Double Your House for Half the Money

Hertfordshire and Clapham (2x9)

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In St Ippolyts in Hertfordshire, Sarah meets Ben and his French housewife Alex and the couple's six children. The family want to turn their tiny three bedroom home into a stylish six bedder, but on a very tight budget. In Clapham, south London, Stephen and Tara are feeling the squeeze and want to dig out their basement. But once digging commences the costs start to spiral.