Former engineer Andy Stakes and his partner, Jeanette Hardy, build a new house right on top of a sheer cliff in Scotland. But after batting winds and rain, will a last-minute design change ruin everything they've worked for?

Paul and Amy Wilkinson build a lakeside home in Lincolnshire made up of five circular timber buildings. But Paul's health suffers as he struggles to get this complicated build finished in just 12 months.

Design engineer Mark Butler is paralysed from the waist down. Along with wife Penny, he builds a cutting-edge new wheelchair-friendly family home in Warwickshire with full accessibility built into its fabric.

Engineer Richard Bennett and partner Felicia Böhm transform an underground water reservoir in the Humber Estuary into a family home. It proves to be an epic task to demolish the concrete roof and grind the reservoir walls.

After recovering from leukaemia, musician Toby Leeming is driven to build five interlinked barn structures in a horseshoe around an old oak tree in Suffolk. But can he balance high architecture ambitions?

Edward and Hazel Short build a white art deco lighthouse, with additional bedroom wing and infinity pool, all on a rugged but beautiful clifftop spot in North Devon. But their wildly optimistic plan runs into trouble. (Final)