Kevin McCloud meets Rosa and her partner Craig who are turninga century-old, family-owned, decommissioned steam railwayreservoir into a home. Their radical plan to reinvent thereservoir into a unique living space involves punching hugeholes through the walls to allow light to flood in, amezzanine with views across the valley and a concrete extensionwith four bedrooms. Along the way they encounter a pandemic,numerous money crises, pregnancy and a schedule that growsfrom 12 months to over three years, is it worth it for Rosa tohave the reservoir home she has dreamt of since childhood?