North London

The new run of the iconic property show continues. Kevin McCloud follows more of Britain's most ambitious self-building projects, as intrepid individuals attempt to design and construct the home of their dreams. Kathryn and her husband Jon lived happily in a four-bed Edwardian home on the same street in north London for 60 years. But now, at 82 and recently widowed, Kathryn faced an all too familiar dilemma: struggle on in a home where getting up the stairs was becoming increasingly difficult, or move away from the street that she's loved for so long. Until she came up with an audacious plan, with the help of her architect, James Mak, to build a new, accessible, ultra-sustainable home right next door, where a garage and extension currently sit. It'll be a mirror image of her current Edwardian house, but with a 21st-century twist. Pulling off this daring feat proves difficult right from the off, when far deeper than anticipated foundations have to be removed to make way for Kathryn's new home. Horrendously wet weather, spiralling costs - including eye-watering fees to connect to basic services - and the worry of selling her old house in time all test Kathryn's nerve as well as her budget. Only time will tell whether this late-in-life gamble will pay off...