Tinie Tempah follows more brave homeowners as they build extraordinary extensions. In Warwickshire, he follows a couple taking on a million-pound retirement project of adding an underground swimming pool and spa extension to their curved mega-home. However, they face a battle with the property's curves and to somehow make it eco-friendly. On the lookout for inspiration, Tinie also visits two other super-luxe subterranean extensions devoted entirely to lives of leisure.

In Lincolnshire, Tinie Tempah follows a couple of serial property flippers who are about to finally settle down in the modern country home of their dreams, but not before they add three massive extensions. Later, in Hertfordshire, he meets a newly qualified architect who is building an extension for his first clients - his fiancée and their blended family.