This Sand Bag Building System that makes use of a timber ladder frame was first developed for new Staff housing at Twinstreams Environmental Centre in Mtunzini on the northern coast of Kwa-Zulu Natal. The project was completed in 2004. This project and it’s innovative building system went on to win the Africa Sustainable Building Best Practice Award for residential projects in 2004. In response to using the only locally available materials at hand, sand and timber, a new building system was developed for the project that could largely involve the local unskilled labour force.