The Dengineers

Eleven-year-old Ben loves all things outdoors so a camouflaged adventure bunker complete with a bug kitchen and secret entrance would be the perfect way to make new friends.

Sibling rockers Sami and Nadia are constantly making noise. The only thing they agree on - is the need for their own soundproofed rehearsal room. A massive music amp in the corner of the garden could provide the perfect solution.

Due to an undiagnosed illness Billy missed out on football training for years. A massive Manchester United fan he needs a purpose-built football den to help get him back up to speed.

With bikes being kept in every room in the house - including her bedroom Ella's dream den is a Hawaiian beach hut where she can escape.

Best friends Jazz and Katelyn love dancing and want to put a dance studio in Jazz's mum's cellar.

Eleven-year-old Nathan wants to be a chef and is after a kitchen hangout where he has space to practise his own culinary creations.

Nyobi needs more room a proper desk space and better materials to work on her art and design projects.

Ten-year-old Ben is desperate for a den with enough space for his beloved train set.

Sienna really needs a new bedroom which can double up as a spy den with lots of techy gadgets inside her top-secret lair!

The pupils of the Lancasterian School all with complex medical conditions need an exciting wheelchair-accessible outside space.

Presenters Mark and Lauren look back at all the dens they built and reminisce about the great kids they encountered.