Jonnie Irwin joins homeowners Catherine and Michael from Brighton, as they begin a project that's been over 4 years in the planning. But converting the loft space of an old power station throws up its own challenges.

Jonnie Irwin joins homeowners Martin and Emma in Yorkshire, as they convert their basement, to transform a house that's been in Emma's family for three generations, into the perfect family home.

Jonnie Irwin joins homeowners Steve and Amy from Cardiff, as they struggle to convert their retirement style bungalow into a contemporary living space.

Alistair and Louise from West London attempt to right the wrongs of the past, and convert their botched basement into the ultimate living space. But with no prior experience, they're placing all their trust in the hands of their builders.

Jon and Lauren attempt to transform their loft into a luxurious master en-suite. But with only weeks to complete the project, the pressure is well and truly on the builders.