Mark and Lauren get the help of experts to design dream dens for children. Nine-year-old Rufus loves climbing and playing, but he isn't always able to join his friends when they are out having fun. Rufus has leukemia and regularly has to go to hospital for treatment and check-ups, meaning he often misses out on the adventures he loves. The experts bring the adventure to him by giving him his very own adventure den.

Mark and Lauren get the help of experts to design dream dens for children. Eleven-year-old Joshua and his younger brother Owen are great friends but Owen has Down's syndrome which means that a lot of his parents' time is taken up looking after him. Joshua loves DJ'ing and particularly Radio 1's Annie Mac. We're going to build Joshua his very own DJ den.

Mark and Lauren get the help of experts to design dream dens for children. Whitney, 11, is a recycling queen and she hates litter droppers. So much so that when she and her family go out they take a bin bag because Whitney can't help picking up litter whenever she sees it. To answer all her eco needs we're building Whitney her very own eco den!