The Grand Designs presenter travels to the foothills of the Andes in Chile to meet a family of five from south London who quit the daily grind to build a new home in the shadow of an active volcano. Kevin arrives at the site on horseback to discover that Jago and Lucy are still in the process of constructing their new home using bags filled with soil and timber from the local forest, which they transport by oxen. He is impressed by the structure, but troubled by one key question. Why choose to live next door to a highly volatile volcano?