The Wai House (water house in Maori) is a sustainable house located in New Zealand that collects and uses water in a sustainable way. The house is made of sustainable materials such as cedar wood for the outside and concrete with recycled plastic instead of sand for the inside. It is suitable for two young couples who are willing to leave the traditional living standards and transfer to a smaller, yet spacious tiny house. The Wai house will take care of you and the environment at the same time. Water is vital, and the Wai house knows it.