House Martins build nests from mud on the eaves of buildings, often in multiple colonies. With changes in house design and construction suitable nest sites have unfortunately dramatically declined.
By providing an artificial nest habitat you are offering an excellent alternative for the house martins and encourage other birds to nest nearby. These WoodStone House Martin Nests have been specially designed to appeal to house martins and are constructed from WoodStone, a mixture of wood fibres and concrete that is durable and provides great thermal properties for the occupants. The backing to the nests is also WoodStone, making them very durable.