Charlie Dimmock and the Rich brothers are in Bexley, Kent to visit a couple with two growing sons. As the boys get bigger, they're feeling the squeeze in the house so are keen to transform a disused area at the bottom of the garden into a new multi-functional space that they can all enjoy. The centrepiece of this space needs to be a cabin that will be an extension to their home, but they would also like a contemporary outdoor space around it. With the cabin eating up the majority of the budget, the designers have their work cut out.