Every year, thousands of homeowners call in the builders, trusting their most valuable asset to a stranger. For a long time, native builders seemed to have a monopoly on home improvements. But in the past five years, a new breed of builder has reached our shores and that of Britain's from Eastern Europe - particularly from Poland. This Cutting Edge film follows two teams - one British, one Polish - as they each construct an extension on two average suburban houses. How will they measure up?