A new booklet has just been published with support from NPWS ‘Building nest boxes for the Swift into cement block, brick and externally insulated walls – guidance on best practice’ by Lynda Huxley – November 2021. Hard copies available on request if you email swiftconservationireland@gmail.com https://www.swiftconservation.ie/wp-content/uploads/2021/12/Booklet-Building-Next-Boxes-into-Walls-PDF.pdf