Justin plans to restore a neo-Gothic cemetery keeper's lodge and convert its toilet block into a luxury extension complete with a moat and swimming pool. But can he keep his budget under control?

Kevin McCloud meets Greg and Georgie who are taking on the highly ambitious task of converting a dilapidated, 35-year-old barn in Kent. The build will be a huge challenge involving the painstaking conservation of the existing rotten structure, building a new two-storey internal steel frame and recycling everything they can to stretch their £250,000 budget.

Nathan and Amye are building a cathedral-like home modelled on local Dutch barn houses with a sleek twist and a 5000-tile armadillo roof. But the pressure mounts for project manager Nathan.

Energy conservationist Andrew plans to build a radical, self-heating home by storing the warmth of the summer sun into insulated earth banks. But will this gigantic thermal experiment work?

Kevin McCloud revisits Adrian and Megan, whose dream home in East Sussex became a nightmare. With the house now fully complete, what is living in a cutting-edge concrete bunker really like?