Double Your House for Half the Money

Swindon and St Albans (2x6)

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Sarah meets scientist Jo and computer engineer Keith Mortimer In Swindon, Wiltshire. The couple have grand plans to more than double the size of their four bed 1930s house with a two storey wraparound extension. In St Albans, Hertfordshire, Sarah meets Mei and Yui Tse, who are planning their home's second expansion in four years.