Kettuvallam is a house boat widely used in Kerala. These have thatched roof covers over wooden hulls. In the Malayalam language "kettu" means "to tie" and "vallam" means boat - the two together make the local name "kettuvallam". Each houseboat is constructed using the ancient principles and techniques of boat building by the local carpenters using 'Anjili' wood.
Coir ropes are used for tightening the wooden planks together. A kettuvallam is about100 feet in length and has a width of around 13 feet in the middle. The materials that go into the making are local and ecofriendly; bamboo poles, coconut fibre, ropes, bamboo mats, carpets etc.