Grand Designs host Kevin McCloud is back with more extraordinary architecture as he follows the emotional highs and lows of the brave men and women who are risking it all to build the home of their dreams.

Kevin McCloud returns to East Sussex where concrete fanatic Adrian and wife Megan's cutting-edge concrete bunker is now complete. Is this raw, exposed concrete home really the ultimate 21st century country house?

On a Scottish country estate architect Lain and his wife Jenny build an enormous new black, square building inside a beautiful old walled garden, connecting it right through the high garden wall into a dilapidated gardeners' bothy on the other side.

Ex-advertising man Geoff builds a dramatically cantilevered house on a flood plain in Essex. It's one of the challenges of his life: a flood resistant architectural marvel on the coast, designed to survive a one in a thousand-year flood event.

Bereaved Gretta returns from Malaysia to build a single-story, burnt wood and glass pavilion on the land of her sister Mary and brother-in-law Fernando. Also designed by her nephew Carlos, it's a real family affair, a story of recovery and renewal.