Daren Howarth and partner Adi Nortje live in Brighton, and are champions of sustainable living. They want to build an earth-sheltered home from recycled materials, based on ideas pioneered in the 1970s in New Mexico. But land prices and planning laws have forced them out of England, across the Channel to Brittany, in France.

Mimi D'Costa and her husband Andre have moved to the Kent countryside to bring up their two boys. They have bought a large plot of land and want to build a home on it that is functional enough to serve their young family, but that will also blend beautifully into the landscape.