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!

The team build 11-year-old Phillip his own den where he can build model planes.

Eleanor, 10, loves books, so the team bring the library to her - a magical library!