Caroline Di Costa Architect Architects Caroline Di Costa Architect Caroline Di Costa Architect projects featured on Lunchbox Architect Casa 31_4 Room House by Caroline Di Costa Architect Casa 31_4 Room House: Australia's Most Livable Coolgardie Safe Casa 31_4 Room House is a Coolgardie Safe for living. But it also uses the layering of history to transition a traditional house into a vibrant modern home.