1. Brighton

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.

2. Ilkley

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.

3. Cardiff

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

4. Hammersmith

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.

5. Essex

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.

6. Wandsworth

Richard and Harriet embark on an ambitious project to convert their basement. But digging underneath the foundations of their property is a risky business, and as plans change, budgets begin to escalate.

8. Sheffield

Jonnie Irwin joins homeowners Alison and Howard from Sheffield, as they sink their life savings into their planned basement conversion. But with so much at stake, will their project match up to expectations?

9. Greenwich

Jonnie Irwin joins homeowners Marko and Vanda from Greenwich, South London, as they race to convert their loft before the arrival of their new baby girl.

10. Cheshire

Jonnie Irwin joins homeowners Sarah and Simon in Cheshire, as they embark on a long held ambition to convert their basement, to create the ultimate children's playroom, and gym.

11. Enfield

Andy and Carole embark on a project to supersize their house by digging down into the ground, and extending up into the loft. But with torrential downpours, cracks, and collapses, it proves to be a very testing project.

12. Castleford

Jonnie Irwin joins homeowners Philip and Andrea from Leeds, as they embark on the biggest renovation project of their lives.

13. Sheffield

Jonnie Irwin joins homeowners Martyn and Mai-Mai from Sheffield, as they take on their first ever renovation project.

14. Twickenham

Alan and Louisa from Twickenham want to gut the end of their terrace house, and extend up into the loft, to create a proper family home. But as costs spiral, will it be everything they expected when they first started their project?

15. Cheshire

Jonnie Irwin joins John and Liz from Altrincham, as they sink their savings into the ground, in a bid to realise the hidden potential underneath their house.