Georgia and John and their three small kids are feeling cramped in their current home. Georgia is tired of the impractical layout of their house and wants to replace the pool with a sizeable backyard. John thinks by increasing the floor plan of their Queenslander the solution is underneath their current living space.

Tracey and Antony bought their 4 bed detached home 10 years ago; Tracey likes gardening and taking in the beautiful view from the front of the property, but Antony loves all things new and is ready for change.