouse on a rugged beautiful clifftop. But almost immediately their wildly optimistic plan runs into trouble.

After recovering from leukaemia, Toby is driven to build a complex home around an old oak tree. But can he balance high architecture and health with a comfy family place?

Richard and Felicia almost singlehandedly turn an underground water reservoir in the Humber Estuary into a family home. It's an epic task. And then a life threatening illness strikes.

Design engineer Mark Butler is paralysed from the waist down and needs a cutting-edge, wheelchair-friendly family home. Making it for £600k proves a huge emotional strain.

Paul and Amy Wilkinson plan to build a lakeside home in Lincolnshire with five circular timber buildings linked by walkways. But Paul's health suffers as he struggles to finish in a year.

Andy and Jeanette plan a precarious cliff-top build on the west coast of Scotland. There are battles with extreme weather, budget overruns, and a sudden emotional shock.