These external Woodstone® Swift boxes are an ideal alternative nesting location for swifts that can be mounted on the external surface of a building. This makes them excellent for retrofitting onto existing buildings where there is a need to increase biodiversity. The Woodstone® box is extremely hard-wearing and will give years of service without degrading. It has a sloping roof to help deflect rain and options for either a bottom or front entrance which allow you to tailor the type of box to the scenario in which it is being installed.