We do not like to cut and paste other peoples work on this site unless we have permission and thus give credit for their work so until we can get some various bat boxes made ourselves then please visit any of the bat conservation charities who will probably have plans available for you to copy. One such site is here. It is important not to use preservatives of any kind especially if you are using scrap wood as these can be made again when they drop apart in future years and in any case many preservatives will kill bats in a very painfull way. If you do use these plans why not make an online donation to the trust to say thank you ( top left corner of menu).