Colin Lewis, former ceo of Avant Homes, has joined Piper Homes, a Midlands-based housebuilder, as non-executive chairman. Lewis, a lawyer by trade, left the Northern-based Avant Homes last Spring following the sale of the housebuilder to Yorkshire-based developer Berkeley DeVeer. He served seven years as ceo, staying with the company for 11 years in total. He now brings more than …