Kevin McCloud looks at the transformation of a derelict mill cottage in Northumberland into a contemporary family home, the longest-running project ever featured on the programme. Stefan Lepkowski and Annia Shabowska began work in 2006, and their ambitious plans involved restoring the Georgian building, reconstructing a watermill and adding a steel-and-glass atrium, but their budget of £250,000 was completely inadequate.

Kevin McCloud meets Tim and Philomena O'Donovan, who are trying to convert a lifeboat station in Tenby, Pembrokeshire, into a contemporary home and preserve the historic building for posterity. A weather-worn, rusting and rotting hulk that was never designed for habitation, it is perched on a steel pier 40ft above the sea and can only be reached by crossing the sandy beach at low tide.