North London

Recently widowed 82-year-old Kathryn plans to build a new, accessible, ultra-sustainable home right next door to the home she lived in with her husband Jon, 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, when far deeper than anticipated foundations have to be removed, horrendously wet weather causes problems and unexpected costs arise.