Cath and Rob and their three children have outgrown their ex-council house in Warwick. Their chaotic ground floor is a series of dark and miserable rooms, while upstairs they have three cramped bedrooms. Unable to move, they are planning a typical two-storey extension. Piers's suggestion is to ditch their ambitious extension and instead build a simpler one. Karen and David are desperate to fall in love with their home in Ipswich, but it's hard. Karen loves baking but her kitchen is so small she makes cakes in the cellar, and meanwhile David wants a space he can work from home in.