The Dengineers build 11-year-old Ben a camouflaged adventure bunker.
Sibling rockers Sami, 9, and Nadia, 12, need their own soundproofed rehearsal room.
A massive Manchester United fan, 10-year-old Billy is in need of a football den.
Ella wants a den to escape the 35 bikes that are kept in every room of the house.
Jazz and Katelyn love dancing and want to put a dance studio in Jazz's mum's cellar.
Eleven-year-old Nathan wants a kitchen hangout, where he can practise being a chef.
Nyobi needs room, a desk space and art materials, for her design projects.
Ten-year-old Ben wants a den with enough room for his beloved train set.
Sienna really needs a new bedroom which can double up as a spy den, with lots of gadgets.
The pupils of the Lancasterian School want an exciting space that everyone can hang out in.